Upcycling: A power bank made from an old ammo box

 

Three standard rechargeable batteries (12 volts/ 5Ah), as used in alarm systems, 

uninterruptible power supplies, ecc. fit perfectly in an old ammo box. 

A cigarette lighter plug and a charging socket complement the power bank.

The powerbank stores approx 12 V x 15 Ah = 180 Wh