Hot Batteries

[sailorman]

Why ?

This outcome, just as well the OP found them b 4 worst happened

 

[sailorman]

3 yrs is not long for a house or starter battery. Do they have a warranty?

Generally more bother that the batteries worth

 

[PaulRainbow]

The reason is that if you leave a powerful mains charger connected when you leave the boat it can easily overheat a failing battery. Such a battery might distort and bulge, or even split leaking out its remaining acid. A low wattage solar system giving enough charge to maintain good batteries will not have enough power to boil up bad ones, so it is safe. I have 100 watts worth of solar panels, which is enough to maintain four 105AH batteries.

This outcome, just as well the OP found them b 4 worst happened

My solar panels are more than capable of boiling dead batteries. If you're really worried about over heating batteries, fit charging systems with temp sensors.

 

[Heckler]

I would then reconsider my charging regime, connect a solar or wind & leave the mains charger off when unattended :encouragement:

Sorry, disagree. The batteries got hot because they were knackered. My charging regime is the same as it was, the new batteries stay cold.