Home-made Powerbank with a 4000 mAh battery in a silicone case, do it yourself from improvised materials.
From used:
ALB Sony Ericsson 930 mA, TEXET 800 mA, Nokia 900 mA, Texet 1450 mA.
solar battery from a tourist flashlight, silicone case from a smartphone,
power controller, voltage regulator and switch. In fact, all components except batteries, with aliexpress. Links to them are in the description of the video.
By assembly:
We connect the power controller to the battery from the battery, the load will be the output voltage stabilizer connected via a switch. The solar battery is connected in parallel with the microwire input of the power controller. The good these controllers are, they are very versatile, separately the contacts are for the load, and for the battery, and for supplying voltage to it in addition to the input microusb. With a lack of controller power, you can use the parallel connection of the controller cards. I have already collected several power banks based on them and have never once failed a single controller and have never failed.
The case was a silicone case from LENOVO A6010. It is elastic, soft and is supposed to protect the solar battery in the event of falls from damage. This summer bank was used by a daughter in the village, and Malomalsky coped with his duties. It will not replace a full-fledged charger, in terms of charging from light, a rather weak battery, it does not fully charge for the whole day. But it still helps in a difficult moment when there is no access to the outlet, and the device needs to live another half an hour at least to get to normal charging.
In principle, I think any person who is even a little familiar with electronics is able to assemble such a do-it-yourself bank. True, the first tests on the solar battery are not encouraging, it charges very slowly.True, and the weather is failing now, there is almost no sun.