I have an ACE CVC (constant voltage charger) that I'm pleased with. It has two advantages over the wall wart that came with your battery. It has an LED that tells you when the battery is charged and the power supply is larger and does not get as hot. You can leave these on charge all the time because the amperage drops as the battery is charged but if you don't want to just put it on a 110 timer which you could do with your wall wart as well. After it is charged just give it 30 minutes a day and it'll always be topped off and ready.