- Anker 3,350mAh Portable Battery Charger $11
Normally about $18 to $25.
Weighing 3oz (0.19 pounds), this charger can be carried in a bag, pocket, or purse and can full charge a dead phone to 100% without a power outlet.
Just keep this Anker charged, and use it when needed.
Other portable battery chargers offer more capacity, but weigh more.