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.
In that case maybe move the reg/rec in to air flow and or maybe install a fan.
Having them in airflow, or on a heatsink is a good shout. I mounted the one on my XR on 1/8th" Aluminium plate, which wicks heat really well. Every little helps.
@lynx 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.