The original charger transformer lists its voltage at 21.4v, but I can't find the specs on this charger, so I can only assume it's around 18v, since it says 9.6-18v charger. I charged my batteries for my Grasshog and when the charger indicates a full charge the rpm's of the weed whacker are noticable slower than the original equipment charger, so I can only assume the voltage difference in the two chargers is the problem.
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