My battery is wonky, running out of charge randomly

My battery is wonky, running out of charge randomly My battery is wonky, running out of charge randomly and then if i turn it on and back off it will suddenly be back to 1, 2 or 3 green dots. This can happen mere minutes after charging it. It won't really charge properly either, it the three LED's all light up without the "pulsating 1-2-3" animation when plugged in.