Yuasa NP4-6 has been cross-referenced to be compatible and replace Sonnenschein DM2 sealed lead acid Battery. This 3 cell battery by Genesis is rated at 6V 4.0Ah 24 Whr. Yuasa NP4-6 battery are designed using proven gas recombination technology which removes the need for regular water addition by controlling the evolution of hydrogen and oxygen during charging. Gas recombination provides the user with freedom to use lead acid batteries in a wide range of applications.