Josh, The HP 110 uses the same ac adapter (8V AC) as the hp 41, 71b and 75 series. Those are also used for some hp peripherals. I got lots of them but am on the wrong side of the big water. But it shouldn't be too difficult to get one. The batteries of the hp 110 are sealed lead acid types, they have a very long lifespan (when keeping charged) but are sensitive to longtime storage without charge. -Rik Van: Josh Dersch