inputs.text: use lose - buy charger use lot keep plugged not using use casual use say one two times year unit gets completely drained power likely not able recharge like several posters used charger successfully first bought used less 15 times unplugged 6 months charge blue lights flash batteries not hold charge charging going 20 hours generate heatmy guess faulty power managehement circuitry problehem deviceif little heavier might able use boat anchor