Hyperion AT&T Samsung Galaxy S II 4G 2 x Battery + Charger

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Just ordered at Amazon for $25. Batteries are 1800mah. Not many reviews but all are saying that there are NO boot loops and that they work with original back cover. My guess is that these are NOT NFC batteries. They should last at least as original battery. I'll update post when I find out.
http://www.amazon.com/Hyperion-Samsu...308449&sr=1-12
UPDATE
I tested my Hyperion batteries and they have about 5% LESS juice compared to stock battery. Another gripe is that charger output is rated as DC 4.2V 350mA (but mostly performs well below) so because of that, in my case, it takes 6+ hours to fully charge completely discharged battery. Some people reported 4 hours to fully charged state so each to it's own. If you charge phone thru charger's USB output you'll get full 750mA charge.
Anyway, considering all positives, negatives and price, I'm satisfied with this purchase and this is viable option for I777.
Positives
- no boot loops
- same form factor
- charger charge stock battery as well
- price (2 batteries and charger $25)
- extra USB output outlet (750-800mA)
Neutral
- batteries hold close to stock (it was expected knowing that weigh and size of batteries don't differ much compered to stock)
- not NFC compatible (not much of use for NFC right now)
Negative
- slow battery charging (~350mA)
- batteries hold ~12% less then advertised (~5% less then stock battery)
- once it gets below 20% it drains faster. Especially true for last 10%.

Maybe it'll get better over time. If someone found a way to properly calibrate this battery to show full potential, don't be shy, let us know.
http://batteryboss.org/

UPDATE 2
See post #14!

I recieved these batteries/charger last Tuesday. The batteries work fine, seem to hold close to the same charge as the stock battery. Charger works fine with both stock and replacement batteries. No NFC. They actually seem just very slightly thinner than the stock battery, I'm certain they couldn't possibly rate a full 1800mah. Either way, I'm cool with it...between these two Hyperion and my two stock Samsung batteries, I have completely stopped worrying about battery life and I can enjoy my device.

Thanks for heads up! I'm looking to have same experience with these batteries. And I'm glad to hear that charger works with stock battery as well.

Originally Posted by dgold21

I recieved these batteries/charger last Tuesday. The batteries work fine, seem to hold close to the same charge as the stock battery. Charger works fine with both stock and replacement batteries. No NFC. They actually seem just very slightly thinner than the stock battery, I'm certain they couldn't possibly rate a full 1800mah. Either way, I'm cool with it...between these two Hyperion and my two stock Samsung batteries, I have completely stopped worrying about battery life and I can enjoy my device.

I can just confirm that everything previously noted above stands true. No surprises here.

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So there isn't any extra battery life with this battery compared to the stock battery?

-Funk

Originally Posted by thefunks67

So there isn't any extra battery life with this battery compared to the stock battery?

-Funk

No there isn't. At least I didn't notice.

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Does 1800mah hyperion battery last longer than the stock battery ?. What is the certain hour for that and btw mugen & hyperion battery which one is better ???. Mugen seems to be expensive...

Originally Posted by doantuankha

Does 1800mah hyperion battery last longer than the stock battery ?. What is the certain hour for that and btw mugen & hyperion battery which one is better ???. Mugen seems to be expensive...

Friend of mine got Mugen battery. I gave him one Hyperion for test purposes. He was so mad because they lasted the same. Man, if you wanna preserve same form factor and save some $ buy either stock or Hyperion. For me, there is no question about that.

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I've been cycling between the hyperion batteries and my stock battery for the last few days.

I've noticed that my battery life drops twice as fast with hyperion vs stock. Has anybody else noticed this? Usage is the same and I'm running CM7.

Is this some weird calibration issue and the battery actually has more than is reported?

I think it's the hyperion batterys, i bought one a few Weeks back but its 8% lesser battery life then stock atleast for me..

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