Dual Batteries, Why?

Joined
Oct 27, 2003
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North Cadillac
You'll have to excuse my rookie questions, but what is the purpose of having dual batteries? Is one just back-up in case the other one goes out. Can you use them both at the same time? I guess for those who have home theatres, winches, cb's, fridges, and electric guitars hooked to the 80 it might not seem overkill. :-[
 

woody

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For my application, battery 1 is an Optima Red Top starting, used exclusively for the starter, engine, etc operation. It's fully isolated from battery 2, an Optima Blue Top deep cycle, which is used 100% for winching operations.

If my winch is used enuf to kill the battery, I can still start the truck. Or, potentially, use battery 2 to jumpstart battery 1 if it were to run low on juice.
 
Joined
Nov 3, 2003
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Placentia, Ca
With an automatic, a dead battery means you are walking home. (one of my biggest issues with automatics) Dual batteries mitigate that somewhat.
 

sleeoffroad

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Mar 27, 2003
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Got to keep the :beer: cold in the ARB fridge. Most trucks we do, the 2nd battery powers a 2nd fuse box for all accessories. That way, when you turn of the truck, you can run all the accessories and not worry about killing the main battery.
 

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