I used these to replace dead batteries in my Waterpik SR3000 toothbrushes. Batteries fit the space perfectly. Only minor modifications were required, such as B. cutting off the connector plug, stripping the wires and soldering them to the wires of the toothbrush. Batteries charged normally. And so far a week without charging. As it should be. The choice was to buy a pair of new toothbrushes for $40-$50 each, or buy batteries for $3 and get them to work. I'm glad I chose these batteries!
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