We have some extremely low-use batteries (used about 40 hours) left over from a temporary burning man project. They're all 12 volt, 6 amp batteries, lithium iron phosphate. Dimensions are listed as 5.9" x 2.4" x 3.6". 3 available, asking $15 each. Also have prewired standard DC jacks for them at $3 each, and carry case that will hold 3 at a time. Take it all for 50 obo.