Product specification: Battery Model: 72V 15Ah Nominal Voltage:    72V Nominal Capacity: 15Ah Cell Specification : 21700 3.7V Cell OverCharge Protection Voltage: 4.2V Cell Overdischarge Protection Voltage: 3.0V Battery Weight: about 4.6kg Battery size: 435*77*77mm Cell Source Resistance: about 40mΩ Cell Combination: 20 Series 3 Paralles Cell Quantity (parallel*series): 60 pcs Discharge Cutoff Voltage: 60V+/-1V Charge Cutoff Voltage: 84V+/-1V Rated Discharge Current: 40A Maximum peak discharge current: 120A  Maximum Continuous Discharge Current: 40A Charger mode: CC/CV Standard Charge Current: 2A Charge Time under Standard Charge Current: 7.5hours Max Fast Charge Current: 5A Charge Time under Fast Charge Current: 3hours BMS: 40A Protection board 35A BMS Suitable Motor: 72V 3000W(MAX) Discharge Temperature: -20-65°C Charge Temperature: 0-45°C Battery Power: 1000W-3000W Connector: XT90 for discharge and DC5.5*2.1 for charge Shipping list: 1. 72V 15Ah Lithium Battery pack 1 pcs 2. Build-in 40A BMS Battery advantages: 1. Longer battery life, the life expectancy is two times that of lead-acid batteries. 2. Rechargeable and no memory effect. 3. The weight is more lighter. 4. Smaller dimensions and can be customized. 5. Safer and more environmentally friendly, No heavy metals and hazardous substances. 6. BMS built-in IC chip will prevent battery pack over charge, over discharge, over-current, over-heat, short circuit .