Compared across 3 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission. Price via Klarna.
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The Mastervolt RB300 is a 12V 300Ah lithium iron phosphate (LiFePO4) deep-cycle battery built for marine, RV and off-grid power systems. It stores roughly 3.8 kWh and weighs about half what a comparable lead-acid bank does, and it accepts charge much faster. Its M8 threaded stud terminals and Group 31 footprint make it a drop-in candidate for many existing battery boxes. Against flooded or AGM banks it delivers far more usable capacity and far more cycles, but it needs a lithium-compatible charger and a battery management system, and it costs far more up front.
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Lowest price we've seen: $2,499.95 on Nov 10 at TWIST. Tracked across 3 stores since Nov 10.
Owners of Mastervolt lithium batteries generally report strong, steady power and long service in marine and off-grid use. Complaints center on the need for compatible charging gear and the price relative to lead-acid.
This is a 12 volt, 300 Ah deep cycle battery that uses lithium iron phosphate (LiFePO4) chemistry. It is a Group 31 battery with an ABS case.
It has M8 threaded stud terminals on top. It typically weighs about half as much as a lead-acid battery and charges much faster than traditional lead-acid batteries.