Battery Specifications3.2v AA 600mAh rechargeable batteries, 1.97 inches long and 0.55 inches wide. Please double check that your device is compatible with this battery model before purchasing (charger not included) High Cycle LifeAA 600mah 3.2v 1.92wh solar battery with excellent cycle life, can be recharged and discharged up to 1500 times, long-lasting usage, saving more on battery replacement costs Low Self-dischargeAdopting advanced low self-discharge technology, even during long periods of non-use, it can maintain a low self-discharge rate, extending the battery's lifespan, ensuring long-lasting and stable illumination for solar lights Safe and Reliable3.2 lifepo4 battery have undergone strict quality control, with stable performance and high safety. For transport safety, the batteries are only pre-charged to 30%, so please fully charge the batteries before use to extend their lifespan Wide ApplicationSuitable for outdoor lighting equipment such as solar lamp