The Dual, Low Profile design of this 9V charger makes it a perfect fit to be stored inside your tens carrying case. Charger has 2 charging lights, which only display that the batteries are being charged--it doesn't show when they are charged. This is a trickle charger, it takes about 12 hours to charge a standard 200mA battery. This and all battery chargers must be used with a rechargeable battery only.
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