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NASA Battery Monitor Compact White 12VDC Hatches STARTER MOTOR ASSEMBLY [USA-1B227000] &Description The BM 1 compact is designed to monitor performance of 12 volt lead acid battery systems with capacities of up to 600 Amp hours. It is supplied complete with a precision 100 AMP shunt and a prefabricated cable assembly to enable simple DIY installation. The unit continuously monitors voltage, current (charge or discharge), number of amp hours (charge or discharge), the batterys state of charge and the time to charge or discharge. This