This power bank is slim, and provides power to more than one mobile device — Windows or not. Power banks are a great accessory to have on hand for any phone or tablet, especially when they grant the ability to push power to multiple devices. This particular power bank from Vinsic may not be the smallest portable battery on the market, but its sleek design looks sharp, and 2 USB ports are certainly better than one. Measuring a mere half-inch in thickness, you can slip it in a bag or carry-on without crowding it up. It’s definitely too wide to store in your pocket though, which isn’t ideal for a grab and go solution.