i swapped my battery for a noco lithium battery, its supposed to weight 3 lbs or so and the factory is 13.5 or so. I went with there group 14 battery because it had plenty of amps and was cheaper and lighter than the goup 20. the noco battery comes with plastic spacers to ad for height to make it the right height and then one of the leftover spacers fit perfect along the side. fits nice and snug and starts up perfect in the 50 degree shop. we'll see what happens on a cold motor, but so far so good.