In devices such as Bluetooth headsets, mp3 players, and similar miniature gadgets, very small capacious rechargeable batteries are installed. Maximum 3-4 hours of listening to music, no more. How many I have repaired and disassembled, batteries are everywhere from 40 mA / h, and no more than 350 mA / h. This is very small. And if your smartphone has a powerful battery, then taking a large and heavy Power Bank with you on the road, for the sake of recharging the player or headphones, is not very cost-effective. Therefore, I propose to make a compact external charger from used disposable evaporators. The product that we will receive as a result will have a capacity sufficient for 3-4 charges of the headset, and 2 charges for an mp3 player.
The device will be no larger than a disposable lighter, which is very convenient for carrying with you.
It will take
- Disposable vaporizer (2pcs).
- Charging module for 18650 battery.
- Soldering iron, tin and flux.
- Engraver with cutting disc.
- Secondary glue.
- Hot glue.
- Insulating tape.
Making a charger
First you need to pick up two evaporators with the same batteries. It is desirable with the same capacity and shape. I had no problems with this – knowing about my hobby for, of all kinds, assemblies and homemade products, these disposable vaporizers are constantly brought to me.
The manufacturers of these devices are very short-sighted in using lithium-ion batteries in disposable gadgets. In addition, most of these devices are sent to landfill after use, thereby poisoning the soil. So isn’t it better to give them a second “life”? So, if you yourself are not fond of such a dubious pleasure as smoking these things, then perhaps among your friends there is someone to ask such unnecessary devices. We disassemble two identical evaporators and cut off the wires from the battery with wire cutters.
All other insides can be thrown away. We also leave the body of the color you like. We take the charging module and try it on to the body.
On the side where the battery was removed. If the module does not fit into the case, then we mark with a marker the place that needs to be cut down, and we cut down this place.
Again we try on the module in a new place.
If everything fits, you can start assembling the battery. To do this, glue both batteries with a second glue. Plus to plus, and minus to minus.
Also, in parallel, we solder them:
Trying on how they enter the body. If everything is in order, then you can solder the charging module to the resulting dual battery.
Each of the batteries has a capacity of 280 mAh. For soldered batteries in parallel, the capacity doubles – 560 mA / h. So, we clean the ends of the wires, tinker them, and solder them according to the polarity indicated on the module and batteries. Here you need to be extremely careful; if you make a mistake with the polarity, the module will instantly fail. We check the resulting filling of the future charger.
The indication on the module glows blue when energy is released, when the charger itself is charging, it will glow red. Now we isolate the contacts of the batteries with a piece of electrical tape, and push the whole thing into the case.
In those places where the fiberglass base of the module touches the charger body, drip a drop of second glue. Seal the remaining cracks with a hot melt glue gun.
As usually happens, I ran out of hot melt at the right moment. I had to improvise with the leftovers … We wait until everything hardens and dries up, and we check again. It is possible on several gadgets.
Everything works like a watch. And it charges itself from the power supply, and gives charge to other devices. We charge the new device, according to the LED indication on the module and, together with a short USB cable, you can put it in some pocket of everyday outerwear. At the right time, you will definitely remember it!
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