Proper 12 Volt charging?

Peter, my view is that the potential output of chargers is of no consequence, PROVIDED the voltage offered is appropriate.

The battery will accept what it can, depending on its internal resistance and the voltage offered.

Vis... Many alternators will offer over 100A to a single battery. This presents no risk to the battery because the voltage is not excessive.

I have used a 120Ah Fullriver HGL as the crank battery in the OKA for 5 years. It is the longest lasting crank battery I have had in the vehicle by a factor of 2X. It is NOT under the bonnet.
The alternator is 80A and the voltage is 14.3V.

It is advisable for charge sources to have battery temperature compensation, if the are outputting close to the maximum volts recommended by the battery maker.

I agree that there is no problem with connecting multiple charge sources at the same time.

Cheers,
Peter
OKA196 Motorhome

I used to think the same as Peter_n_Margaret but after trashing an AGM in under 2 years, now agree with PeterD.
FullRiver quote a max charge rate of 24Amps in their specs for the 120Ah batteries. To charge at an unrestricted rate from an alternator will progressively reduce the batteries capacity until it becomes useless.

Using one as a starting battery in a cool environment is a cushy environment for a battery - would rarely exceed the 24 amps as it's stays fully charged and cranking uses next to nothing.

I agree that DC is better for cycling applications.
The HGL is predominantly a standby battery, but it has done me proud in high vibration which was the cause of my previous crank battery failures.

Cheers,
Peter
OKA196 Motorhome