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Battery poles can be raised (button top) or not (flat top). Our Button Top Battery has a positive electrode, which is sticking out of battery's body, exactly as a standard alkaline AAAA has. This is the only button top AAAA size, rechargeable battery on the market. Thus, our battery is the best choice for substitution of non-rechargeable alkaline AAAA battery. Flat-Top type batteries are intended for pack assembly only, and they do not work in consumer applications where button top type batteries are required. With a new technology our batteries have lowest self-discharge rate of Ni-MN rechargeable batteries Using the battery for Stylus Pen application requires additional modification of the battery in order to fit the Stylus pen's battery compartment (by removal battery's plastic cover) or (if available) sending you a little bit narrower (difference is 1mm) AAAA batteries. Let me know about the battery's application with your order. The NI-MH batteries could be charged only using specific chargers, which are designed for NI-MH batteries. If you need one, you can buy it at Amazon. The part number is B0722FBDWD. Our Universal Charger accepts all sizes of cylindrical type batteries, including AAAA size