MBP battery troubles

hi all,

i removed my battery last night and apparently my macbook pro is now refusing to charge it... it will run with the ac adpater plugged in, but the battery isn't charging (it just been saying it's at zero percent charge...)

i tried removing and putting back in the battery, and for a while it would just go back to saying "0%"

also the green indicator lights on the battery aren't lighting up...

i dunno what to do -- help? please?