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Beware of fakes. Positive reviews may not apply to your product.
on 17 November 2014
And conversely, this negative review may not apply to the product you're looking at right now.
Amazon reuses reviews across products with the same product number, and so it may display this review with "EB-F1A2GBU" batteries that are indeed authentic. But beware before you accept a number of good reviews as "proof" that the cheap battery you're looking at is indeed authentic.
My battery was bought from HIY Tech in August 2013, in order to replace a broken original one in my GS2. It cost £6.69. Which isn't even THAT cheap.
I used it for a short while, but it proved to not help with my abysmal daily battery life, so I eventually concluded that it was phone that was broken and decided to buy the Note 3.
My conclusion was wrong.
Today I decided to use the phone as a test device for development and was immensely surprised to see that it was actually losing juice while being plugged in to my USB port allthewhile claiming to be charging. So I started investigating, and eventually started to more closely examine the authenticity of the battery. And by more closely I mean even more closely than what I did when I received the battery last year. Back then I scrutinized it against the one already in my phone and deemed them to be a match. It also looked exactly like the product pictures here.
I read about different tips on how to detect a fraudulent product, and while quite a few are nonsensical and/or just plain misinformation, some of them are not.
I believe I may not link to other sites, but if you google "How to Identify the Original and Fake Cellphone Battery" (quotation marks included) you should be able to find an article that suggests that you try tearing off the wrapping label at the back of the battery to see what's underneath. The three examples in that article shows the original battery which has an NFC chip covered entirely by clean black plastic, a fake one with an improperly exposed chip, and another fake one which doesn't have an NFC chip but exposes a glued-up metal sheet instead.
My battery is of the third kind.
Removing all doubt, the metal sheet has been printed in ink with:
Two things to note there, first of all the glaring "1500 mAh" which kind of disagrees with the "1650 mAh" printed on the Samsung label I just peeled off from it.
Second of all, the date. The label states, "2013.04.10" (they probably just print a big batch of fake labels and use them for some months) whereas this metal sheet's printing states a date AFTER that, namely 2013-06-05. That is, this battery was seemingly wrapped two months before being manufactured. (I believe it fair to assume that 13/06/05 is a date in short ISO format. It can't be American style, because that would mean the 13th month. Can't be European style because then it would've been produced many years before the phone model existed. Either way, if you disagree and don't think that that's a date, we're still looking at a 1500 mAh battery wrapped in a 1650 mAh Samsung label.)
Long story short: Don't assume a cheap battery (or even an expensive one if the seller sees an opportunite to fraudulently make even more money!) is in fact an authentic one. Don't assume either that you can necessarily identify it as a fake one when you receive it. It took me over a year to stumble across this fact after having been what I thought was "vigilant" when I received it, and I got "lucky" with such glaring contradictions revealed once I removed the label.
At the very least, strip off the label when you get it, be scrutinous, and if you discover a fake battery, report that dirty merchant to anyone who'll listen. I can't report my merchant, as it somehow disappeared. I wonder why...
EDIT: After having bought an official Samsung battery from a certified store, my battery life is tremendous -- I can get close to two days on this phone with very light use. With the fake battery I bought, I got a maximum of 8 hours.