If you're like me, you've been struggling to determine what battery to use with little information available. I just wanted to share that I purchased a Lawn & Garden Battery from Tractor Supply. The battery is manufactured by Traveller with a part number of TS/1B-U1L350. Hope this helps. I tried to use a LiFeP04 24ah battery from Amazon and instantly fried the battery. The Dolly itself...pretty awesome! I've only used it once, but it enabled me to put my 22' pontoon boat on the side of my house with no problems. My boat is on a driveway which is paved and mostly flat, but it moved it with ease. I'm guessing my boat is about 4K lbs? The reviews on this product (elsewhere) gave me pause on purchasing, but I'm extremely happy I purchased this....