Parallel charging different batteries

Submitted: Friday, Jul 15, 2005 at 13:10
ThreadID: 24745 Views:2889 Replies:7 FollowUps:22
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Hi Chaps and Chappettes,

I have 2 x Delkor Calcium batteies as the main and auxilliary batt in my 105 series landcruiser. I leave the 'fridge in the rear of the l/c and it runs off the aux battery. I have a rotronics MH10 charge isolator thingy that charges ther main battery before hooking them both up in parallel.

Just recently, we purchased a campertrailer that has a couple of AGM (absorbed glass matt) batteries. So far, the only things we run off the campertrailer batteries are low power lights. When the campertrailer is hooked up, its batteries are connected in parallel with the aux battery. As we drive merrily along, all the batteries are connected in parallel as they get charged from the alternator.

I read somewhere (may have been here) that charging AGM batteries and wet cell batteries in parallel is a no-no. However, I cannot find out why this is so and what damage is done to what battery (and over what length of time).

Can anyone enlighten me? I'd like to know so that I can "re-engineer" my setup without spending unecessary $$$$'s. Any suggestions on layout would be appreciated.

Kind regards
Stephen J.
VKS737 - Mobile 2735

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