One of the issues with a dual battery system is to keep both batteries equally charged. This applies whether you have a 12 volt series system to make 24 volts or more, or if you have a 12 volt parallel system for extra starting power or maybe a secondary power system for recreational use. This article describes how to charge two batteries so that both of them are charged the same.
When you’re stuck in the middle of nowhere, all kinds of things can go wrong, in far from ideal conditions, with no-one to help you out. On one of our expeditions we sustained a hole to our truck battery. This article describes the field fix that took us back to civilization.
If you own a 24 volt Land Cruiser, then there’s a good chance you’ve had battery problems, especially if you run 12 volt accessories from one of your batteries. This article talks about the solution to your charging problems - installing a charge equalizer and what it can do for you.