Very easy to use, to charge battery, car, motorbike or boat. (6 and 12 V) charging very simple, provide long cooldown (ideal at least one night) but very effective. most: battery let up with its connection; possibility of leaving small connector between battery and charger on the battery. charge indicator still visible LED. lack can be a mini extra cable, leaving the battery when charging several batteries: for my self + Sailboat case. automatic system shutdown and auto charge termination.