I'm about everyone have such experiences: on the road, on the bus, on the train. . . When you urgently need to use a mobile phone, it is very worried about it for its only one percentage of electricity, and we feel that the mobile phone charger is the most useful technology in the world.
In this way, a person has two or three spare chargers, nor is it too much. Although it is easy to buy battery packs from the Internet, it will be more interesting if you do it.
The core components of the DIY battery pack are a USB mobile phone charger, powered by a 9V battery, plus a beautiful aluminum housing. The aluminum housing can be made from a jar of thinhe sugar.
However, it should be noted that most 9V batteries have a charging power of approximately 550 mAh, and now it is enough to flow now. Such battery packs are easier to make messy wiring compared to usually safer and more reliable rechargeable battery packs. If you have some extra 9V batteries, you can consider a homemade DIY charger, use it in an emergency.
Prepare materials
A USB car charger, which is the core of the DIY battery pack. Any model can be used, I will spend a few dollars from a gas station;
A 9 volt battery clip looks like a black mat, two buckles connect the battery and the extended wire. It is mainly used to secure the 9V battery powered by the charger;
One or two 9V batteries;
A soldering iron is used to weld the wire to the charger;
Tin cans of a mening of sugar;
Some necessities (pliers, hammers, nails) are used to punch on one side of the tin can, and some electrician tape is fixed.
Start to make
All materials are ready to make it easy.
First, use the pliers to open the plastic case of the motorized charger, take out the internal hardware.
Find the USB port of the connection board.
Next, heating the soldering iron, firmly welding the lead to the charger. The red line (positive) is connected to the spring, and the black line (negative) is connected to any side piece. Don't get wrong! ! !
In theory, DIY charger has been completed at this time. However, let these power wirings are exposed to the outside of the outside, so it is best to install a housing.
Carefully beat some holes on one side of the mint can with a hammer and nails and wide with a spleen pliers until it is enough to pass through a USB port. Finally, use the electrical tape to stick all things, install the battery and pick up the wire, and the phone charger is done.
Original link: https://www.eeboard.com/news/diy-3/
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