Listers
Just used this info to recharge a very discharged AGM battery. AGM style
battery sat for 4 years in my old yellow 100 in a California warehouse. I had
sold the car many years ago to a fellow in CA. I repurchased the car. When it
arrived back in Pennsylvania the battery was completely flat. Using the
conventional 10 amp charger would barely get the battery up to 4 volts. Using
the method described below it is now back up to 12.5 volts.
Barrowed info from the internet?..
?This is a recovery method for the do-it-yourselfer using the equipment you've
got in the garage. With this option, you're going to trick your traditional
charger into charging the deeply discharged AGM battery.
Here's what you need:
? Battery charger (under 15 amps)
? Jumper cables
? A good battery, preferably above 12.2 volts. (It can be an AGM or flooded
battery- it doesn't matter.)
? The seemingly dead, deeply discharged AGM battery
? A voltage meter
? A watch or timer
Now, here's what you do:
Hook up the good battery and deeply discharged AGM battery in parallel ?
positive to positive and negative to negative. Do not have the charger
connected to the battery or turned on at this stage.
Now, hook up the good battery to the charger. Turn on the charger. The charger
will "see" the voltage of the good battery (hooked up in parallel), and start
providing a charge.
After the batteries have been hooked up for about an hour, check to see if the
AGM battery is slightly warm or hot to the touch. Batteries naturally become
warm during charging, but excessive heat may be an indication that there really
is something wrong with the battery. Discontinue charging immediately if the
battery is hot to the touch. Also discontinue the process if you hear the
battery "gassing" ? a hissing sound coming from the safety valves. If it's hot
or gassing, STOP CHARGING IMMEDIATELY!
With your voltage meter, check back often to see if the AGM battery has charged
to 10.5 volts or above. This generally takes less than two hours with a 10-amp
charger. If it has, disconnect the charger from the wall outlet and remove the
good battery from the charger. Now, connect only the deeply discharged AGM
battery to the charger. Turn on the charger and continue until the AGM battery
reaches a full charge, or until the automatic charger completes the charge
process. In most cases, the AGM battery will be recovered.?
Hope this helps someone with an expensive AGM battery that doesn?t want to
charge?.
Perry
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