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.TL-PB15600 is an enormous capacity 15600mAh power bank from Ally series. The ultra high capacity working together with high energy efficiency, delivers more power and charges more times for all your devices. A TL-PB15600 carries enough power for most circumstance, even a long trip or a family gathering.Powered by TP-LINK Smart Charging technology, both output ports of TL-PB15600 can intelligently adjust the charging power subject to the connected devices. These flexible output ports are designed to be capable of delivering ultra fast charging power for devices with large battery like tablets, and also capable of delivering safe and minimal charging power for gadgets with tiny battery like smart wearable devices.The less charging time, the more you can make out of your devices. Thanks to TP-LINK Smart Charging technology and 5V/2.4A ultra fast charging speed, TL-PB15600 can charge 65% faster and save up to 40% charging time. Fully charging iPhone 6s Plus takes 150mins with TP-LINK Smart Charging, while 250mins with an original Apple charger.Also supporting 5V/2.4A recharging speed, TL-PB15600 takes only 5.8 hours to recover from empty to full capacity. Within same time period, other 15000mAh level power bank with 5V/1A input, only recharges to 43% capacity while full recharge takes 13.3 hours.Compatible with smart devices running iOS, Android, Windows and most other USB-charged devices, from devices with large battery like tablets, to gadgets with tiny battery like smart wearable devices.