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Hey everyone ! I recently got an extended battery for my Sensation for around $90 as it was much needed to meet my usage !
I thought I would share the feedback with you guys !
Mugen Power is a 3rd party battery manufacturer, and is known for it's "extended" batteries. If you’re an owner of a high end Android phone you too are probably facing a very poor power backup with the stock batteries and that’s where extended batteries come into play.
Basically, Mugen promises something near double battery life with this extended battery life, let's see how this extended battery fairs.
Unboxing
This battery comes in a very small, compact and simple backing - it has a leaflet with the instructions and standard warnings, a back door and the extended battery itself.
Look and Feel
We already know the HTC Sensation is not a very thin device in itself, and by adding the Mugenextended battery and the battery door, it does get noticibly thick - but for double battery life which it promises, the thickness can be bared - at least for me !
One would think that this battery adds a significant ammount of weight to the phone, but on the contrary it does not add any weight which can be significantly felt.
It's also nice to know that the backdoor cover fits perfectly on to the Sensation, and the feel of the replacement cover is not different from the stock one
However, with the extended battery users with small hands will find it a little difficult to hold on the phone for long durations at a go, rest shall be fine.
Performance
The li-ion extended battery which we were provided was rated at 3600mAh which is more than double of the stock battery on the HTC Sensation which is 1560mAh, so was the battery life also double ? Let's find out.
I have been using the HTC Sensation for almost 2 months now and with moderate usage, casual browsing, push email and constant interactions along with a lot of IM and calls, it did last me around 11 hours or so with moderate usage.
But on days when I had heavy usage, with constant data transfers on wi-fi or 3G along with lot of media playback, games, calls and IM - going beynod 8 hours was a tough task for the Sensation.
Now I did spend a nine days on the Sensation with the Mugen Power extended battery, and yes, it works ! And works pretty well following are the figures :
Heavy Usage : 2 days
Moderate Usage : 3 days
Light usage : 5 days
Now let me describe my usage, my heavy I mean constant connectivity either via 3G or wi-fi, 5 email accounts with push email and mails coming in every hour or so on all 5, constant IM i.e. Google talk and Facebook chat, off and on internet browsing, around 40 pictures shot, around 3 hours of voice call, lots of media playback (songs) and even video streaming.
My moderate usage I mean, data connectivity on 2G and wi-fi, push email, selective IM, and 2-3 hours of voice call, with causal browsing and media playback.
Light usage is more like a few texts, some casual browsing and a few calls in a day, with hardly any data usage - more like constant standby.
Conclusion
The Mugen battery is a very good buy and lives up to it's promise of increased power backup. It is a must have for hardcore users and the people who travel a lot, regardless of their usage patterns.
One would however have to bare the slight increase in the thickness of the phone, but amazing amount of backup one gets is well worth it.
But, if you are a light user, and mostly have the phone on standby with a few calls a day, Mugen Power is not for you.
Also note that the HTC Sensation has been known for the "Death grip" issues - but don\t worry the added thickness or the replacement door on the Mugen extended battery does not affect the signal receiving capabilities of the HTC Sensation.
Overall, the battery lives up to the promise of double battery life and has left me much more mobile fearless about the phone battery finishing suddenly !
Is it worth it though? You can buy 2 Chichitec 1800mAh batteries for $40, or other brands like that through ebay
The replacement battery door doesn't look the same as the original battery door from what I can see. Can you post some pics of your phone for us to see
thunderskain said:
The replacement battery door doesn't look the same as the original battery door from what I can see. Can you post some pics of your phone for us to see
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You can watch this video to see how it looks
www.youtube.com/v/s6moi12ZL-4
The back cover is completely different than the original one... It feels cheap and it's not even on the same planet as the original cover.
Also the "8 MEGA PIXELS" mark under the camera is horrible. It's printed very bad and it feels like on fake chinese phones. The battery is awesome, but the cover sucks completely.
Just delivered. Very disappointed, though I have read negative impressions on this forum before... It decreases wifi strength up from 100% to 30%. When you're near wifi router it works fine (like in the video), but when you're 5 metres away from router it drops to 30%.
Does anyone know how to solve this problem? I understand, that their battery cover is extremely bad and doesn't allow to use wifi.. May be there are alternative battery covers for such battery?
galaktiker said:
Just delivered. Very disappointed, though I have read negative impressions on this forum before... It decreases wifi strength up from 100% to 30%. When you're near wifi router it works fine (like in the video), but when you're 5 metres away from router it drops to 30%.
Does anyone know how to solve this problem? I understand, that their battery cover is extremely bad and doesn't allow to use wifi.. May be there are alternative battery covers for such battery?
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Mugen has announced sometime ago on their Facebook that for the Sensation battery they have developed a new backcover that solves the signal issue. Contact them, they will replace it, they always do.
okishead said:
Mugen has announced sometime ago on their Facebook that for the Sensation battery they have developed a new backcover that solves the signal issue. Contact them, they will replace it, they always do.
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Please tell the date of the message.
Anyway I checked the latest messages in the group and didn't find any mentionings. Only hidden advetisement. If they really replace battery cover to a working one, it's good. But right now I DON'T RECOMMEND to buy it if wifi is important for you.
if you get a powerskin and an anker 1900mah battery, you get the same total size battery power, but also have the ability to remove the silicon case and/or turn off the second battery in the powerskin to be used at a later time, and for half the price of the mugen.
Mattcdillon said:
if you get a powerskin and an anker 1900mah battery, you get the same total size battery power, but also have the ability to remove the silicon case and/or turn off the second battery in the powerskin to be used at a later time, and for half the price of the mugen.
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I just wish powerskin redesigned it and got rid of the fin at the side...
otherwise I would have been rocking it.
stll, I think it's a better alternative to the mugen...
Mainspring said:
stll, I think it's a better alternative to the mugen...
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Mugen is not an alternative any more. No one wants to get Sensation without wifi and weak 3g, but with an extended battery. I am very angry...
Mainspring said:
I just wish powerskin redesigned it and got rid of the fin at the side...
otherwise I would have been rocking it.
stll, I think it's a better alternative to the mugen...
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a 1900mah battery is a better alternative than 3600mah? Imho, these are two completely different products that have different purposes. Btw, Mugen offers 1950mah battery as a slim battery alternative.
okishead said:
a 1900mah battery is a better alternative than 3600mah? Imho, these are two completely different products that have different purposes. Btw, Mugen offers 1950mah battery as a slim battery alternative.
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get a Anker or Evo 3D battery on top of the powerskin and you basically around the same amount of power as the Mugen.
plus you have the option of going slim with a higher capacity battery(anker/evo 3d) then stock 1520 mah and a gel case that comes with the powerskin.
on top of all that, it's about half the price... (powerskins around $40, Anker $10-15)
you tell me which one is a better alternative...
okishead said:
a 1900mah battery is a better alternative than 3600mah? Imho, these are two completely different products that have different purposes. Btw, Mugen offers 1950mah battery as a slim battery alternative.
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Isnt the 1900mah of the powerskin in addition to the stock battery? If this is the case it makes the two comparable in terms of capacity.
Mainspring said:
get a Anker or Evo 3D battery on top of the powerskin and you basically around the same amount of power as the Mugen.
plus you have the option of going slim with a higher capacity battery(anker/evo 3d) then stock 1520 mah and a gel case that comes with the powerskin.
on top of all that, it's about half the price... (powerskins around $40, Anker $10-15)
you tell me which one is a better alternative...
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I guess, Anker is really targeting people by selling cheap stuff. I have a phone that costs 700$ and you think that paying another 100$ for a quality battery is a problem? Sorry, I don't believe in 10$ batteries because I have used them in the past and I don't support this idea. 10$ price can only be achieved if a company is cutting budget on smth important.
This is a well known fact: who pays cheap always pays twice.
Product placement
Wow, the OP sounds like a product placement or marketing. It is nothing personal but I read so much comments on Mugen...that it sounds like a rip off.
For my taste your posting sounds a bit too perfect. Like loose 20 kg in just 2 weeks.
I got an Anker 1900 mh and it is perfect. 5 to 6 hours with navigation or 24 hours with moderate to heavy usage...on sense 3.5 - stock kernel. What else do you want....I mean you are not awake for 24 hours...every day...are you?
Just my 5 cents.
Byrana said:
Wow, the OP sounds like a product placement or marketing. It is nothing personal but I read so much comments on Mugen...that it sounds like a rip off.
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I'm sure
My experience. Wanna to be objective:
Positive
Battery works from 14 (high usage) to 25 (low usage) hours. It's very good in comparison with 5-7 hours from original battery.
Cover looks pretty good (in comparison with mugen cover for Desire).
Negative
Wifi and 3G/HDSPA problems
Phone started to turn off sometimes.
If new cover solves this problem I will post the information here. Mugen promised me to replace the cover.
P. S. Your Anker refused to deliver me the battery a long time ago. What's more - they don't have a 3600 mah battery like Mugen.
okishead said:
I guess, Anker is really targeting people by selling cheap stuff. I have a phone that costs 700$ and you think that paying another 100$ for a quality battery is a problem? Sorry, I don't believe in 10$ batteries because I have used them in the past and I don't support this idea. 10$ price can only be achieved if a company is cutting budget on smth important.
This is a well known fact: who pays cheap always pays twice.
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hey, if paying more makes you feel better, more power to you buddy.
I currently use the Evo 3D battery. I can add the powerskin and I'd have about the same amount of power as the Mugen...
and as a bonus I won't have wifi problems(talk about cutting corners eh?), have a silicon case to boot, AND I would still be paying less then the Mugen setup.
I won't loose any sleep over paying less for quality accessories for my phone.
and regarding the Anker battery... just look at the Anker thread. so many success stories... doesn't matter the low cost, long as it works... properly, which it seem to do.
Good review! Thanks!
I love my S4 ever since I hands-on it. Because of my work and preference, I am on my S4 quite a lot--- make phone calls for 1-2 hrs per day, emails, stream google music, fb,etc. I don’t know many things abt extended battery before and think I won’t like the*bulkier*feel of the phone with them, so I have to change my OEM batteries constantly, until I received one unexpectedly from my friend. It is a mpj 7000mah extended battery…not sure if it’s a good third-party seller without this knowledge…my friend is gonna upgrade to Note 3 and gave his s4 extended batteries to me.
Now I would like to get an extended battery as a back up to my backup rather than several oem batteries. The extra juice is definitely worth the extra bulk and weight! And the bulkier feel of it begin to grow on me..lol.. it's comfortable to*hold.
sayeka said:
I love my S4 ever since I hands-on it. Because of my work and preference, I am on my S4 quite a lot--- make phone calls for 1-2 hrs per day, emails, stream google music, fb,etc. I don’t know many things abt extended battery before and think I won’t like the*bulkier*feel of the phone with them, so I have to change my OEM batteries constantly, until I received one unexpectedly from my friend. It is a mpj 7000mah extended battery…not sure if it’s a good third-party seller without this knowledge…my friend is gonna upgrade to Note 3 and gave his s4 extended batteries to me.
Now I would like to get an extended battery as a back up to my backup rather than several oem batteries. The extra juice is definitely worth the extra bulk and weight! And the bulkier feel of it begin to grow on me..lol.. it's comfortable to*hold.
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I began using one on early this year, I can't accept it at first but now I would be lost without it. I love my extra battery, never have to plug in when I am at work again and if I go out I am not worried about it again...
Having only a 5200mah extended battery (with a flipbook case glued to the cover), it does get me thru the day, most days.
I do feel more secure holding it with the extended battery, the standard (samsung) back cover is more slippery and the added weight and thickness gives more surface to hold on to. Had an extended battery on my last phone (galaxy nexus) with the same results.
Longer battery autonomy, better grip and harder to find a fitting case or pouch (thats why i got one with case attached to the back cover).
I am still getting used of it:fingers-crossed:
Reading this, one thing comes to mind I'll f... you till you love me
Sorry no intention to insult anyone just couldn't resist I would not put extended battery on my phone, because it makes it look like a brick, but then I don't relay on my phone for work like other people do and I can always charge it up since I'm in the office all day.
Extended batteries are no different then any other accessory for any smartphone . Some people due to their work situation needs a screen guard or rugged case or an extended battery . Personally I like how the S4 is with its stock battery but to be honest for my usage patterns it just isn't enough battery power . Between phone calls , facebook during lunch,various texting and music for the gym the stock doesn't cut it . I love being free'd from the charging cord and no longer wondering should I charge this thing before I leave the house again or am I going to have a dead paperweight . Id rather carry a brick for a phone then a dead one or until battery technology gets better .
Personally, I feel it made the phone easier to handle.My friend all agreed that it was easier to hold and felt more sturdy.
I agree with you guys but for me it's a no go for the simple fact that I can't use the Spigen Slim Armor View case with a extended battery.
Or is there something similar for extended batteries?
Badelhas said:
I agree with you guys but for me it's a no go for the simple fact that I can't use the Spigen Slim Armor View case with a extended battery.
Or is there something similar for extended batteries?
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Anker has a 5200mah battery case with an s view cover.
Sent from my SCH-I545 using Tapatalk
I like the idea of an extended battery, but I just don't need it. For those who do, good for you.
But how long do you take to fully charge it from zero percent? And what charger do you all use, the original samsung one?
I just thought that charging it would take a long time too. But it shouldn't be a problem if you leave it on the charger overnight.
worktorest said:
I like the idea of an extended battery, but I just don't need it. For those who do, good for you.
But how long do you take to fully charge it from zero percent? And what charger do you all use, the original samsung one?
I just thought that charging it would take a long time too. But it shouldn't be a problem if you leave it on the charger overnight.
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The samsung stock charger should put out around 1700ma.. so just divide your battery capacity (5200mah) by the 1700ma.. and you get ~3 hours.
Extd batt has been my favorite product on S4
I loved the zerolemon 7000mah for the s3, for me it was the perfect size and not having to worry about battery life is amazing. I Bought the ZL and felt it slightly to big for it to be comfortable. I am going to try anker.
It would be nice if it fits in my pocket.
I've been looking around at the extended batteries for the Note 4. Which one do you consider the best?
Right now I'm leaning towards the Hyperion 8000 mah version.
The ZeroLemon does seem to have more capacity, but it does seem to have issues involving the battery reading because of the TriCell design? Can anyone confirm this?
I suppose then that would be combined with the ZeroLemon case. Unless a mod is possible?
By mod, this is what I mean:
http://forum.xda-developers.com/showthread.php?t=2530547
Anyone try something like this with a Note 4 Otterbox?
The reading issues are resolved with a custom kernel such as Emotion, which is patched to recognize the added capacity. I don't have the ZeroLemon or the Hyperion, but I do have this one and I quite like it. It is an off-brand, but I get exactly 3X my normal battery life with it, so it's legit and a good discount alternative to the ZL if you're trying to save a few bucks. I've tried to fit it into my otterbox but it's too bulky. Supposedly the official ZL cases will fit it though.
Zerolemon is pretty good. I don't really have any complains and I get anywhere between 10 to 19 hours of screen time on average with 12-15 being the average. The cover is very beefy and protective. The readings however can be inaccurate and when I sense this I just reboot the phone and it magically adds anywhere between 5-30%. There are some workarounds but they're a bit problematic. It's best to use a custom kernel that is especially tailored for zerolemon or extended batteries in general.
I switched to 5.1.1 on my 910C and flashed http://forum.xda-developers.com/note-4/development/n910c-kernel-5-1-1-stock-tw-permissive-t3206548/ by shreqg2 and it's working well as far as battery accuracy goes. The downside is that it doesn't have the 5.1.1 stock kernel cpu governors and overclocking the stock kernel provides (it can go up to 2100Mhz on BIG and 1900 and 200 Mhz on LITTLE as opposed to 1900Mhz BIG and 1500Mhz (or was it 1300?) on the 5.0.1 kernel. I guess it's not really a big deal since I've been stuck with the lesser frequencies since 4.4.4. Hopefully someone can write a proper kernel with the recently released kernel source code but I'm not sure. Really though, a lot of kernels have extended battery considerations and I'm just testing.
Edit: added screenshots with the new kernel. Rebooting gave me about 5%. It's working very well so far but this is the first discharge since I flashed it. Looks promising. It runs very cool too.
I'm going to be getting the SM-910W8 as I live in Canada (decided to go with it after the disappointment of the Note 5 and because apparently, according to the carrier phone salesman I spoke with, the Note 5 has been having reception issues and they aren't sure if it's hardware or software).
Not sure yet if I will go with an AOSP or TW based ROM though. It's a decision I have yet to make. But so long as the ZeroLemon has the full capacity it should be good. I am tempted though to go with the Hyperion as it does seem to be a single unicell and I have an offer for a cheap Otterbox Defender (which should keep it thin and protected).
Any kernel recommendations for extended batteries and performance in general?
Happy with Anker's 6440mah battery I recently bought, % indicator is accurate and doubles my usage time.
The back cover is slippery compared to the original.
Hi, i take here my "long" experience with extended batteries for different phones. I used Anker and Zerolemon brands.
Since I started to use my Note 4 (last February) Zerolemon's customer care replaced me the battery (10000mAH) because the phone turned off suddenly after only few days of Zerolemon battery use.
The new battery has lasted working fine for about six months but since one month I still have problems even if they are not frequently like first time (now i'm still using the battery..).
I have noticed that when you press at the top of screen the phone turns it off or restarts and I think that is an issue that concerns the contacts of battery to phone. I applied a bit of tape to keep the battery as good as pressed into the slot to avoid contacts issues.
(Probably the battery is too heavy to warrant a good fitting...and maybe the 6400 Anker could be the best solution..)
However I noticed that even when I can ensure that the battery is fine fitted the phone turns off or restarts anyway. In these cases I think that is an internal issue this time.
I don't know if these issues concern only first stock of Zerolemon's battery and now Zerolemon has fixed the issues.
In my experience I remember that I've never had these inconveniences in my S3 phone with Anker extended battery and in my S4 with Zerolemon battery.
I'll follow this thread because I'm searching a best extended battery for my phone...
P.s.: I use Zerolemon case with clip/ holder
Sent from Note 4 device - Rome - Italy
Ive had hyperion extended batteries, zero lemon batteries, and others and I have to say Anker makes one of the best batteries for phones, period. Hyperion has some stylish cases for their extended batteries which I love but their batteries aren't one piece and more like 3 pieces attacked and covered with a sticker. I never had any problems with it but its not as good of quality as a zerolemon or an anker battery would be.
Anker extended batteries have a plastic back that holds the battery and is a much more premium battery. Also their customer support is superb. My Anker 7500mah battery went out on my GS3 once and I sent them an email and boom they give me a new case and battery free of charge.
Zerolemon batteries are also known for their quality but they don't try to hide the fact that they make brick sized batteries and that's a downfall in my opinion because a phone with an extended battery still needs to be managable and fairly easy to hold but Zerolemon's 10,000mah BRICK may hold tons of juice but isn't practical. But they still make amazing batteries.
There was a battery thats someone posted that fits our existing case. I am unable to find the link. I think the battery was 5400mha. Anyone what the wed site?
Does the battery other than the original battery does not damage the device ?
ozerarincc said:
Does the battery other than the original battery does not damage the device ?
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How so? Please elaborate
Any extended battery's that aren't all big and bulky?
ChillaMxM said:
Any extended battery's that aren't all big and bulky?
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Stock form factor: http://www.ebay.com/itm/271990613473
I bought two of these, so far pretty good results.
fz798 said:
Stock form factor: http://www.ebay.com/itm/271990613473
I bought two of these, so far pretty good results.
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How can a stock sized battery have almost double the juice?
xbmoyx said:
How can a stock sized battery have almost double the juice?
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Well i know that lithium ion batteries are the 1/4 size of lead acid batteries but we already have li-ion batteries on our phones so im interested to see as how they crammed that much juice in there
I'm a bit skeptical between the Anker extended battery and Hyperion battery, they seem to be about the same size and shape, and the provided back covers look to be the same as well, but yet they have different rated capacities? I only have the Hyperion 8000 mAh so, I can't fairly comment on this but does anyone have both?
Siege630 said:
I'm a bit skeptical between the Anker extended battery and Hyperion battery, they seem to be about the same size and shape, and the provided back covers look to be the same as well, but yet they have different rated capacities? I only have the Hyperion 8000 mAh so, I can't fairly comment on this but does anyone have both?
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never knew Anker made extended note 4 batteries (thought they only made replacement batteries). As its not listed on their website.
Anyways, has anybody heard of Dr. Battery? http://www.drpowerglobal.com/drbattery/model/samsung/sm-n910c/css249r.aspx#rp
says it's a replacement battery, but the capacity says it's 3500 mAh. But on best buy canada, it says it's 3000 mAh.....
Also has anybody notice that MYDE and Anker has very very similar description.
Anker:
We wouldn't give you anything less than the best. Grade A cells chosen from among the top 10%. Rigorous inspection tests to ensure reliability. A built-in IC chip to prevent against short-circuiting. Complete NFC functionality. What does this all mean? In terms of quality, you won't find a better replacement. Don't just take our word for it, though - type in any quick, power-related search on Amazon and see who pops up. As the leader in our industry for the last 3 years running, we know batteries.
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MYDE:
We wouldn’t give you anything less than the best. Grade A cells chosen from among the top 10%. Rigorous inspection tests to ensure reliability. A built-in IC chip to prevent against short-circuiting. What does this all mean? In terms of quality, you won’t find a better replacement. As the leader in our industry for the last 8 years running, we know batteries.
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fishy.....
hey guys i have been using the zero lemon for some time now, i think its been a year now i believe. it started acting up on me after a year, it would reboot on its own, i know its the battery because i used the standard one and it works fine, (im on it now) so i was looking to see if there are any better batteries, i found one chinese base and said its 5600 mah so when i get it, i will update and let you guys know if its a good buy. they said its standard size and it uses a charge of 4.4 but we'll see. just felt like giving my two cents. how is that ebay battery going since you have been using it? whats the amount of time you are getting on it? my main thing is to have it not run out of battery for just ONE full day. I can care less for a battery that stands 3 days since I do go home and sleep sometime and I can charge it during that time.
divineazn716 said:
hey guys i have been using the zero lemon for some time now, i think its been a year now i believe. it started acting up on me after a year, it would reboot on its own, i know its the battery because i used the standard one and it works fine
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It might not be the problem with the battery going bad — I had the same issues: constant reboots after a year usage…
However I noticed it would always reboot while handling the phone — I'd put it down on the table, throw it on the bed. Got me thinking it might be some looseness in the contact — the battery seems tightly stuck in — but anyway I tried and jammed a folded strip of paper in the bottom edge of the battery compartment, so that a piece is jammed under the ZeroLemon battery and a piece on its side.
Since then — zero reboots — the battery is rock solid — so I think after a while the battery gets microscopically loose — it being heavy and all — and that causes the reboots. My paper fix solved that and it's been perfect since!
--
白い熊
Very bad there isn't a 25% bigger battery like s5.. A battery 4500 ma with 1-2 millimeters bigger size would be fantastic. I don't understand how so, no Chinese sells one.. Probably they dont want money..
fz798 said:
Stock form factor: http://www.ebay.com/itm/271990613473
I bought two of these, so far pretty good results.
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What is your phone model number? can you tell us what is your screen on time (SOT) with this type of battery?
For years now manufacturers have thought we prefer having dead but omg so thin phones instead of ones that actually make it through the day. I've always bought phones that had removable batteries so that I could buy extended batteries and turn my phone into a brick that allows me to charge it at night and use at will during the day. Most of these are oversized and require a special back cover. However, I see a lot of 'slim' extended batteries that can fit into your current phone without a bigger back. They're plentiful, and they're cheap. So why don't manufacturers just include an extended battery that is the same volume but more capacity?
I suspect that perhaps they're less safe? I recently had an extended battery start bulging inside my phone and pushed the screen up a little. I wouldn't have noticed if the screen hadn't started coming up. Scared me a little, we've all seen the pics of phones that have exploded in people's pockets.
Does anyone know more about this than me?
I dont know more about this than you?.??
YYing said:
I dont know more about this than you.
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wellokthen.....
They are only marketing duds ... the battery in the phone it is the same like the extender ones but be ready to catch fire because they land faulty compared to the one in the phone. Always check the manufacturer!
TaureanZen said:
They are only marketing duds ... the battery in the phone it is the same like the extender ones but be ready to catch fire because they land faulty compared to the one in the phone. Always check the manufacturer!
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I've never had an issue with the extra large extended batteries that require a special back. Those always give a huge boost to battery life.
The slim one that I put in my G3 D855, however, is definitely a dud. I'm on a Marshmallow ROM that shows the estimated electricity use per app, in mAh, which has made it really handy for calculating the capacity of the battery. Every time my calculation comes up at about 3000 mAh, the capacity of the stock battery.
So that's $15 American that I'll never see again....oh well. Guess you can't have your cake and eat it too. My next battery will be gigantic.
the slim battery was to cheap and the reason for bulging
I ordered this case with a 50% discount from Amazon.com, so I'm only half biased here. If I would have received this case free, this would be written differently, as a disclaimer.
I've had this case for a little more than a week, and I must say that it's pretty handy. To get there most use, I suppose the meaning of the instructions might indicate discharging the phone to about 2-3% usable power before pushing the little button on the reverse of the case. Complete power cycles on advanced lithium cells isn't necessary, but could improve life of the device battery, not the extended battery. Using the battery and putting the phone in the case can be done by an early teenager. Very simple design indeed, but effective. One thing lacking in the instructions, is that it's written like when these were installed on devices with removable batteries and went straight into the terminals as a replacement. The days of running my battery on a note 4 until at two percent for about 8 hours are over. I think as an auxiliary battery, it's better to start charging around 15%, because the LG V30 starts doing its battery saving thing then. As far as cost and value, the benefits outweigh the cost moderately because if you're willing to part with what you'd spend on Bluetooth speakers, decent earbuds, or a case, for example, maybe you'd like to be able to do long trips, or drive Uber or Lyft for extended periods without plugging into a 12v charger for a couple days.
I was able to squeeze three days of continuous use, navigating on the bus system in Phoenix, bumping my Apple music, browse news, take lots of video, use Twitter and Instagram for hours, edit articles on Wikipedia, and another wiki without worrying about losing my changes.
I'm in Arizona, where heat can sap a 3000 mAh battery's power very quickly, and this heavy, however robust product exceeds my expectations over and over. I'm considering a 10000 mAh battery for my Note8 next. One cool feature is the center of gravity of all things considered. If dropped, the heavy side falls first, and though the case provides no protection, the concept of the peanut butter on bread dropped from a ladder landing peanut butter side down still holds true here. Most falls from height should be on the battery because of this phenomenon called gravity.
Only downside is the weight. It's almost a pound more. But if you're me, you're caring a gallon of water with you which is about seven pounds.
I rate this accessory a 4.75 out of 5 just because of the cumbersome design.
I'd improve the spread of the load across the entire device with two or three cells connected around the camera and fingerprint sensor in addition to the big cell at the bottom, and even out the case, so that it's not all at the bottom.