Victron SuperPack Lithium Battery 25.6V/50Ah (M8) SuperPack batteries are very easy to install, and do not require any additional components. The internal switch will disconnect the battery in case of excessive discharge or high temperature. The batteries can be connected in parallel. Series connection is not allowed. SuperPack batteries are very easy to install, and do not require any additional components. The internal switch will disconnect the battery in case of excessive discharge, overload, or too low or too high temperature. SuperPack batteries will cut off charging or discharging current when maximum capacities are exceeded. For many applications (particularly off-grid solar applications), energy efficiency can be of critical importance. The energy efficiency round trip discharge from 100% to 0% and back to 100% charged of an average lead-acid battery is 80%. The round-trip energy efficiency of a lithium-ion battery is 92%.