Charging state for the Bosch refurbished 14.4 V battery
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The item shows the charging state for the Bosch 14.4V battery, which was refurbished from a Ni-Cd to a Li-Ion battery.
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Battery charging state unit checks the charging state of the Bosch Battery case used for a Ni-Cd battery pack, now refurbished with a 4 Li-Ion battery pack.
What do we need for assembly?
3D printed part led-cover
3D printed part led-battery-socket
some nickel welding strip 6mm x 0.1-0.2 mm
electronic LED charging indicator XW228DKFR4
black and red wire for connecting the LED charging indicator to the nickel welding strip
How to assemble?
3D print both parts (suggested material PETG 0.4 nozzle, 0.2 layer, standard number of vertical, horizontal layers)
2 strips of 50 mm long and 6 mm wide nickel welding strip, implemented in the battery holder 3D printed parts, and formed as shown in the picture
After forming, you may weld ends with solder or with current, then add some solder on top inside the area to prepare wire joints
Solder plus and minus wire to LED charging indicator XW228DKFR4 (additionaly if you don't have a proper 4S-rated display, you may make changes to it follow next URL-s :
https://ca.rstenpresser.de/blag/2025/07/changing-the-threshold-of-a-led-battery-indicator/Press LED charging indicator XW228DKFR4 in to LED cover 3D part; it is a very tight fit
Solder plus and minus wires to the proper contacts on led-battery-socket parts (prepared nickel contacts, check picture for polarity, or use a battery like reference)
Test connection
Use Super Glue, or some other glue you prefer, and glue both parts together
Modification
You may modify parts using FreeCAD. Files are provided for both parts.