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The RVS Banshee is a 12.8V, 100Ah lithium iron phosphate (LiFePO4) battery built in a slim case for tight spaces like under seats, in cabinets or on a van wall. It delivers 100A continuous discharge and includes Bluetooth, so you can watch state of charge, cell balance and temperature from a phone app. That built-in monitoring is the feature most rivals at this capacity leave out or charge extra for. It suits camper, marine and off-grid users who want a drop-in upgrade from lead-acid with more usable capacity and a longer cycle life.
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Lowest price we've seen: $599.88 on Nov 9 at Newegg. Tracked across 1 store since Nov 9.
Owners like the slim shape and the phone monitoring, and most report solid run time in vans and boats. Complaints center on the Bluetooth app dropping out and on cold-weather charging limits.