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Really you should charge the batteries separately anyway. What's the amp hour rating for the 2 batteries you have for the auger?Rg
Try a lawn tractor battery--- ATV batteries don't seem to last and are very expensive compared to a lawn tractor battery.
You want a deep cycle battery and a stepped charger. The thinner plates of a starting battery can not handle repeated deep discharges that the auger will do. If every thing is working as it should, a larger charger will recharge the batteries faster (with in reason) and will not hurt the battery... A Charger "drives" voltage and just make the amperage available to the battery.
Well, that's why I asked. You can get a 55ah SLA if you want to, but do you need it? You need to know either, what the existing batteries are or the amperage draw or horse power rating of the motor. Also, how far from the back up battery will the auger be? What type of # 10 wire are you using? My point is why carry a 60 lb battery if you don't need to.Rg
At that rating the motorcycle battery might be an affordable option. I'd look for something with about a 20ah rating. Good luck. Hope it works for you.Rg
I know they're a bit pricey, but last year looking for deep cycles, a lot of guys suggested wheelchair batteries, I guess they pack the most punch in a smaller package. Plus they're usually always AGM and sealed, great for travel. Remember to always slow charge deep cycles with an automatic charger that will not over charge usually on a 2 or 4 amp charge.Something like this I would suppose: (Image removed from quote.)