This is a very quality battery widely use in fan and UPS. Do check your old battery type and be sure it matches this one before ordering. This battery is 12volts 4.5Ah pin connector and not pull type connector. Ensure you also charge batteries for a minimum of 4hrs before use.When you have used and worn out batteries in your rechargeable fans or UPS, you can't afford to discard the fan due to this condition. Just replacement them with this size of batteries so long as they are the exact match with your fan. No need to throw your Rechargeable Fans away when they no longer stay for longer hours without electricity. It is simply due to a worn out battery. This replacement battery will rejuvenate your Rechargeable Fans again. . Now you have gotten one to use. This backup battery is designed to fit most Brand of Rechargeable fans such as Qasa, Duravolt, Polystar, Lontor, Century, Binatone etc. It can also be used for Generators, CCTV Power boxes and any type of product that requires a 12V battery.  Do note that you must be sure your Fan uses this type of battery first before purchasing. and also check terminals are pin type and not the pull type.