Secondly, if you connect two in parallel, you lose out on the two main benefits of dual battery systems: This means that if you connect two batteries in parallel, you'll never get full potential out of your system. Batteries are at the same condition level.A short distance difference of just one metre usually results in a few tenths of a volt difference with the current that we normally see in 12V systems. The voltage that arrives at each battery is the same.If not, then you may not charge one to its fullest level. The batteries have the same capacity and chemistry.This works, but only with a precarious set of assumptions: It's tempting to think "Ah, I'll just connect the batteries in parallel!" Won't work with latest cars with smart alternators.Gets 80% out of your accessory battery doesn't charge it too fast.Engine bay only, lead acid batteries only.Dual Battery Systems - Direct Connections Let's go through the pros and cons of these in turn. These are expensive but have multiple benefits. This works better, and isn't very expensive. Voltage Sensitive Relay/Isolator(a.k.a.There are three main ways you can connect two (or more) batteries in a dual- or multi-battery system You build a dual-battery system into a car or truck for mainly one reason: to keep your accessories (fridge, chargers, epic sound system) on one battery, and your vehicle system (starting and operating critical electrics) on the other. In building our 4x4 adventure vehicle system, I learned a lot about the way people build dual battery systems in cars and trucks.
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