Currently my Griz has a walmart battery from the PO. I've owned it 3 years with no problems until last week when it clicked a bit before finally starting. Charged battery overnight and keeping it on trickle charge since. With deer season coming soon I've been battery shopping proactively. I believe an AGM battery is probably the way to go for me, but being a frugal guy I'd like to find the best bang for the buck.