How to "revive" a dead AGM type battery

Joined
Feb 17, 2007
Messages
320
Location
S Cal
I came across an interesting article about how to revive what appears to be a "dead" AGM type battery, when it fact it is just too discharged for a battery charger to recognize that it is attached.

The trick it to connect a healthy(fully charged) 12v battery in parallel (positive to positive, etc) with the 'bad' battery and then connect your battery charger to one of the batteries. The battery charger should then start charging the pair, and once the 'bad' battery has enough voltage, you can remove the 'good' battery and continue with the charge.

HotRod.com
 
Joined
Apr 25, 2007
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4,954
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62
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New Jersey
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st1300 '04
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7163
I forget but I think the bat tender looks for 8volts to decide if it is hooked up to a battery and initiate a charge.
Chances are good though if a battery is that low, particularly if it sat, it may charge back to nom voltage but have very low cranking amps.
 
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