Join Date: Mar 2002
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Re: Red & Yellow Optima\'s in a Dual Battery Sys
Not a good idea.
You do not want to mix different batteries like that.
That deep-cycle runs at a higher voltage than the starting battery. The starting battery will draw down the deep-cycle and kill it in a dual battery config.
If you kept them isolated from eachother, you would have a chance. If you set it up for running on only 1 battery and then switching totally over to the other for charging and winching, it might be fine. You would have to be pretty careful to make sure you were not running both at the same time.
Red tops are great for starting and normal duty. There is a reason they use starting batteries in cars instead of deep cycle batteries. They are great for high-amp fast charging and have a nice long life in a car. They are terrible for deep cycling, though, and will die in like ~12 deep cycles.
Yellow tops are a real deep cycle battery. Just like any other deep cycle, they are great for long term use with winches and super high amp draw duty stuff. They can't handle the higher amp charging with the high-output alternators, though. Super high-juice alternators will kill a deep cycle in a hurry.
Most people will try to run a deep cycle battery with a high-output alternator for winching. This is a real good way to kill your batteries. A standard normal output alternator is what you want for a deep cycle.
Good luck with the setup.