Introduction: Convert Your Metal Detector to a 12V Battery Pack With 18650 Li-ion Cells With 3S BMS
Are you tired of buying the same pairs of 9V expensive batteries and throwing them away after few days of coin hunting?
One of the best options to recycle old 18650’s is to build a battery pack. With the correct BMS and number of 18650 cells your battery pack can achieve the desired operating voltage.
In this article I’m sharing the steps and the requirements for converting your metal detector to rechargeable Battery Pack.
Save money from 9V batteries purchases and expand the working time and detecting power of your Metal Detector.
The example below is for my cheap Metal Detector BOOLATEK MD4030P but the Battery Pack can be used for any detector working on 9V-12V.
Supplies
Parts:
1. 3 x 18650 cells. How to recycle 18650 HERE.
2. Nickel Strips.
4. BMS 12V 3S 18650.
5. T Plug connectors – 1 x Female and 2 x Male.
6. Cables.
7. Small plastic board for isolation.
8. 3D printed case – Base and Cover – Download the files HERE. You can use any non-metal box with similar size. (OPTIONAL)
9. Old 12V Charger. If you don’t have any you can buy a new one HERE.
Tools:
1. Soldering Iron with Solder Wire.
3. Spot Welding Machine. (OPTIONAL)
4. Access to 3D Printer or printing on demand at recyclestein.com. (OPTIONAL)
5. Tape.
6. Glue.
7. Multi-meter.
8. Lighter (For Heat Shrink Tubing).
Step 1:
I’m using a standard 3S BMS from Aliexpress for 20A. The proper connections to the BMS and the batteries are in the image above:
Step 2:
To build your own, please follow the steps from the video.
You need to be very careful when you working with lithium cells. They store a lot of energy and you can easily start fire if you are not following standard safety rules and precautions. Lithium Polymer and Li-ion batteries are volatile. Failure to follow the below instructions may result in fire, personal injury and damage to property if charged or used improperly.
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