I believe the green MTH batteries are pre-charged from the manufacture. I'm sure they loose some of that charge from shelf life, but I never purchased one that had less then 8 volts in it. I must agree with G on charging with track power overnight. I sleep better knowing everything is powered down in the basement before I go to bed. Also, using a small wall charger to top off a new battery before installing it, will use less household current and not add any wear to our layout equipment. Or if the engine has the plug on the bottom to just use the MTH charger. John, I also wonder if the charge circuit shuts down when a battery in the train is fully charged and if the plug on the bottom of the engine goes through that charging circuit or directly to the battery. If it's direct, does the MTH charger contain a circuit to stop charging when full?
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