i have a psp slim...i always worry about leaving my psp recharging all night while i sleep 'cause maybe overcharging it will damage the battery....so while at the middle of recharging,i took off the power cord so now it's running on battery, i turned it on and looked at the battery information...it says it's charge level is 100%...but before i took off the power cord the power light was still red...does this mean even though it says 100% charge level it's still not fully recharged if the red light is still on?