Riley_hatzic

I have a problem with a battery. I have a m18 5.0 battery that when you hit the power indicator it blinks with one bar (indicating it is dead). Obviously there is no power to make any tools work with it. When you plug it into the charger the light (on the charger) comes on as green but the battery is dead. left it on the charger for a hour to see if it would charge while on green unfortunately it did not. It is not the charger as it still charges the other two battery I have they charge normally and I have a second charger and it gives the same symptoms. The battery was bought about 8 months ago. Any suggestions on how to fix this? Preferably with out buying a new battery.