I've got a Sears DieHard Portable Power 1150 unit. It can be used to jump
start a car, has an air compressor, and even a small inverter.
Does it make sense to always have the unit plugged in and charging
constantly or to charge it to 100%, take it off the wall outlet until I use
it and then charge it again? The instructions say to charge the internal
battery every 2 or 3 months -or- leave it permanently connected to the AC
wall outlet.

Just wondering if one way might prolong the internal battery more than the
other.

Thanks,
Walt