Delivered with a transparent protective box Characteristics : Capacity: 4000mAh Type positive stud: flat top Nominal voltage: 3.7 volts Max charging voltage : 4.2 volts Max charging current : 2A Max discharge intensity : 30A Warnings: Please respect the maximum charge and discharge voltages. Do not short-circuit the battery. Always store its batteries in a box provided for this purpose, especially during transport. If you do not use your battery for a while, make sure it has a voltage greater than 2.5 volts.