The market for battery systems is developing rapidly. There is a growing demand for efficient batteries with a large energy density. Victron Energy has a suitable response for this demand: the Victron Lithium-ion battery system. This is comprised of a very modern battery with an advanced control- and security system; the so-called Battery Management System (BMS). The BMS controls the charging and discharging, immediately takes action when certain (critical) values are exceeded and safeguards an efficient energy-transfer.