A simple, slow, but working charger for the Canon NB-11L camera battery
This project was made for the NB-11L battery from a camera a friend gave me. It came without a charger, so I made my own! It's really simple: you take a Seeed XIAO nRF and use the built-in LiPo charger, since the battery chemistry is compatible. The NB-11L is a single cell 3.7V battery, which is exactly what the XIAO can charge. I also reused the XIAO PCB from my old project Scroll Dial, which didn't quite work out, but the PCB worked just well enough for this project with the battery pins exposed. The charger is pretty slow, but it does charge.
| Part | Qty | Specification | Price | Link |
|---|---|---|---|---|
| Case | 1 | 3D printed (top + bottom) | Self-printed | 3D files |
| Rubber band | 1 | Holds the battery in place | $0.90 | aliexpress.com |
| Screws | 2 | M2x5 flat head | $1.00 | aliexpress.com |
| MCU | 1 | Seeed XIAO nRF52840 | $13.09 | mauser.pt |
| PCB | 1 | XIAO PCB from Scroll Dial | ~$3 | jlcpcb.com |
| Female jumper cables | 2 | To connect the battery to the XIAO | $0.80 | aliexpress.com |
| Male pin headers | 4 pins | Battery contacts + PCB contacts | $0.88 | aliexpress.com |
| Total | ~$19.67 |
See BOM.csv for the full bill of materials.
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| Angled view | Lower angle | Battery inserted |
