PKRWUD any ideas?

[DemonGT]

ok this is what happend

i was going to drive my car to work but when i got in it and tryed starting it it wouldnt turn over...battery was dead..didnt even click click...then a day later i had the battery charger ready to go but i thought.."wonder what would happen if i tryed starting it" so i did and when i turned the key on all the dash lights worked cd player came on ...car started right up no prob...checked batt. terminals..there tight...wires look ok....no sign of weak battery...battery is only mabe two months old..and with brand new terminals...iv heard of dead batterys recharging a bit if you let them sit but this thing is like it was never dead and there was nothing left on or anything ..why would it be dead like that then not at all?