have a mover,and have 2 batteries and always have one ready charged to change over after been in storage and prior to going away.i also have an alarm system and tracking system that drains the battery more than the mover.its just the initial start up of the mover which takes a little charge out of the battery after that as long as you are not moving it twice round the block and have no other devices that run off the battery it should not flatten in such a short time.caravan battery charges are of no use to charge a dead battery,you need to re charge using a leisure battery charger,you can use a car battery charger but it is not recommended on a regular basis as it can damage the battery