Or the reg/rec can't dump as much current to the lithium as a lead acid so it ends up soaking up extra current in heat.
Well that link I posted seemed to say something about cutting off when too hot, so possible that lithium is just too sensitive for retrofitting on otherwise crude electrical circuitry?
In that case maybe move the reg/rec in to air flow and or maybe install a fan.
@Airhead started
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Or the reg/rec can't dump as much current to the lithium as a lead acid so it ends up soaking up extra current in heat.