PB battery dead

No matter how long i keep them in the Powerbook for recharging, the indicator LEDs only blink one light when I press the button.
Christopher Scott wrote on :

I've got a few batteries for my Pismo PB that have been sitting around for eever, No matter how long i keep them in the Powerbook for recharging, the indicator LEDs only blink one light when I press the button.

Are these dead? I thought that a dead battery was indicated by two blinking LEDs... if they aren't dead then how can I get them to recharge?