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Pairing AGM and Gel batteries

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I would like to know if it is safe to pair AGM and Gel batteries. I recently built a string of 4 AGM batteries in series. A deal has come my way of 4 gel batteries I intend connect in another series string and connect in parallel with the AGMs if it is safe to do so. 

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3 hours ago, pilotfish said:

It is usually not recommended to mix batteries of different chemistries.

The recommendation is that you use batteries that are of the same size, manufacture, age and chemistry. Due to practical considerations sometimes one ends up mixing batteries of different ages (replacing a dud battery for instance) or mixing batteries of different capacity 232Ah and 236Ah from the same manufacturer (the difference is essentially minimal).

I would however never mix batteries from different manufacturers or different chemistries.

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