Best battery for the best price for your S3!
599243
My Galaxy S3 phone battery had run it life cycle and I needed a replacement fast! This was the best quality replacement for the best price I could find. So far my phone's battery life has been awesome and is holding a charge longer than my original battery ever did. If you're looking for a replacement for your end of life S3 original battery this is what you'll want to replace it with.
1659852
it is well worth it! I have a Galaxy S3 that's about 5months old and my battery only lasted about 10-12hrs with heavy use (emails,text,youtube movies) and in my line of work I am in grocery stores stocking wine all day and a lot of the times I would be at around 15% but couldn't get to a charger and i didn't want to leave my phone in the car charging, I found  this battery and did some research and ordered it instead of a charging case (only add an extra 2200MAH) and I am getting over 2 day's use before I have to charge it (seriously). The hard part is the break in period which is 5-6 days and you have to let it charge for 10-12 hrs each charge, if you can live with out your phone for a few hours like I can it's no big deal but for those if you that your phone has become part of your hands it will be a test of your sanity and that's not a joke for some people. It's comes with a free case and a 2 yr warranty and some people  on youtube said they got a defective battery and Hyperion sent a new one asap and even with some of the cases they were damaged and Hyperion even sent and extra one (that's my kind of company). It doesn't effect your camera and in my case I almost seem to get a stronger data signal but that could just be me. Get it if you are tired of having to charge your phone all the time it's well worth it.
659592
This is probably the best Galaxy s4 battery replacement I have ever bought !! Battery life is extended and I dropped it in water for 20 seconds and still continued working like new!
1934447
good replacement battery for my unlocked S3 mini.
3904729
This is like a 3 in 1 battery.  Shipment was fast and well packaged with instructions.  The case is solid and surrounds the Galaxy S3 snug.  With the battery, the weight is a bit heavy and why I dropped a star.  If I could drop 1/2 star, I would.  The battery came with 50% life.  I let the battery drain down and charged to 100 %.  Many people mentioning only getting 50 or 70% life may not have set the baseline of the battery.  You need to let it drain all the way down.  This allows the battery to fully charge.  Once charged, the phone lasted 2 1/2 days.  I do not have many people calling or texting but I do use from time to time streaming video's and social media.  I tested these apps and did not suck the battery dry in one sitting.  When I charged the second time, it took 8 hours to get up to 100%.  Although I am not a fan of charging all day, I will probably just charge at night so I have a full charge when I wake the next morning.  By doing this, I should maintain my charge every few days and maintain usage of my phone when I need it.  Thanks.  Great Product
1773470
When I purchased the S3 I was hoping for great battery life, I got what I wanted, but only by turning down the brightness and using power saving mode. With this battery i can keep the phone set at 100% brightness and have everything running and get 2 days out of it. The cover does not add that much more thickness to the phone and I have had compliments on how the cover looks. Would highly recommend to anyone who ever worries about their phone going dead when they need it!

Edit-8/28/12-After using the battery for awhile, it does not last as long as it did after purchase. I still get about 18-20 hours of battery life, but that is only with power saving on and 1-2 hours of screen time. Still better then the OEM battery but not as good as it was.
3738655
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Bastex Battery for Samsung Galaxy
611248
This battery is a real beast. My phone is able to last for over 3 days on a single charge. I normally have to try to kill the battery to get it to 0% before doing a full recharge. I feel completely comfortable taking my phone out with only 20% left. I would give 5 stars but even though the battery has more power than any other battery for my phone, there are a few downsides to using this battery. Having to use the custom case causes the S5 to lose it's water resistant quality. We all know how popular that feature is (the S6 didn't have it but Samsung decided to bring it back for the S7). The battery itself and the custom case covers the speaker. This causes listening to music through the speaker, using speakerphone and using your phone as an alarm clock to be muffled and very low. When using the speakerphone, I have been told that I sound muffled as well (appears that the microphone doesn't have proper clearance through the case). Another downside is that the phone weighs about 3 times as much with the battery and case. The increased size of the case and belt clip can cause the phone to hit and get caught on things. I sat in my car the other day and the case flew off when it hit my seat. My final complaint is that while the belt clip allows you to clip your phone with the screen facing away or towards you, it is difficult to clip the phone in with the screen facing you. Personally, I don't want my screen facing away from me. It opens the door for the screen to get damaged as well as others to see when my screen lights up. While I have a handful of complaints, it doesn't change the fact that this battery is a monster that will not let you down, ever. If you ever get tired of looking for a charger or being stressed out about your phone making it to the end of the day, grab this battery.
1335383
This product is 100% an authentic product from Samsung Electronics, brand new. This is a life-saver because even though the Note 3 has great battery life, Power Users like me tend to run out of battery by the end of the day. With this spare battery, I don't have to worry about dimming my brightness or using my phone less when I'm going out, I can now just switch to a fresh battery and go from 0% to 100% in 5 seconds! My friends are all jealous when all of their iPhones are dead by the end of the night, I'm still at 100%. :)

The quality of the white case is excellent of course, since it's an authentic Samsung product. I think it's so worth the money, and plus Amazon sells it about $15 cheaper than the Samsung website. If you have a Note 3 and will have it for a long time, I highly recommend getting this as a NECESSITY for your phone. It's sad that starting with the Note 5, Samsung has decided not to include a removable back cover and battery so once the phone is dead, it's dead. You HAVE to find a wall to charge it. I'm disappointed with that decision, but I love my Note 3 even though it's getting more and more outdated it's an excellent phone. Get this Extra Battery Kit!!  promise you will not regret it!!
2189671
Battery and back cover fit my Samsung galaxy S3 phone perfect. Battery lasts almost 2 full days on one charge. Very happy with this purchase. Bought a new oem battery right before I bought this battery and the oem would not even last a full day.
3140941
I have tried the other two brands avaiailable in amazon, and they are no where near the performance of this battery. I charged my phone on Sunday morning; it is tuesday afternoon and I still have some charge left (15%). THis battery is amazing. I will update this review after a few weeks of use/testing to make sure it continues to perform amazingly.
2614672
I switched from the original 2100mah stock GS3 battery to this not long ago. The difference is substantial. I can easily get 2-3 days of life on one charge. And those days include constant instagram, twitter, and vine usage, along with playing a few games, watching videos on youtube and netflix, and texting friends frequently. My phone is now fairly heavy and thick, but I have no problem with that since my battery life is astronomical. I would highly recommend this battery to anyone who needs a good boost out of their GS3.

Pros:
- Battery life is fantastic
- The case holds the battery on the phone perfectly
- The smooth backside of the case makes for easy entry and exit from a pocket

Cons:
- Phone ways quite a bit more than it used to
- It's also quite a bit thicker
3749022
Best price for my MacBook Pro battery (this is maybe its third?), and the battery life is the best by far.
3232589
Couldn't find a better deal if God himself (or herself!?!?) came down and met me on the top of Mt. Sanai!!!!!  I've put about 25-30 runs throught these batteries and they rock!! I got my friend to get them too and he loves them. He bought some other batteries from Ebay, and they don't last as long, or have the punch. Another friend bought the really expensive 4500mah batteries from the store and they are comparable to these. But for the price? Forget it. I love them!
4739129
This Battery is simply superb!
I bought this before I knew I was going to be using it everyday because at the time I just wanted a form insurance that my phone would have power in potential emergencies. I began to use it continuously when the PokemonGo app came out and boy I have not had my phone die on me once. I am not disappointed at all, I let it charge while I sleep because otherwise it takes a while to charge, considering it can recharge my iPhone 6s around 3-4 times without dying this takes the cake. I wouldn't say you need this to play PokemonGo, Anker has plenty of portable batteries for different purposes and has come to earn my trust on their brand, which I do not do on a cavalier fashion. Great Battery, great experience, great brand! I find myself wearing cargos all the time to accommodate this battery, I never run out of juice!
3839392
I bought this to replace an overcharged battery in my Samsung galaxy s2 and its been working great! My phone actually makes it through a full day now. Shipped quickly, and have the extra bonus of the backup battery.
707102
The battery comes fully charged but when you put it in your s3, it only reads that it is at 70 % charged.  After you try to charge the battery while it is in the phone it still reads 70% charge.