Made: USB Rechargeable 9V Lithium-ion battery using MT3608 and TP4056 modules

In this video I show you how I made a USB rechargeable 9V Li-ion battery that can be used to power electronics. Of course I could have just bought such a battery (see review-links below), but where is the fun in that? Instead I ordered the component modules (MT3608, TP4056) and put them together in the housing of an old battery.

The style of this video is a bit experimental. I've tried to show more details on the practical side, such as the soldering, putting the parts together and in-between testing. For that reason it was not scripted. It is less polished and less concise than most of my previous video's. As you will see, the commenting talk is more impromptu with plenty of uhms, misspoken words and longer silences. To keep it view-able I still needed to edit much of the recording out and only show the highlights.
Since I have no clue, I ask you to leave your feedback in the comments and tell me if the format makes much difference to you and which style you prefer. Please view one of my previous videos (e.g. https://youtu.be/SijlC1Rqykw) to compare the styles.

Video index:
0:40 - showing the used components/modules
3:04 - orientation and stacking of the component
5:15 - wiring and connecting the charger module to the battery
6:05 - wiring the connector cap and the boostconverter
8:00 - testing the assembly and setting output voltage
9:12 - adding the switch and testing it
10:30 - putting the assembly in the tin housing and testing it
11:15 - testing the assembled battery using a component tester
12:16 - will it still charge?
12:42 - drilled holes for LEDs and pot-meter
13:38 - 3D printing the backplate and closing the battery
15:20 - demo of my RF24-MQTT D1 ESP8266 gateway, powered by the rechargeable 9V battery

Links and references:
- batteries (650 mAh LiPo) via AliExpress*: http://s.click.aliexpress.com/e/9fc0j77
- modules also ordered via AliExpress*: http://s.click.aliexpress.com/e/juBamia
- downloadable DIY mini 3D printer 3Dtje: https://www.thingiverse.com/thing:1023641
- review and analysis of the OkCell 9v PP3 Lithium Battery by Adam Welch: https://youtu.be/CR3l82x88xg
- review and analysis of the Znter 9V USB Li-ion battery (Russian): https://youtu.be/MS5Nm3y8kR0
- someone having problems with MT3608 modules: https://youtu.be/ojw112KoNBI (I also wrecked one, probably by shorting the output. see https://youtu.be/-3tBw6WSZVM for the repair...)

*=Affiliate link.

DISCLAIMER: this video is a private project that worked for me. If you decide to use this video to create your own battery, you do so on your own risk. In no way I will accept any liability for any problems, damages of injuries you may encounter or cause.

Видео Made: USB Rechargeable 9V Lithium-ion battery using MT3608 and TP4056 modules канала Maxint R&D