Look, 1 finger and full arms length. 1000 cranking amps and 4 times the life of a normal battery. It has a little computer in there so if you leave the car sitting or leave the lights on it will turn off and then you press a button and it will have kept enough power to always start the car. Sealed and as it isn’t lifepo4 it is safe and works with normal alternator. Not cheap but 3kg is sooo light.