10400mAh Mi Power Bank (NDY-02-AD) 10400mAh Mi Power Bank Aluminum casing with battery cell technologies from LG and Samsung. 10400mAh large capacity. Premium Li-ion battery cells from LG and Samsung add an extra 10400mAh to the battery life of your smartphone, tablet or digital camera. The Power Bank is capable of 2.5 recharges for the Mi 3. 2.5full Charges on the Mi 3 4.5full Charges on the iPhone 5s 1.5full Charges on the iPad mini * Lab test results. Actual usage may vary World-class circuit chip protection.Nine layers of protection, built by Texas Instruments Adopted USB smart-control chips and charging/discharging chips from Texas Instruments.Mi Power Bank not only provides nine layers of circuit chip protection, but also enhances efficiency. Temperature Resistance Heat-sensitive and temperature control mechanism ensures Li-ion batteries operate within a safe range. Protection from Short Circuit Automatic protection to the motherboard and battery when short circuit occurs. Reset Mechanism Power button can be used to reset the power bank in unstable environment. Input Overvoltage Protection OVP circuit prevents voltage surges from damaging the device. Protection from Incorrect Insertion Detect when the charger is inserted incorrectly and automatically stop charging. Protection from Output Overcurrent Monitors output current and shuts off when current exceeds the maximum limit to protect the device. Output Overvoltage Protection Monitors output voltage and shuts off when voltage exceeds the maximum limit to protect the device. Protection from Overcharge and Over-discharge Japanese technology is adopted to prevent overcharging and over-discharging from damaging the Li-ion batteries. PTC Protective Circuits for the Cell Imported battery cells are equipped with PTC to effectively control current and provide protection when temperature and current exceed the maximum limit. Optimized charging/discharging efficiencyup to 93% conversion rate World-class chips are not only safer, but improve charging conversion rate and stabilize discharging voltage with advanced resistance-capacitance sensors to optimize efficiency and durability. Added100rounds Increased 10%power output efficiency Up to 93%conversion rate Simple design. Buttons, indicator lights, and connection ports are located on one end of the power Bank.