The Rock-12-120 lithium battery is safe and reliable whilst being small and lightweight, with a long life and fast charging. Comparing the Rock-12-120 lithium battery with similar batteries, the volume and weight are around a third and a half respectively than that of ordinary lead-acid batteries. The build in battery management system(BMS) provides multiple protection: over-charge, over-discharge, over-current and over temperature. The Rock-12-120 lithium battery will last at least 2000 full cycles before minimal performance changes. This means it can last up to seven years, depending on the frequency of use. It can also be charged and discharged under high current without affecting its expected lifespan. The Rock-12-120 lithium battery can be used with solar inverter, vehicles, electricity grid and many other charging methods. It is very suitable for use in various vehicles, such as electric boats, caravans, RVs and so on.