Hi everyone, I am a pretty technically savvy person, but a newbie to the world of smartphones. I just got a MT4GS this week and have been getting used to it for the past few days. My main concern is the battery life - understandably, compared to my old feature phone, the smartphone is going to use a lot more juice. I just wasn't expecting to charge it overnight, have it plugged most of the day at work, and still be down to ~70% power by the time I get home. I'm not even doing anything that intense with it. It worries me to think that my phone might die on me if I'm out somewhere for the day. And what is the point of having a phone that can run programs and do all these great things, if you're afraid to use it?
After reading around here, I've already picked up a lot of great tips: I ordered a set of the Anker batteries (my phone was purchased used, and while it is physically in great condition, who knows about the battery), and I installed the 2x Battery app. I've reduced my screen brightness; turned off background data; turned off GPS; and when I'm on WiFi, I have 4G off, and vice versa.
A couple of questions:
1) Without doing anything crazy to the phone or default OS, is there anything else you recommend doing to conserve battery life?
2) In 2x Battery, there is a setting "Pause when WiFi on." The description here is kind of confusing, and I can't tell if it's working or not. If I want the mobile data connection off when connected to WiFi, do I want this option checked or unchecked? Right now I'm connected to WiFi, but it appears that mobile data is on whether this box is checked or not.
Thank you so much for all the great info so far, and for any advice you can offer me )
Well, firstly, good call on the anker batteries. I have one, and it's changed my life with this device. I went from being exactly as you described (scared to go somewhere without knowing exactly where my next source of power was) to not paying it much mind.
Secondly, if you are unrooted stock - then you have a whole lot of apps working in the background and conspiring together to drain your battery. ...and there's nothing you can do about it because both T-Mobile and HTC saw fit to place them there, running around the clock and beyond your control.
This is known as bloat, and on this phone it's beyond out of control. It's out of control on other phones, but they took it to a special place of exasperation on this one.
I am not sure about this 2x battery app you're speaking of, i've never used it. Consider this, though, it's one MORE app running on your device and draining your battery - and if you are stock this may be something you can ill afford.
As far as the wifi/data dance, this is nothing more then a feel-good measure that really isn't doing anything for you except adding to your interaction with the device. The time your screen is on to make that change takes more battery use then you would save on several hours of having one or the other switched off.
Check this link below (another XDA post):
Everything you wanted to know about Li-Ion batteries but were afraid to ask!
...and it may help you out with battery care.
For me, running my custom ROM with an anker battery and all the apps/widgets I prefer to use I can get 6-8 hours out of a charge on the anker battery with semi-steady usage.
This is with both wifi, mobile data and background data on, and the screen on but at mostly dim brightness for 4-5 of those 6-8.
If I overclock the processor to 1.7Ghz (stock it stops at 1.2Ghz) and hook it up to a television using a playstation (game console) emulator...running flat out at full speed I can drain the (anker) battery in as little as 3 hours.
Something that may interest you as time wears on and you get used to having the anker batteries and using them is what is mentioned in this thread:
external battery pack! Awesome!
...and there are many out there and good deals to be had on some, poke around a bit and you'll find one suitable if such is your desire.
One last thing to consider - make sure you are using the proper charging port.
Most USB ports on computers only push half an amp, as well as nearly every single secondary port on chargers (think car chargers with an 'extra' USB port). Half an amp is not enough current to charge the device if being used, and barely enough to see positive battery increase if not.
Make sure whatever you plug into is pushing 5volts 1amp, or you'll see your battery level continue to drop as you are charging.
(oh, and GPS is something you WILL see more battery life from turning off if not using - so having something like a soundhound app widget on your home screen with location on will eat your battery before you know it's gone by activating the GPS.)
Dimming the screen if possible will see you the greatest gains in battery life, and then getting rid of any apps you can that are running in the background is the next biggest step - but again, if stock and unrooted there is only so much you can do on app management.
DON'T USE TASK KILLERS - EVER. (they do much, much more harm then any falsely perceived good you may think you are getting from them.)
Recap:
Screen = biggest battery drain.
GPS chip/use = second biggest drain.
Apps in background = third biggest drain.
Wifi/mobile data = negligable drain.
Hope this helps a bit.
Edit:
Oh, and welcome to XDA!
Blue pretty much covered everything that I was going to say. I also have the Anker battery, and I also have the Anker 5600 mah external battery, and I no longer have battery worries. I choose the Anker external battery over the other ones because of its small portable size, even though some of the other ones have more capacity. I find that I can get about two full charges of my phone with it, and it is small enough to fit in my pocket or purse with no problem. I highly recommend an external battery just for piece of mind, knowing that I no longer have to be searching every place I go for an outlet. I love that I can charge my phone while it is in my pocket or purse. Also the price isn't too bad, I bought mine for about $40, but I see Amazon now has it for $33. I bought it from a company called Laptop Mate on Amazon, and it was shipped amazingly fast even though I just got standard shipping. Laptop Mate then said if I wrote a review I could choose a free gift. The gifts were not anything spectacular, but the gesture was nice. At the time I could choose between a usb powered reading light, a card reader, and I forget what the other one was. Again nothing great, but it was just a nice bonus, I will definitely buy from that company again. So with my Anker internal battery, and my external battery, I could reasonably not have to plug my phone into the wall for at least two days, I could stretch it more if I was camping or something. I really like keeping my screen at full brightness, so that is where most of my drain comes from. Well, sorry for the long winded response, and welcome to XDA. I bet that in a month you will wonder what you ever did with out a smart phone.
http://www.amazon.com/Anker-Externa...on/dp/B005K7192G/ref=pd_rhf_gw_cpp_tab0_p_t_1
Thank you so much for your very thorough responses! I am happy to report that since making a few little changes (turning down my screen brightness, turning off the background data sync), performance is already noticeably better. Yesterday I was on battery power for close to 14 hours, was on and off WiFi, talked on the phone probably a couple hours total, and used it what I would consider a "normal" amount (e-mail, photos, some social networking)... and still had ~50% power left by the time I went to bed. That is much more reassuring to me, and I can only assume performance would get even better once I get those new batteries.
I understand about the "bloat" and having all these extra things running, but I think doing anything with the ROM is a little above my expertise at this point. For now, things seem to be working reasonably, so we'll see...
I like the external charger idea, but I am going to hold off for now. I ordered the 2-pack of Anker batteries, so once I get those, I'll have 3 batteries. One should be fine for a normal day, and if I'm really going to be out for a while and not have any opportunity to recharge, or will be using the phone a lot, I could just bring along a spare or two. (Good thing I am a lady with a purse - what do guys do?! Carry a man bag? My husband is considering getting the same phone, so this is a valid concern.)
I'm apparently too new to post a link to 2x Battery, which I've seen mentioned elsewhere on this board, but that's the name if you want to look it up in the Android Market. Even if it is using a little more battery power, I think it's worth it. It puts controls for things that use battery power all in one place, and it makes it very easy to monitor the current battery status. I think I'll stick with it, at least until I get a better sense of how my use affects the battery.
Per the question of a man hauling batteries, I just carry a spare battery or two I'm my front pocket. If I am carrying keys I will slap a piece of tape accross the terminals to prevent a short. One or two guys carry their spare gear in a camera case. I can haul most all I need in a corner of my Levi's front pocket.
I also used to run Juice Defender, it got irritating waiting for the data connection to spin up and the benefits were outweighed (IMHO) by the downsides. Killing data every time the screen turns off was grim.
Hastily spouted for your befuddlement
I have a zipper case I keep the phone in, and it's not much larger then the device itself. Above and beyond keeping dust out ( primary function ) it also has a small pocket on the outside I keep a few knick-knacks in, like a retractable micro-usb cable, backup memory card ( recovery purposes) mini flash drive and spare battery.
I highly recommend some kind of small zipper case for the device to keep out the dust, best $10 investment I've made for the phone.
Not in a position to link pics at the moment, but I'll do so over the next few days when I get the chance - especially floating loose in a potentially dusty purse it's something to consider.
I wish the video cable was something I could cram in to it as well, but that presents too much bulk for it to work, I have a mini camera case I carry sometimes with the A/V cable, AC adapter, another micro-usb cable and some memory cards and flash drives - something to consider for yourself for carrying cables and such since you most likely have room in your purse for a mini camera case with such things.
Sent from a digital distance.
Thanks for all the carrying tips!
Blue6IX said:
I highly recommend some kind of small zipper case for the device to keep out the dust, best $10 investment I've made for the phone.
Not in a position to link pics at the moment, but I'll do so over the next few days when I get the chance - especially floating loose in a potentially dusty purse it's something to consider.
Click to expand...
Click to collapse
I'm not really worried about my own phone, it has its own little pocket inside my purse, and I don't know what kind of ladies you hang out with, but my purse is not dusty...
Please forgive - I meant no offense by it.
I threw in the word potentially because while I have seen some pristine purses, i've also seen some which haven't been vacuumed out in a long time, if ever. The very fine dust that gets in during the course of normal travel is what our enemy is here. (...and yours may be vacuumed out on a consistent basis, really only you can know.)
This need not just be dirt, even the fibers of the material wearing off in tiny fractions of an amount from simply carrying it around (material rubbing against material as it's shape stretches, bends and contorts) is enough to be a hazard to the device. Over time this adds up.
(though, saying it has it's own pocket/pouch within the purse itself lends a good deal more protection and paints a much better picture then the previous blanket statement of 'in my purse')
Due to the slide mechanism and the exposed back of the LCD screen it is very easy to get dust under the screen, in between the layers of it.
Slide it open with the screen at max brightness, then flip it over. Look at the very end of the slide channels on the screen side, from an angle on the side. You will be able to clearly see the light shining through opposite the T-Mobile branding on the backside of where the genius button is. Look past the greenish tint and see the whitish light, noticing how it extends inwards.
You can now look at the other side, right by the T-Mobile branding in the same spot and though you can't see the light shining through, you can see how very fine dust can work it's way in between the digitizer and screen.
'Dust under screen' is something that people who post here at XDA have made warranty exchanges over, as well as who knows how many who don't post have done. It's a valid exchange gripe that is in fact covered under warranty from what the people who have posted about it have led us to believe. There are also plenty of 'dust under screen' doubleshots on reduced price on ebay that you could look up this very moment.
Again, I meant no offense, but was simply trying to use the situation presented to illustrate a potential hazard your new device could fall victim of. Hopefully by bringing it to your attention you can take steps to minimize any damage, or at least present you with the opportunity to later be in a situation of:
'Oh well, at least I knew it was coming'
...as opposed to:
'Wow, I wish I knew that could have happened'
We only wish you to get the best experience possible from your Android, and while there is a lot of important info here...'tis easy to become overwhelmed by it all and miss some of the important things that could help you immediately, or should be known immediately.
Glad to hear you are already in better straights over the management of your available power!
By the way - thanks for endeavoring to clarify the app you were using for battery management, i'll definitely scope it out when I get a chance.
Blue6IX said:
Please forgive - I meant no offense by it.
Click to expand...
Click to collapse
None taken, I just thought it was funny
Thanks for the tips about dust, though. That wasn't something I had really considered, though I'm hoping to get a bit more life out of this phone than my last few (cheap, and switched on a whim), so I'll be sure to keep things clean. Is it ok to spray the back of the slide-out with some compressed air, or could that cause other problems?
Little update:
I did use a little compressed air to clean out the back of the phone, so hopefully I didn't hurt anything.
Two different cases are on their way to me - I'll see which I like more and return the other.
I've had the Anker battery in for just a couple hours, and it's already amazing! I've been using the phone a decent amount, turned on notifications and everything I'd switched off, and it's still at 100%! Also feels much cooler than the other battery. It was a tight fit, like everyone said, but I did get it in and fit the back cover over it.
But, weird thing: when I turn the phone sideways, the screen no longer rotates. It will still rotate if I slide the keyboard up, but otherwise it's like it doesn't recognize that the orientation changed. Did the battery mess something up?
The screen didn't rotate on it's own unless you slid the keyboard out if you are using the stock launcher - you may have made the same mistake I did in thinking it was so, but it wasn't.
Home screens, in the app drawer...etc... not made to auto-rotate.
You just happened to finally realize it - same thing happened to me.
I even argued against it, and couldn't figure out why it was changed.
A while later while I was going through the code that comprises Rosie (sense launcher) I actually saw that it wasn't made to do so.
So no, the battery didn't mess this up, it's the way it was supposed to be.
The reason for it is there is an alignment issue with some widgets when it switches from portrait to landscape in Rosie. I'm not sure how to fix it the way they have it coded, i've been scratching my head on this one for a while and tried a few things with no success.
HTC could learn a few things from some aftermarket app designers ( like the team that made GO launcher, for instance)
The way they built it, I don't think it's possible to fix their mistake, it's too interwoven and embedded in the design of the code.
Edit - it still and always has, autorotated while you are in apps themselves if they support it.
Oh you're right! That's funny, I never noticed before. In other apps, the screen does rotate normally, so I guess all is good...
Going on 12 hours with this battery, with all notifications, synching, etc. turned on, and I'm still at 67% ... And this is right out of the box, without the 4-5 cycles they recommend. I'm very happy with it so far!
Hey guys,
for a few weeks now, my phone has been randomly shutting off at the slightest increase of load. Whether it be loading a YouTube video, playing the casual session of Cut the Rope (Does it count as casual when you complete all three parts with perfects everywhere in about two weeks?) and maybe Plants vs Zombies.
I've not seen similar symptoms on XDA, but who knows when it will hit the next person?
Now, I've searched quite a few forums, such as Android Central, but haven't found a thread similar to this.
I created this thread, in the hopes that it'll help some more people.
Read on if you think you have a bad battery.
Likely symptoms of a bad battery
Serial number starts with BD (Could it be short for BAD? Illuminati! Just kidding )
Phone randomly shuts off completely at the slightest increase of load
Phone refuses to power on again for a few minutes (Turning it back on usually causes it to shut off before/during boot)
The phone constantly looses signal
The phone gets extremely hot when not being used
I've had all of these symptoms and I can promise you it's a known problem.
What will happen if I don't change the battery?
Several things might happen if you don't change the battery:
The battery may explode (Leaving you with either a really big hole in your leg, or worse you might loose some bits and pieces.
The battery may leak and damage your phone irreparably.
The battery may leak and corrode your legs, clothes or what ever encloses the phone.
What can I do?
You can either go to a Samsung Repair Centre or go to your local retailer/provider.
They should cover this under warranty, no matter if the device is rooted or not.
If they don't, you CAN press charges/sue the company/provider.
Why? If they do not replace your battery, they may lead you to harm either by explosion or corrosion.
But that's a last-resort.
What I did, is following:
I called my provider (German Telekom, call them for free from your mobile in Germany under
Code:
2202
) and told them what is going on. They asked me what exactly is happening and got following response:
German Telekom Call Centre Agent said:
Oh, f*ck. Get to your nearest store and get that replaced immediately!
Click to expand...
Click to collapse
which is what I'm doing tomorrow.
You can always use this as a good excuse to buy one of those extended batteries, but why should you? The stock battery is pretty decent.
I'll update this thread when I'm back or on my way back home and let you guys know what exactly happened.
I hope this can help someone with these issues and I can help prevent loosing a leg, or worse, different bits and bobs.
If you're experiencing this problem, and you've done something similar, let others know below!
Edit: I had a Galaxy S III lying around. It's battery fits more or less snug and works as long as you have the back panel on the phone. I'm using it until I get to the store tomorrow.
Yeah....I had the battery problem on S4 about two months ago and Samsung confirm that it was a known issue and that about 30% of S4 battery might be affected. They replaced my battery without any question asked.
See link below as well:
http://www.trustedreviews.com/news/...lems-samsung-offers-free-battery-replacements
Part of the symptoms include swollen battery as well. My battery got swollen to a point that it started pushing my battery cover and the screen out. If you want to know that you have a swollen battery, put it on a desk and give it a spin. If it rolls (with the middle of the battery touching the desk) , then you have a defective battery and you should get it replaced at no cost.
Another symptom is that your battery could go from 100% charged to 0% (phone won't be able to start unless you connect a charger) during a reboot. It will then jumped to about 80% full after connecting your phone to a charger.
Beatsleigher said:
Hey guys,
Edit: I had a Galaxy S III lying around. It's battery fits more or less snug and works as long as you have the back panel on the phone. I'm using it until I get to the store tomorrow.
Click to expand...
Click to collapse
May I propose you to use the SEARCH button BEFORE you will start another thread?
I know it is painful, as you just have discovered America... sadly, you're the 1492nd person who did it in last week only.
possible search result, if you'd not be too lazy...
May I propose to read the thread?
It contains solutions and symptoms of a bad battery. And I was giving my personal experiences
Sent from my GT-I9505 using XDA Premium 4 mobile app
Beatsleigher said:
May I propose to read the thread?
It contains solutions and symptoms of a bad battery. And I was giving my personal experiences
Sent from my GT-I9505 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Symptoms: serial number of faulty batch; swithing off while showing different load state, heating, swollen battery.
Remedy: replace the battery. By purchasing, visiting the Samsung centre or calling the Samsung Customer Help in ANY country.
So, please, read the linked thread again. Take special attention on the posts: 1; 2; 9; 12; 17; 18; 28; 29; 33; 34; 36.
So far, you were unable to find the linked in my previous post thread, what gives some interesting picture about the ... ability of searching.
Symptoms: wrong as well, because typical for DB bad battery case symptom is that you cannot turn the phone on back again, no matter how long you would wait, without putting the phone to the charger. As well, phone was not going hot (above normal level) no matter, used or not.
Finally, the phone wasn't loosing signal more frequently than normal.
"What will happen section" :, your statement that bad BD series battery will leak, explode, cause the nuclear blast or whatever is unjustified, because the battery is swelling so badly that it would damage the screen much faster. ( further info here and here - I hope you will be able to find the appropriate posts by yourself. If not - please ask, I will help you if your parents are too busy).
Furthermore, so called solutions you tried to provide are ridiculous, as Samsung knows the problem with BD batteries and replaces it without single word, worldwide (examples from threads: Asia, Australia, Africa, Europe).
Last but not least: on the XDA, there is simple set of rules, where one of them states: DO NOT REPLICATE the posts and threads, USE the search button before posting and add your comment to the existing thread before starting a new one if the similar thread exists.
so far, your thread is the 4th related with officially called back by Samsung faulty BD series of batteries.
I don't see anything wrong with this thread and am leaving it open. It provides useful information, which is clearly outlined in the OP, and may cut down on future threads being opened about it.
Towle
Forum Moderator
Hi guys
So I'm my country South Africa this isn't locally available however its possible to import it using amazon. As with any device, before I buy I read through the xda thread for it.
Some alarming things have caught my attention namely the kill switch thing. I have a vague understanding of what it is but I don't know what triggers it.
I'm looking at buying the newest shield tablet, the one for $200 without the stylus. Is this tablet affected by the kill switch thing?
Lastly, how is it to flash TWRP and root?
The Shield Tablet K1 does not have the kill switch.
Flashing TWRP and rooting is easy.
As edisso10018 said, rooting and flashing twrp is pretty easy, As for the kill switch, the Original Shield Tablet has the kill switch not the Shield Tablet K1
Cool thanks guys.
Also this kill switch thing was created because there was a fatal flaw in the y01 series battery and it proved hazardous as in it exploded in several events and when lipo go off they can cause serious damage so in order to cover nvidia's butt they issued a mandatory recall send new tablets to owners and then pushed out an update that is supposed to brick any of the tablets with this battery in it. Near the end of the recall they stopped requiring the bad tablets back and if you did not go on the internet before killing it services you could keep the Pyro tablet going it was strongly suggested that the Pyro battery is pulled and replaced with another cell the of Nexus 7 cells seem to work...
mirrin said:
Also this kill switch thing was created because there was a fatal flaw in the y01 series battery and it proved hazardous as in it exploded in several events and when lipo go off they can cause serious damage so in order to cover nvidia's butt they issued a mandatory recall send new tablets to owners and then pushed out an update that is supposed to brick any of the tablets with this battery in it. Near the end of the recall they stopped requiring the bad tablets back and if you did not go on the internet before killing it services you could keep the Pyro tablet going it was strongly suggested that the Pyro battery is pulled and replaced with another cell the of Nexus 7 cells seem to work...
Click to expand...
Click to collapse
Please cite the latter, where you suggest Nexus 7 battery works.
Soyurn said:
Please cite the latter, where you suggest Nexus 7 battery works.
Click to expand...
Click to collapse
http://forum.xda-developers.com/showpost.php?p=66585885&postcount=53
There is two things I have issue with in his directions but as I don't have a Pyro or a spare Nexus 7 battery to mess with my warnings are probably safe to ignore.
1. The ribbon should be going to a similar board that he took off the stock battery pack. In theory those two wires he does nothing with are for the temperature sensor and signal wire to tell the charging circuit to shut off. By pealing back to that board you should be met with a bare li-ion pack with 2 leads a positive and negative and some sort of temp probe. It should be possible to remove that board and place the shield's protection board on that lipo.
2. It should be possible to connect the other 2 wires to the shield rather than use the old y01 protection which may or may not be involved in the issue.
In addition thus gave me the idea of putting 6-7 18650 in parallel using a combination of a 3d printed back and a hole cut in the OEM backplate the 3d printed part may or may not be removable to swap the cells live. But having a 9000+ mAh battery might be worth the junk in the trunk you just added... The batteries would double the thickness but each 18650 holds between 2000mAh and 3500mAh by my measure in the spot of the battery you should be able to fit 6-7 so 12,000-24,500mAh depending on cells you get...
So I live in an area with no high speed internet and thusly have to use cell data as my house's internet source. We have a separate line (and phone) that is solely dedicated to this purpose. So it basically just acts as a modem via USB tether that goes through a stationary laptop to a router (so it's not the phone's "native" wifi hotspot; the phone is simply USB tethering to the laptop).
I have a Pixel 2 that I retired a few months back because the screen started separating from the frame (this was only a couple months after receiving a replacement phone from Google right at the end of the 2 year warranty, so it was refurbished). I'm fairly certain that the screen separation is due to the battery swelling which obviously presents all sorts of issues, especially if the phone is still actively used/moved around regularly.
The phone still turns on and functions as it always has, however I didn't want to take the risk of keeping it as my daily driver, so I upgraded and now it's just been sitting in a drawer for months. Since the phone is newer/has faster connection speeds than the one we're currently using as our "modem phone" that literally just sits on top of the laptop 24/7, I was thinking about swapping in the Pixel 2.
The big question/concern here is safety. How probable is the "phone explodes/sets house on fire" scenario given the (assumed) swollen battery if I use it solely as described? I was hoping the fact that it's not being moved around/taken in and out of pockets and the fact that it will just be receiving cell data and providing USB tethering (with screen turned off) would minimize the risk from physical impact/heat but I obviously want to be certain before doing anything
Li's if they internally short out can make a mess. The swelling could cause internal disarrangement leading to a short. Who knows?
If you ever stuck one in a fire you get the idea. Sometimes the don't do much but often they turn into a flying little white hot fireball. Lithium burns much the way magnesium does but is more reactive.
So... are you feeling lucky?
You could try replacing/removing the battery (not sure if it would work with just extarnal power source but you could try that too).
blackhawk said:
Li's if they internally short out can make a mess. The swelling could cause internal disarrangement leading to a short. Who knows?
If you ever stuck one in a fire you get the idea. Sometimes the don't do much but often they turn into a flying little white hot fireball. Lithium burns much the way magnesium does but is more reactive.
So... are you feeling lucky?
You could try replacing/removing the battery (not sure if it would work with just extarnal power source but you could try that too).
Click to expand...
Click to collapse
Yeah I'm not trying to spend the $150 or whatever to get the screen/battery replaced, I'd rather just buy a refurbished/used equivalent at that point.
I guess my main question would be: are the cases of phones exploding/catching on fire really all that common or are they just sort of sensationalized a bit because it happened a couple times in a somewhat surprising scenario (i.e. phone separating from screen).
Additionally, is it possible/at all likely that my screen was separating for some reason other than the battery swelling? I don't remember having any sort of battery issues before I noticed the screen separating but now I'm too afraid to put it on charge to turn it on and test it lol
Watch a tear down on that phone to judge if you want to give it a shot.
You need to verify the battery isn't the cause.
If it still has good capacity it may not be.
Swelling isn't their normal mode of failure so if it's doing so assume it could be a hazard.
Thanks for the quick replies btw, I'm now charging it while keeping a close eye on it and I'll see if the charge holds and goes from there. For reference, here is the degree of separation (lol) from the side.
As an aside, I always kept it inside a TPU rubber/plastic type case that just wrapped around the edges of the phone and I'm wondering whether or not to use it to help keep the screen in place or if that will just be detrimental due to the added insulation/heat. But I guess that depends on whether or not I can determine if the battery is the issue
Keep it out of a case as that will increase to heat and stress on the battery.
It will probably be ok.
Just remember if the battery leaks it's very caustic.