The ROCKSOLAR 12V 18Ah is a small deep-cycle lithium iron phosphate battery with a built-in battery management system. It is rated for at least 3,000 cycles at 100% depth of discharge and weighs about 2.1 kg, so it is easy to carry and install. Its 30 A maximum discharge and 50 A ten-second peak suit light loads such as fish finders, camp lights, small pumps and backup power, not high-draw inverters. Against lead-acid batteries of similar capacity it lasts far more cycles and holds voltage better under load, but it costs more up front and needs a LiFePO4-specific charger.
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Rated 4.8 out of 5 from 71 ratings, buyers are largely satisfied. They like the light weight and steady power for small electronics. Some note the modest capacity and the need for a compatible charger.
This is a rechargeable 12V deep cycle battery that uses lithium iron phosphate (LiFePO4) chemistry. It has a built-in BMS. Its nominal voltage is 12.8 V and its nominal capacity is 18 Ah, which gives a nominal energy of 230.4 Wh.
It is rated for at least 3,000 cycles at 100% DoD, tested at 0.5C discharge to 70% of initial capacity. The estimated usable energy is 218.88 Wh, calculated at 95% of nominal energy. This is an estimate, not a rated usable capacity, and actual delivered energy depends on operating conditions and any conversion losses.
For solar charging, use a compatible solar charge controller set to this battery's charging voltage and current limits. Do not connect an unregulated solar panel directly to the battery. Charge only within the 0°C to 45°C range.
