Best PNY Power Bank 10400mah in Amazon India. Check out this 3.7 volts Li-po battery powerbank that comes with 10400mAh capacity. It has a unique feature that is auto power off that make better use of your battery energy. It has single USB output along with LED torch light. There is also 4 LED power indicator that shows battery level. You get a one-year limited warranty for this powerbank from the date of your order.