Charging mobile phones in the forest

Holidays are on the way, people are already packing backpacks, pickling meat and pumping maps into the communicators. Perhaps it is worth spending half an hour of time and make recharging for your communicator in order not to stay in the forest without ZHPS or without a phone?

So, we need a little bit - a holder for 4 batteries or AA batteries, a USB connector from an old motherboard and a tube of sealant:

Solder (did you forget to list the soldering iron in the list?) The red wiring of the holder to the first leg of the connector, and the black one to the fourth leg, and glue the connector to the holder with sealant.

It remains to insert the batteries and buy (or solder) the wiring for charging mobile phones from the computer.

Now you have in your pocket a supply of energy for your device for the next few days.
Have a nice holidays!