Antigravity AG-801 lithium battery. It measures 4.375" x 2.37" x 3.75" and weighs 1.56 lbs. It can hold a charge for up to a year with no parasitic drains, mounts in any orientation, has large brass terminals and no acid or lead. Adhesive foam is included for mounting. 3-year warranty.
NOTE: Lithium batteries can be shipped GROUND only, no air freight!