Using a Split Charge Relay with a Lithium Battery: Is It a Good Idea?

In short, no, not really.

Lithium leisure batteries require a controlled and specific charging profile to operate safely and maintain long-term performance. A split charge relay doesn’t regulate or manage the charging process, it simply connects the starter and leisure batteries and allows power to flow freely.

This lack of control can result in inefficient charging, reduced battery performance, and in some cases, unnecessary strain on your vehicle’s alternator, particularly in campervans and motorhomes with modern electrical systems.

If you’ve invested in a lithium setup, it makes sense to pair it with a DC-DC charger designed specifically for lithium batteries, ensuring safe, efficient, and fully optimized charging.