PowerBox BaseLog 3410 Now Replaced by the PowerBox Source Battery Backer 3420PowerBox BaseLog 3410 with MPX MPX & MPX JR Leads The PowerBox BaseLog combines high performance capacity with excellent battery monitoring facilities, as it includes the option of sending battery relevant data directly to the transmitter's screen. Like all PowerBox battery backers, the PowerBox BaseLog features completely redundant construction. The regulators, the switches and even the micro controllers which are responsible for the on off switching