It seems that laptops don't always have enough oomph to fully charge EVO batteries. I've had them plugged in for hours and hours but the charged light never comes on (the LED tip of the battery for EVOs). I've tried 3 EVO batteries and two laptops and they all have the same problem. They still charge but I cannot tell how much.
After reading another post about USB pass-throughs being more powerful from the mains, I tried recharging an EVO via a USB hub which happened to have a separate mains adaptor (and without the hub even being plugged into any computer). This worked fine; with all three batteries the LED did finally come on after a while.
I can't say if USB ports on desktop computers are okay 'cos I don't have one but if, like me, you only have laptops, then I recommend getting some kind of mains powered USB adaptor.
After reading another post about USB pass-throughs being more powerful from the mains, I tried recharging an EVO via a USB hub which happened to have a separate mains adaptor (and without the hub even being plugged into any computer). This worked fine; with all three batteries the LED did finally come on after a while.
I can't say if USB ports on desktop computers are okay 'cos I don't have one but if, like me, you only have laptops, then I recommend getting some kind of mains powered USB adaptor.