Electrical issues

[G raisin]

it started out with clicking when I try to start it, so I charged the battery and now whenever I turn it over, it cranks for a second then does nothing, no sound or anything. Anybody know what's going on here? Batteries pretty new

 

[G raisin]

it started out with clicking when I try to start it, so I charged the battery and now whenever I turn it over, it cranks for a second then does nothing, no sound or anything. Anybody know what's going on here? Batteries pretty new

Update: just went out and checked voltage, it's down to 11. Something, this is the second battery I've gone through. What's killing the battery?