Confirm Battery Specifications: 3.7V 2600mAh Rechargeable Battery with XH 2.54 Connector Lithium ion Replacement Batteries. Capacity: 2600mAh, Power: 9.62Wh; Size: 66 * 21 * 21 mm/ 2.6 * 0.82 * 0.82 inchs; Connecter Plug: XH2.54. Before purchasing, please note that the connector model is the XH connector you need. Applicable equipment: DIY electronic products, Bluetooth devices, toys, lights, solar lamps, etc. Please confirm the size information of the battery before purchasing. Reliable Performance: This 3.7v battery has multiple protection functions, including overcharge, over discharge, short circuit protection, etc. It can play a stable and safe role and protect your device well. Note: Before purchasing, please check the battery voltage and size information to ensure that the positive and negative polarity are consistent with the original battery, that is, the red and black wires of the connector. Only when the positive and negative poles are consistent will it work properly. Warm After-sales Service: If you have any problems, please feel free to contact us. We will solve the problem for you ASAP. 3.7V 2600mAh Rechargeable Battery with XH 2.54 Connector Battery size: 66 * 21 * 21 mm/ 2.6 * 0.82 * 0.82 inchs. Before purchasing, please note that the connector model is the XH connector you need.