I just ordered the 2150 mah HTC battery and this cover...

[BillJr106]

Its the HTC branded 2150 battery, so it should add about 40%... from what Battery Boss said in their ratings, this battery achieved 100% of its advertised power rating, so I expect to go from 6 hours heavy use to 9 hours heavy use... 14 hours moderate use to 20 hours moderate use... and 26 hours light use to 38 hours light use... so long story short I expect to get a day and a half of use out of this thing before even thinking of a recharge... I guess only time will tell if the added bulk kills me... but ultimately I am sick of these phones having such amazing features and the battery life dwindling down to crap... give me a phone that goes a solid 2 days without recharging so I never feel that I cant use my phone in an emergency...