Features: Fine quality plastics material case, with impact resistance and shockproof design, wear resistance and with fine durability. Built-in integrated microchip with stable working performance, prevents overcharging and self-discharge, provides multiple protections and stable voltage circuit. Temperature protecting, overtime protecting, overcharge protecting, overcurrent protecting, overpressure protecting, and with protective panels to protects the battery. There are two different capacities of 5pcs lithium battery cores or 10pcs lithium battery cores for you to choose, you can choose according to your demands. Built-in LED power indicator helps you get work done more easily, it's timely to recharge, help you monitor the battery charging status and check if the battery is in nice condition.