The Apple Watch is a wonderful wearable device that helps you stay connected and active. It does not have an unlimited battery life though. The SmaShell A100 Power Case is a portable case with a 3000 mAh battery that recharges your Apple Watch. It can also work for your smartphone. The case protects you Apple Watch from damage.
The SmaShell A100 weighs only 240g. It is compatible with Apple Watch 38mm and 42mm models. Costs under $32 at this time.[where to get it]