Specifications: Cell Type: LiFePO4 Standard Voltage: 12.8V Standard Capacity: 8Ah/20Ah/30Ah/50Ah/100Ah/150Ah/200Ah （Please see details for more） Why choose us? [Long service life]: The product is over 3000 times cycles which is more than normal batteries so stays a long-term life, that typically up to 7-8 years. [BMS smart control]: The battery management system will cut off the current output to protect the battery from overcharges, overdischarges, overloads, abnormal temperatures and short circuits, which can improve the performance of battery. [Quality assurance]: The battery has been tested well under various of conditions. Even in the low temperature (0°C) and high temperature test (>55°C), neither the current nor the voltage were hardly affected.