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Seidio just posred pics of what the evo will look like with the 3500mah battery...

wow. How does that work?. How long will that battery last?

The correlation between the increase in mAh rating and operating life, is usually ~1:1, "given similar usage patterns"...e.g. if their is a 25% increase in mAh, battery lasts 25% longer, 50% mAH, 50% longer, etc, etc. My 2100mAh Seidio was ~40% larger than my OEM 1500mAh Moto Q. The Q would last about a day and a half "with my normal use", and a full 48+ with the Seidio. So if this a little over 2x the stock battery, and your getting ~24hours, you'll probably be able to go 2 full days before putting it on the charger. Or realistically, pull off the charger Monday morning, and plug it back in Tuesday eve....YMMV.

FWIW, I took it off the charger on Monday morning, and it still has 30%+ charge as of right now (Thurs afternoon). Its pretty much been idle, as its a backup phone, connected to 3G, and polling (3) POP3 accounts every (2) hours.
 
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