On Monday, May 18, 2020 at 5:16:48 PM UTC-5, John Foster wrote:
I'm looking for a good charger for my PowerSonic AGM batteries. I have a car charger, but that seems to be malfunctioning, as it doesn't seem to want to charge car batteries or my glider batteries. Any recommendations on a good charger for these type of batteries?

I've used the Battery Minder models from VDC electronics for many years. This company uses a de-sulfating regimen that significantly prolongs battery life.

Different types of lead-acid batteries do require different charging modes for best longevity.