Photovoltaic Lithium LiFePo4 12.8V 50Ah Lithium LiFePo4 battery Smart, Victron

LiFePO4 batteries are the safest lithium ion batteries on the market. The nominal voltage of a LiFePO4 cell is 3.2V, as opposed to 2V for acid batteries, so a 12.8V battery contains 4 cells connected in series, and a 25.6V battery contains 8 cells connected in series.

A LiFePO4 battery does not need to be fully charged. The lifespan of such a battery is improved with a partial charge rather than a full charge, which is the big advantage over acid batteries.

Other advantages are the wide temperature ranges over which it can operate, excellent cycle count performance, low internal resistance and high efficiency, this being 92%.

You can monitor cell voltages, temperature, and error status via Bluetooth, which is very useful for pinpointing a potential problem such as cell imbalance.