Yes, that's fine. The PSP can charge even if left on, and even if being played - it will charge faster than the battery will deplete due to being used.
Yes you can, the PSP battery will continue to charge even when you are playing. I would not recommend to do that, it is better if you leave it to charge and then play.
yes cause you can play ds and dsi while charging
Depending on the make of your psp,the psp 2000,3000, and the psp go can be charged via a usb charging cable. I think the psp phat can be charged with a different usb psp cable that plugs into the AC socket But you have to remember your psp must have some battery power remaining to choose this usb charging option. http://www.gamesnsounds4u.com/how_to_charge_psp_via_a_usb_charging_cable.html There are car chargers for psp,which you plug into a cars cigarette lighter socket. External battery chargers and psp charging docks. http://www.gamesnsounds4u.com/alternative_ways_of_charging_psp.html
The Psp unit itself comes with a charging wall plug unit that allows you to play it directly off your homes electricity while charging its battery at the same time.
yes you can charge a psp off a ps3. put the psp on USB connection mode, then connect it in a ps3 with a USB cable, there your psp should be charging.
It takes about 2 - 3 hours for a full charge
if you charge your psp until the orange charging light goes off it should last longer but if you are using the internet on your psp your battery life will die even faster than normal.
game stop
All rechargable batteries (they're in everything) have limited life spans. Normally about as long the warrantee I find.
If you have residual charge on the battery to power it on and updated to the latest version of firmware for your PSP, certain PSP models are able to charge over a USB connection - but it may stop charging if you try playing a game on it while doing so.
The 'Power' LED will be lit orange.
Yes