I was excited to find that these were available for purchase because the largest ones I have seen were 10,ooomAh. I wasn’t prepared for the XL size(6-3/4” x 3-1/2” x1”) but it makes sense that volumetrically it would be 4 times the volume of a std 5,000mAh battery pack!! 🙂 The price was great and it came quickly even with the holiday shipping backups! This is going into my backpack for an upcoming trip and then will go into my hurricane preparedness supplies with my other power banks and chargers. This one arrived half charged and took about 12-14 hrs to complete the initial charge cycle. This one comes with the necessary usb cable but you will need to have a high output charger available to charge with (2.1A output, min.). Make sure to get the usb cable plugged into the charger and power bank all the way so that you see the LED charge status lights blinking. That way you know it’s charging. The fourth light will stay on with the other three when it has completed the charging cycle. If I lived further north where they have to deal with winter storms, tornadoes and other unplanned or weather related power outages, I would definitely have invested in several more. The cell towers and internet servers usually get priority during restoration ahead of individual homes, so once that occurs you’ll be ready to reach out for help with either your phone or laptop!

I was pleased to get this item so very quickly. It was just as advertised. It will be a stocking stuffer. I'm sure the recipient will love it.