i just picked up a 2100 mah and i have noticed a HUGE difference. I had the extended battery when i had my 6700 and when i got the 6800 i knew it wouldnt be complete till i got one. Like 51 cards i was going to wait to get the siedio but found somone in my local area who was selling a new one for 25. IMHO it is worth the $50 if you're going to get the 2100 or the $65 if u get the seidio. I have the 2100 and run bluetooth, im, texting, long phone calls and battery has lasted me a day and a half. To some that may not be long but for me i was either constantly charging it or it would die if a few hours....
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