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Only issue with dissimilar batteries is supposedly when they are connected and not being charged. As long as you primarily use the batteries disconnected when the engine is off, then should be no issues.


I'm curious as to the reason for disconnecting the batteries when they are not being charged (other than eliminating the chance of killing the main battery due to loads on the auxillary battery or vice-versa).

I run a similar setup as yours and during cold weather I often leave the two batteries manually connected together to aid in cold starting. So far I have not seen any problems.

Bob Garrett
83 Toy Pickup
95 FZJ80
Shawnee, KS