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Secondary or Primary?

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So a buddy of mine asked me about getting an agm battery. Naturally I suggested XS Power, and I told him to get the biggest one that will fit under the hood. However he recently bought a new MotoMaster Eliminator series battery thinking it would do the trick. So he doesn't want to get rid of it and I was always under the impression that one should upgrade your primary first.

Is it better to run a normal starting battery as a primary, and have an XS Power battery as a secondary?


Alpine Type S comps

Alpine Type S 10''

Alpine MPR-F300

Alpine MRX-M50

Mechamn 270

XS Power d3400s


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I've been wondering the same thing I have 2 battery's and xs, and a deka , and I've noticed my voltage stays higher with only one in the trunk and the stock under the hood! I'm thinking he'd be battery off with an agm under the hood and in the back instead of the stock battery at all.

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