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Battries are discharged and now charger does not operate
The batteries will discharge below the reference voltage required for the charger to "see" the batteries if left uncharged for more than a month or more. You have to carefully bring the batteries back up to about 12 volts each for the charger to see them. The easiest way is take them to a qualified battery shop that has a step charger for sealed batteries. If you attempt to use a car charger on sealed batteries, you will ruin the batteries or even blow them up as the cases are sealed and the gas from charging has no way to escape. Some people have used a standard car battery charger on low only, applying a charge to one battery for about 15 minutes, then the other for 15, etc. until the batteries are back up to 12 volts, but again, using a car charger is dangerous and could cause the battery to explode.
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