Used Battery Monitor Widget Free by 3C to monitor 3 brands of batteries including stock for about 2 weeks each. My EVO V 4G: Gold battery: AC: 2h34m USB: n/a 100->: 6h52m Historical data mV: 3023-4348 % 0-100 Original: 2450mAh In-use: 2450mah Measured: 1537mAh Aging: 10% +-10% *not sure what this line means?* Stock battery: AC: 3h19m USB: n/a 100->: 13h37m Historical data mV: 3348-4348 % 0-100 Original: 1730mAh In-use: 1730mah Measured: 1720mAh Aging: 1% +-13% *not sure what this line means?* Gold battery link: Amazon.com: Gold 2450mAh Battery for HTC EVO 3D G14 G18 G21: Cell Phones & Accessories Girlfriend's EVO V 4G: Stock battery: AC: 2h32m USB: 6h08m 100->: 7h20m Historical data mV: 3280-4346 % 0-100 Original: 1730mAh In-use: 1730mah Measured: 1690mAh Aging: 0% +-24% *not sure what this line means?* White battery: AC: 2h35m USB: n/a 100->: 19h03m Historical data mV: 3320-4205 % 0-100 Original: 1920mAh In-use: 1920mah Measured: 1812mAh Aging: 0% +-16% *not sure what this line means?* White battery link: Amazon.com: Onite 1920mAh Li-ion Battery Standard Backup Spare Extra Power Replace Replacement For HTC TITAN / HTC TITAN II / HTC EVO 3D / G17, HTC Sensation / G14, HTC MyTouch 4G Slide: Cell Phones & Accessories Before I knew about BMW I was using the white Onite battery in my phone and noticed I had more life than stock, but I haven't had a chance to test it on my phone yet. Just my gf's phone this time. I'm still new to this app so let me know anything I should tweak or provide.