POWER SUPPLY CONTROL DEVICE

A power supply control device comprises: a generator (10) driven by an engine; a lead acid battery (30) and a lithium ion battery (40) connected in parallel to the generator; an SOC detector that detects SOC of the lead acid battery; and a charge controller (70) that controls charging of the lead acid battery. The charge controller performs the charge control based on a regenerative predictive value estimated according to vehicle state information (step S130) when the SOC is greater than a threshold SL1. The charge controller performs the charge control irrespective of the regenerative predictive value (step S170) when the SOC is less than SL1. When the charge surplus of the lithium ion battery is larger than a charge deficiency of the lead acid battery (step S150: YES), the charge controller performs the charge control based on the regenerative predictive value, regardless of whether the SOC is less than SL1 (step S130).