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3000 vs 3500 MAH, which one?

Wondering which battery to get of them two, I've read some users saying that the 3500M battery is actually smaller than the 3000M which would indicitate it has less capacity? They've also said that it doesn't live up to the rated capacity in terms of usage time. I'm leaning toward the 3000M battery as it seems to have a better reputation. I also don't really want to spend more than ~$15 on the new battery.
Also, which one has a better feel to it with the cover?

I was bought this one http://www.batteryupgrade.com/shopB...rtmentProductId/42252157/shopGroupId/46205854
from renomierung distributer (know from many pasts ordering), and im very,very satisfacted.
Regards

Any picture of a battery that size in the sgs?

Hvala Miro. It's a bit expensive though.
I was thinking of one of these
http://cgi.ebay.com.au/3000mAh-Exte...Accessories&hash=item5add807a84#ht_4261wt_905
http://cgi.ebay.com.au/3500M-EXTEND...Accessories&hash=item4aa5e7292d#ht_1727wt_905

none of those batteries really offer the advertized capacities, probably the 3500 will give you a few hours more than the 3000 but expect them to be like 75% or less of their real rated capacity.

Some people have said in other threads that the 3500m one is actually smaller than the 3000, which should mean that the actual capacity is lower?

au_stevo said:
Some people have said in other threads that the 3500m one is actually smaller than the 3000, which should mean that the actual capacity is lower?
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My battery is like on yor first link for ebay.
I can tell you:
With original SGS battery i have 1 day to 1,5 day battery life (im relativ middle to stronger user,GPRS,GPS,3G,etc. But with this 3000 mAh battery i have last about 4-5 days. SGS is doble dicker from original,but i have no care if i go on shorter travel without charger
Pozdrav
Best regards

are the batteries sold for I9000 usable for samsung vibrant?

Pickup the quality: Mugen I couldn't submit a link since im new

au_stevo said:
Some people have said in other threads that the 3500m one is actually smaller than the 3000, which should mean that the actual capacity is lower?
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Click to collapse
I purchased both from e-cell in UK. They look pretty much identical, the 3500 one has label only on one side and it's a little thinner. But they are higher capacity than the stock one, about twice the capacity.
Doing my usual test while communting on metro and train, reading news with screen at minimum brightness, with the standard battery I usually lose 20% in 1 hour, with the big battery I lose 10%.
The back cover is a little too big and there's a space between the battery and the cover, so it moves, I had to fill the gap with a piece of paper.

@vcespon
You have a 3000mAh and a 3500mAh battery?
Do you have now more experience in the differences?
Is here a owner of a 3000mAh Yoobao Accu?
It seems Yoobao is a "quality label"?!?
A comparison of budget 3500mAh and budget 3000mAh and Yoobao 3000mAh would very interesting.
Specifically, the running time for the same use (eg video loop).
The Yoobao battery costs three times more as the cheapest noname battery.
€7, the chepeast 3500mAh battery and €21 for the 3000mAh Yoobao.
Is the desk stand the only difference?

2 stock batteries together

Hi, after reading the post that says the majority of batteries in ebay are crap (less than 80% of the mah indicated) i've been thinking of do it by myself and put together 2 stock batteries (or 2 armani batteries) which will give to me 3000 real mah or 3300 real mah, anyone has done it? (is it possible?)
Will I find a back case with the double battery thickness?
sorry for my english.
Thanks in advance.

how about trying the 2700 battery?

I have the momax battery and it is excellent. But I have always wondered if you join 2 or even 3 stock batteries together would it be safe and usable, I don't know enough about batteries to risk doing this, but if anyone has any knowledge please share.

I've ordered a 3000mah battery from a website that sells upgrade batteries for a variety of devices, it comes with an extended cover. free shipping all over the world, dunno if I am allowed to post it here but pm me if you want the address

Yes please do post the address

Batteryupgrade.com
Sent from my GT-I9000 using XDA App

Its there any battery higher than 1500mah but thats looks exacly the same when it comes to thickness?? Its just that I dont like that fat battery with the horrible backcase =\
Sent from my GT-I9000 using XDA App

Thanks, but ordered from ebay instead, much cheaper for the same thing.

cubanito0389 said:
Its there any battery higher than 1500mah but thats looks exacly the same when it comes to thickness?? Its just that I dont like that fat battery with the horrible backcase =\
Sent from my GT-I9000 using XDA App
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NOPE Try momax nice design

Get the 2700mAh battery from momax. It's a good battery and comes with a nice back cover and slip case.

I would caution against meddling with batteries unless you really know what you are doing. An exploding battery is not fun.
I bought a 3500mAh battery from ebay, and so far so good. I'm not sure if its really 3500, but it seems to last pretty long. At the end of a day, I usually used to have about 30% left on my original battery, but on this baby, I still have at least 50-60% left. That's pretty good.
Assuming the battery readings are correct, that would put the ebay battery at twice the capacity ( 3000 mAh ), not 3500mAh. But for so little money, who cares ?

I use the 5A PortaPow USB rechargeable battery. Plug it in and it recharges the phone, or plug it in and use it while using the phone.
Saves any case mods. Still got a sleek galaxy S , and a little baggie with a 5A battery in when needed. It's about the same size as an iPod classic, and means I can GPS for hours and hours when out and about. 2 and a bit hours and it's flat on a 1.5A stock battery.
So with a PortaPow and a stock battery I've got 6.5A to resource.

ok, now i have a stock 1500mah, armani 1650mah, and the momax 2700mah (all the things are very cheap so.. jeje).
the momax 2700 is fine, i'm not really sure that this is real 2700mah but the case is nice.
I was interested in this cause if i can put together 2 1650 they will bring me real 3300mah that maybe is the best battery life you can get for this phone.
the 3500mah in reality it is two 1200mah batteries together, (you can find more info in this forum).
So, if they can put together 1200mah why not the 1650mah?.
I have tried the space in the momax case, and the 1500+1650 batterys doesnt fit, only for 1 millimeter (or less) but doesnt fit.

padlad said:
But I have always wondered if you join 2 or even 3 stock batteries together would it be safe and usable, I don't know enough about batteries to risk doing this, but if anyone has any knowledge please share.
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For normal batteries yes it would work, just. You don't get double the life though because the batteries would discharge each other while sitting idle.
However it doesn't work with Lithium batteries such as the ones in phones. These are not simple batteries, but rather lithium cells, a small amount of circuitry and an extra third terminal to talk to the phone's battery management chip. Over discharging, or over charging lithium batteries can cause explosions and the electronics protect against that. Because of these you can't simply hook them up in parallel, you need a battery with physically more cells (higher mAh number.)

Thanks garbz, well explained
so.. i will keep in my phone the momax and forget this thread xD

cubanito0389 said:
Its there any battery higher than 1500mah but thats looks exacly the same when it comes to thickness?? Its just that I dont like that fat battery with the horrible backcase =\
Sent from my GT-I9000 using XDA App
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Yes, there is a 1650mAh battery made for Giorgio Armani Galaxy S (which is known to be compatible with standard Galaxy S). Thats as high as you can go without adding extra bulk. You might find batteries rated even higher on eBay, but those are fake values.

Or you know... you could just use the two batteries sequentially, not blow up your phone, and not have a cinder block back case.

PhoenixFx said:
Yes, there is a 1650mAh battery made for Giorgio Armani Galaxy S (which is known to be compatible with standard Galaxy S). Thats as high as you can go without adding extra bulk. You might find batteries rated even higher on eBay, but those are fake values.
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This is an original Samsung battery. The Armani Galaxy S 1650mAh battery is also used for Samsung Galaxy S variant I9003. So it should be available now. I used it now for a while with my I9000.

Hi will the i9003 battery work in i9000?
Sent from my GT-P1000 using XDA Premium App

Yes, but not by much... momax just released one with 1700mAh, which goes along fine with the stock back cover.
cubanito0389 said:
Its there any battery higher than 1500mah but thats looks exacly the same when it comes to thickness?? Its just that I dont like that fat battery with the horrible backcase =\
Sent from my GT-I9000 using XDA App
Click to expand...
Click to collapse

Extended Battery Help

We need to find out if anyone has a battery that is bigger than 1500 mah. It looks like the Optimus 2x uses the same battery so I would hope someone has a 1650 or 1800 mah out there. Let me know if a source is found. It would be nice to have an external wall charger as well.
Sent from my LG-P999 using XDA App

Or maybe a dock with spare battery charger on the back to at least hold a stock battery to charge

Check on Ebay every few days. I haven't seen one yet but they make it for most phones. The batteries are thicker than the standard ones and it also comes with a different rear cover to accept the thicker battery. It is usually from China and around $15 or so.

grenademasta said:
Check on Ebay every few days. I haven't seen one yet but they make it for most phones. The batteries are thicker than the standard ones and it also comes with a different rear cover to accept the thicker battery. It is usually from China and around $15 or so.
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the optimus 2x has been out for a while, and there's nothing yet.. I agree.. probably will be out soon. too bad they can't pack more punch into the same size.. don't want to make my phone any thicker.. I'll have a case for it where it wont' fit in then..

schmit said:
the optimus 2x has been out for a while, and there's nothing yet.. I agree.. probably will be out soon. too bad they can't pack more punch into the same size.. don't want to make my phone any thicker.. I'll have a case for it where it wont' fit in then..
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Sometimes there are extended batteries made that are the same exact size as the stock one but have a larger capacity. For example, I bought a Seidio extended 1750mAh battery for my Droid X which was the same size as the original battery but had about 250 more mAh to it...it gave me a couple more hours on one charge. Hopefully something similar is made for the G2X!

Maybe a bunch of us should just write to seidio and ask them to start on developing one for us...

kentrik said:
Maybe a bunch of us should just write to seidio and ask them to start on developing one for us...
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Lol good idea...here's their twitter page: https://twitter.com/#!/seidioseidio

Seems kind of shady (these batteries are running for $5-10 a piece) but here's what I found, 1600mah, haha:
http://cgi.ebay.com/NEW-2x1600mAh-B...&ps=63&clkid=8677498459030269031#ht_675wt_936
http://www.rpasonline.com/pd-1600-mah-battery-for-lg-optimus-2x.cfm

If they make a extended batt That's the same size, ill def get it. I don't want a bigger one cause it will cause problems with my car and house dock.
Sent from my LG-P999 using XDA App

That's the nice thing about the Seidio ones. They are a legit company, and they can usually squeeze an extra 150-400 mAh out of the standard size battery. They aren't too terribly expensive, either. I am thinking for now, though, I may have to give one of those ebay ones with the separate battery charger a try....I have had good luck with ebay laptopt batteries, so....it might be worth the $20 for it.
Also, I will start spamming Seidio's twitter. Lol.

kentrik said:
That's the nice thing about the Seidio ones. They are a legit company, and they can usually squeeze an extra 150-400 mAh out of the standard size battery. They aren't too terribly expensive, either. I am thinking for now, though, I may have to give one of those ebay ones with the separate battery charger a try....I have had good luck with ebay laptopt batteries, so....it might be worth the $20 for it.
Also, I will start spamming Seidio's twitter. Lol.
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Seidio slim extended batteries are usually way lower than what they state. Just run a quick search on here...bottom line, you may as well use the stock battery in most cases.

kentrik said:
They are a legit company, and they can usually squeeze an extra 150-400 mAh out of the standard size battery.
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Actually, they just re-label their inferior batteries with bigger mAh numbers and make a big profit for their efforts.
No company has ever made a legitimate higher capacity OEM size battery ever.
I've spend hundreds of dollars on batteries just to rip them apart, document my findings and test.

rotohammer said:
I've spend hundreds of dollars on batteries just to rip them apart, document my findings and test.
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This is what I have always suspected. Can you give a link to a writeup of your findings?

aquariumdrinker said:
This is what I have always suspected. Can you give a link to a writeup of your findings?
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Click to collapse
http://forum.xda-developers.com/showpost.php?p=2097942&postcount=47
http://batteryboss.org/

Agreed. Seidio does make some legit extended batteries, like the 2500 and 3500 mAh one's they put out for the EVO and Droid X, etc... but the ones that are the same size as the stock battery don't hold any extra juice, they take advantage of the loop hole in the rules concerning how companies can label batteries.
Batteries have a range of mAh that they hold. Say the battery in our device has a range of 1300 to 1700 mAh, most companies will use the average and label the battery at 1500 mAh. Seidio on the other hand will label theirs on the high end of the range at 1700 mAh, which is perfectly within their right to do, but is rather deceiving to the consumer.

Outlaw71 said:
Batteries have a range of mAh that they hold. Say the battery in our device has a range of 1300 to 1700 mAh, most companies will use the average and label the battery at 1500 mAh. Seidio on the other hand will label theirs on the high end of the range at 1700 mAh, which is perfectly within their right to do, but is rather deceiving to the consumer.
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There is no range. All the OEM batteries I've tested were within 3% of their tagged rating.
Regarding Seidio, there is no explanation as to why their "same size & higher capacity" batteries consistently deliver less power than an OEM battery.
But don't let me stop anyone from buying their snake oil.
Regarding Mugen, that first link shows a disassembled 3000mAh battery that contained 2 1200mAh cells. I call it fraud, plain and simple. They all do it, I've proved it.

i just ended up getting this http://www.amazon.com/gp/product/B000N63AC6 . i have a body glove case and they're a pain to snap off everytime i want to replace my battery while at work. for me, this is much easier.
now if they made a good extended battery with a custom back cover like i had on my g1, i'd get it.

rotohammer said:
http://forum.xda-developers.com/showpost.php?p=2097942&postcount=47
http://batteryboss.org/
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You ever tested any of the batteries from htc express? Those seem to work well.

Currently I am using Veho 5Ah external battery while I am waiting for 2 more batteries.
With regular microUSB cable, it works fine.
http://www.jr.com/veho/pe/VEH_VCCA007PBP/
$35 isn't bad at all.

andonnguyen said:
Seems kind of shady (these batteries are running for $5-10 a piece) but here's what I found, 1600mah, haha:
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Definitely stay away from the 1600mah. I saw those and I emailed one of the buyers.. and asked him for his input on the battery b4 I made a purchase. He said "stay away, they are junk and only hold a charge for a couple of hours. save your money."

PSA: There is no magic that will cram more maH into an equal sized battery

It is sad, but true. All the ebay, mugen, seidio etc batteries that claim 1800/900/2000/whatever capacity are scams. same size battery = same capacity.
The best bet for additional capacity with the stock backplate is the evo3D stock battery, which is 1.5mm thicker and has a couple hundred more mah.
check out www.batteryboss.org
Notice a trend with every Non-OEM battery?

vivanshah said:
It is sad, but true. All the ebay, mugen, seidio etc batteries that claim 1800/900/2000/whatever capacity are scams. same size battery = same capacity.
The best bet for additional capacity with the stock backplate is the evo3D stock battery, which is 1.5mm thicker and has a couple hundred more mah.
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Click to collapse
Well the evo 3d battery is 3.8v and ours is 3.7v so that might mess up your phone.
And my extended battery not only is a tiny bit bigger but it also weighs more and gives me about 15 hrs a day.
If you can get the type of battery efficiency I get on a daily basis with normal usage then maybe I might believe you.
Sent from my HTC Sensation Z710e using XDA App

all phones have built in voltage control circuitry. 0.1v is not going to harm anything.
that is how phones can handle a stock battery going from ~4v to ~3v while it discharges.
3.8v vs 3.7v is just the nominal voltage of the battery. the voltage of the evo3d is higher since it's capacity is higher.

Well, sorry to rain on your PSA but I was running stock battery (and quite happy with the performance of the stock btw), I opted to try the Anker battery. With little to no expectations, I was really looking for an extra battery, so spending 12usd wasn't bad compared to my Seidio extended battery for my N1 that cost double of the Anker.
I was simply expecting stock performance and got a bit more than expected. Is it magic? Who the heck cares, it works!

kpjimmy said:
Well, sorry to rain on your PSA but I was running stock battery (and quite happy with the performance of the stock btw), I opted to try the Anker battery. With little to no expectations, I was really looking for an extra battery, so spending 12usd wasn't bad compared to my Seidio extended battery for my N1 that cost double of the Anker.
I was simply expecting stock performance and got a bit more than expected. Is it magic? Who the heck cares, it works!
Click to expand...
Click to collapse
if it works for you, more power to you

vivanshah said:
if it works for you, more power to you
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That's the point, no?
1000th POST LOL

kpjimmy said:
That's the point, no?
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haha yes, pun was intended. I'm curious: do you still have your stock battery?
Could you compare thickness with the Anker? if it is thicker, there's where your extra capacity is coming from.

vivanshah said:
haha yes, pun was intended. I'm curious: do you still have your stock battery?
Could you compare thickness with the Anker? if it is thicker, there's where your extra capacity is coming from.
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Yes the Anker battery is a smidge thicker, not much to the naked eye. As posted in another thread, it's slightly heavier as well. And that could account for a bit more capacity.

The Anker battery without a doubt lasts alot longer than the stock battery!

I don't think all these stuff matter as long as user experience/reviews with the batteries prove positive.

Blablabla..... Trash.... Delete.... Error...
Sent from my HTC Sensation Z710e using XDA App

vivanshah said:
It is sad, but true. All the ebay, mugen, seidio etc batteries that claim 1800/900/2000/whatever capacity are scams. same size battery = same capacity.
Click to expand...
Click to collapse
And what about a pentiline or normal AA battery that would fit in a mp3 player or kids toy or even a dildo? All same sizes and yet thy exists in different capacities?
Sent from my HTC Sensation Z710e using XDA App

he's absolutely right. theres a very large capacity differential between standard batteries of varying internal composition. easiest reference, test out a lithium ion battery versus a nickel cadmium battery (both come in AA), which are exactly the same size, and tell me theres no more capacity in one than the other.
Electrical capacitance, as we have seen throughout history has nothing to do with size, so the OP is arguing against the progression of physics. 50 years ago, a battery capable of powering a sensation would have been as big as a book, and yet they used that "magic" you were saying didnt exist to "cram more mAH" into a smaller battery.

Size means very little. Internal construction and quality mean everything. I have seen D cell batteries that are really a AA inside a D cell case. Perhaps the HTC battery is built the same? I dont know, nor do I intend to find out.
If you drain the battery at a constant rate (no, not with your phone, but with more accurate equipment), then you can easily figure its capacity. There is no arguing with that...The aftermarket batteries have been found to have MUCH GREATER capacity than the HTC battery. That is confirmed, 100%.
Matt

However it may be my ChiChiTec battery permits me to go a whole day without charging whereas the stock did not. That's good enough for me.
Sent from my HTC Sensation 4G using XDA Premium App

Stock battery is really crappy... I'm still waiting for a decent review about the aftermarket battery's

vivanshah said:
It is sad, but true. All the ebay, mugen, seidio etc batteries that claim 1800/900/2000/whatever capacity are scams. same size battery = same capacity.
The best bet for additional capacity with the stock backplate is the evo3D stock battery, which is 1.5mm thicker and has a couple hundred more mah.
check out www.batteryboss.org
Notice a trend with every Non-OEM battery?
Click to expand...
Click to collapse
I got the seidio 1900mAh EVO battery and it does weigh a bit more but worth the extra juice on heavy usage days especially with right rom
Sent from my HTC Sensation 4G using XDA Premium App

vivanshah said:
It is sad, but true. All the ebay, mugen, seidio etc batteries that claim 1800/900/2000/whatever capacity are scams. same size battery = same capacity.
The best bet for additional capacity with the stock backplate is the evo3D stock battery, which is 1.5mm thicker and has a couple hundred more mah.
check out www.batteryboss.org
Notice a trend with every Non-OEM battery?
Click to expand...
Click to collapse
you are an idiot.. no offence intended but you havent read any of the threads on here about all the batteries availaible.
QUALITY OF THE CELLS MEANS EVERYTHING!
crap cells wont hold high amounts of energy, they wont hold as stable a voltage under load and wost of all heat up more than a quality cell.
my anker battery does weigh 2g more than the stock battery and is 0.2mm thicker but that amount of extra mass gets me 4-5 hours more use over the stock battery and thats to do with the quality of the cells more than the exta weight and size.
my stock battery heats up a lot and fast under load and causes the whole phone to get stupidly hot. Anker battery DOES NOT do this at all and only the lower part of my phone gets hot.
some cheap batteries are crap, but there are plenty of good ones too.
if you still think same size = same capacity then ask yourself this, why are some batteries worse than the stock one yet still the same size? if some can be worse then some can be better .... Right???
heres a whole website of information about batteries you can disagree with if you like.
http://batteryuniversity.com/

Here is a size comparision between the stock battery (top) and the chichitec (bottom):

You guys are missing the point of the op. This is not about comparing 2 different battery chemistries. We are comparing an OEM Li-ion battery to an after market one.
The only evidence of an aftermarket battery ever being superior ( in the case that they are the same size and weight) has only been via anecdotal perception of the buyer.
If an aftermarket battery is larger/heaver, there's a chance it could out perform the OEM unit, but when tested using capacity measuring test equipment, It will usually test well below the label mAh rating, unlike the OEM cell which is usually within 3% of its labeled mAh rating.
That's not to say these batteries are not a good value for the money, they are. $12 for a replacement battery is a really good value, especially if its at least as good as the OEM unit.
The real snake oil is in the high capacity multi cell batteries, where the manufacturers have been caught (by me) to have intentionally over stated the mAh rating.
If you get better phone life from your 1700-1950mAh aftermarket battery, that's great! But I doubt you're getting more than 80% of the capacity that's stamped on the label.
I have not seen any independent tests of Sensation batteries yet, no less one that shows an after market battery delivering its labeled capacity.
After reading the many positive reviews of the Anker 1900mAh battery, I just ordered one. Lets see how it measures.

Extended battery with original battery cover?

Anyone found a descent (great) extended battery that still goes with our phone ? They got a few for the note 3 that I wish were also made for our phone!
I have seen a few on ebay but I find them hard trusting.

mgbotoe said:
Anyone found a descent (great) extended battery that still goes with our phone ? They got a few for the note 3 that I wish were also made for our phone!
I have seen a few on ebay but I find them hard trusting.
Click to expand...
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How is an extended battery going to fit under the original battery cover? Greater capacity means greater size.

Joey2o11 said:
How is an extended battery going to fit under the original battery cover? Greater capacity means greater size.
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Anything beyond stock is extended. Companies made them plenty for the note 3. I don't care for 10k or 5k for that matter. But I found one...mod can close / delete

mgbotoe said:
Anything beyond stock is extended. Companies made them plenty for the note 3. I don't care for 10k or 5k for that matter. But I found one...mod can close / delete
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which one did u get?

Any of those batteries claiming to be high capacity yet OEM sized are probably dangerous (Google cheap lithium batteries) and nowhere near the capacity they claim. If you want to risk your expensive new phone by sticking in some cheap nasty battery that could explode go for it.....

Yes, what Joey2o11 said is correct. A battery that's the same size as the factory battery will have the same, or less, mah as the factory battery. Any company claiming their factory-sized battery has more mah is simply lying so they'll sell more batteries. You can read where many different unaffiliated companies test batteries from manufacturers and 3rd parties, and you'll see the results are always the same. Bottom line - if you want more mah, you'll need a bigger battery.
Also, you made a thread asking the community to share info about batteries. So when you found one to purchase you should have shared your findings with the community, not asked a moderator to close the thread. XDA is all about sharing information with the community, not keeping it to yourself...

Not 100% true as I remember the higher capacity battery for my old Sony Xperia phone lasted longer than the oem battery even though it was stock size.

twe69 said:
Not 100% true as I remember the higher capacity battery for my old Sony Xperia phone lasted longer than the oem battery even though it was stock size.
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So no actual solid evidence then other than you seem to remember it lasted longer... If it was possible to make batteries with a higher capacity for the same size do you not think the likes of Sony, Samsung etc would have done it themselves in the first place?

Joey2o11 said:
So no actual solid evidence then other than you seem to remember it lasted longer... If it was possible to make batteries with a higher capacity for the same size do you not think the likes of Sony, Samsung etc would have done it themselves in the first place?
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I had the Sony Xperia Play mobile phone, the extended battery was quoted to be only 200mAh higher but made a difference. 6 months on the standard battery versus 6 months on the extended battery I could tell the difference. It was also talked about here on xda when it was the 'in' phone.
I do know that most batteries quoted are not genuinely that much higher or better than stock with the same dimensions but I can say that the statement was incorrect in my opinion from my experience for that one occasion.

twe69 said:
I had the Sony Xperia Play mobile phone, the extended battery was quoted to be only 200mAh higher but made a difference. 6 months on the standard battery versus 6 months on the extended battery I could tell the difference. It was also talked about here on xda when it was the 'in' phone.
I do know that most batteries quoted are not genuinely that much higher or better than stock with the same dimensions but I can say that the statement was incorrect in my opinion from my experience for that one occasion.
Click to expand...
Click to collapse
That phone was never the "in" phone and anyone who thinks any cheap chinese third party battery is gonna compare to a stock oem battery is delusional. They are expensive for a reason, even after you trim off the excessive markup.

That sums things up nicely

If there was a way for extra mAh to be crammed into the same space, Samsung would've done it themselves. And even if there was a way and some other company made such batteries, the production costs would be through the roof, so the retail price would reflect that.
The best you can expect from a cheap battery is to be on par with the OEM (although unlikely), but it's simply unrealistic to expect it to be better.