Could I be right in thinking that using a battery charger to recharge a run-down car battery tends to reduce the life of the battery? On more than a couple of ocasions, car batteries I have owned have not survived long after I have used mains plug-in chargers to recharge them.
The reason the batteries needed charging was not due to any fault in the battery; it was due to the cars having ben standing, undriven, for a long time.
Thanks,
Hank