I was asking this myself today if the batteries will last longer when you use your Mighty only while charging. I would fully charge it and unload the batteries one or two more times and you are good to go again. Just dont let the batteries fully drain all the time. e: Sry misunderstood this. Dont let your mighty be fully charged all the time, same as you dont let it drain completely all the time. Just stay between max and 2 bars and sometimes unload it entirely -> according to S&B this is the most conserving way for your batteries.