I don't understand about the charging system. In the Synergy system the hybrid battery is charged from the inverter... the inverter has its own cooling system that uses normal Toyota coolant. The 12 volt battery is charged by a DC-DC converter that is almost indestructible. There is a lot of margin in the design so that you don't need to do anything but be aware of any warning lights come on. It is a long lonely vigil waiting for problems with that system.
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