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