As I use batteries to power the various project around the house and garden I've accumulated a number of different batteries, mainly Lithium Ion ones at 3.7V.
I use some 18650 cells from an old laptop battery that comprise two cells wired in parallel and some mobile phone type batteries that are thin and light.
Two 18650 cells in parallel housed in a 3D printed case |
Galaxy S4 QI Charge pad |
I wondered if I could connect the output to a lithium Ion battery charger PCB, from China and stick the pad onto a battery, this would allow me to just place the battery on a QI pad to charge it up and even place the device using the battery on the pad to keep it powered/charging.
It was quite simple to remove the USB socket from the PCB and solder to the charge pad and connect to the battery.
The battery, charge pad connected to the charger PCB |
The QI pad folded around the battery |
After that I used some heat shrink tubing used for battery packs to hold it all together.
Whole assembly going into the shrink tubing |
The final package can then be used to power the project.
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