Ron

Battery 1 a deep cycle battery shows 12.80 volts on fluke.

Battery 2 is a dual purpose battery shows 12.78 volts and is installed in vehicle.

Could I maintain the 12.78 volts in battery 1 if it is connected to battery 2.

wwest

Connecting battery's in parallel can be problematic and in some sense fraught with peril.

Yes, the battery's will equalize but not in positive way, the weaker battery will draw down the one with the higher SOC. But, if one should develop a shorted cell the good battery will dump massive current flow into the other possibly BOILING the electrolyte in both,....nearby spark.....

Ron

Connecting battery's in parallel can be problematic and in some sense fraught with peril.

Yes, the battery's will equalize but not in positive way, the weaker battery will draw down the one with the higher SOC. But, if one should develop a shorted cell the good battery will dump massive current flow into the other possibly BOILING the electrolyte in both,....nearby spark.....

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Thanks for the information. I'll just avoid the peril.