Under normal usage and proper maintenance, the battery of the HAOQI Black Leopard Pro electric bike typically lasts 3 to 5 years. To ensure optimal battery performance, avoid frequent deep discharges and overcharging, and store the battery in suitable temperature and humidity conditions. Additionally, HAOQI offers a free replacement service for this battery for 3 years. If the battery shows significant performance degradation or other issues within this period, you can contact customer service for a replacement.