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Superior LG battery cell all rechargeable batteries have a limited lifespan and the available capacity is to diminish in the cold weather. Benefiting from advanced battery technology of superior LG battery cells, Ally Series power banks reduce the self-aging helping to maximize the lifespan of power bank, and retain more available capacity in cold season. With enormous 20100Mah capacity, the powerful capacity working together with high energy efficiency, delivers more power and charges more times for all your devices. A TL-PB20100 carries enough power for most circumstances, even a long trip or a family gathering. High efficient TP-Link smart charging technology and 5V/2.4A high efficient charging speed are designed to charge 65% faster and save up to 40% charging time. Fully charging iPhone 6S Plus takes 150 mines with TP-Link smart charging, while 250 mines with an original Apple charger.(Exact charging time may vary subject to actual situation) comprehensive safety features incorporate the latest safety features to protect your devices and power bank against short circuit, over voltage, over current, over charging, over discharging and over heating.