Repair Battery for Digipower DP-VLRGB

My LiFePo battery in the DP-VLRGB went faulty. Instead of disposing of the whole device, I removed the battery and replaced it with 18650 cells. I had to design and print a new cover because the 18650 cells are thicker than the pouch cell.

1 pce, red wire 1.5mm², 200mm

1 pce, black wire 1.5mm², 200mm

1 pce, side cutter

1 pce, ruler

1 pce, metal saw

1 pce, 18650 battery holder (single or double)

1 pce, cover replacement

2 pcs, 18650 cell, 3.7V

soldering equipment

insulating electronics tape

Instant adhesive glue

Screwdriver T6x50

For reference, refer to the cover image or figure 1 in step 5. Connect the two positive poles on the battery holder as short as possible. Solder on a 150 mm red cable for the later connection to the circuit board.

Repeat the step with the negative pole.

Print the two STL files. These are the battery cover and the cover. The cover is glued on at the end.

Printing recommendation: PLA, layer height 0.2mm, speed 100mm/s, density 15%, wall count 2.

Danger to life: Never connect positive terminal B+ and negative terminal B-!

Remove the metal cover with the Torx screwdriver. Carefully park all screws.

The pouch cell is glued. It is best to separate the pouch cell from the adhesive using a thin wire.

Using the side cutter, first disconnect the positive terminal B+, then disconnect the negative terminal B-.

The LiFePo pouch cell has a capacity of 4000mAh and has 3.7V.

Info: Contrary to popular misconceptions, lithium iron phosphate lifepo4 are highly safe and do not catch fire under normal operating conditions. Their stable chemistry, thermal stability, built-in protection circuits, and robust physical design contribute to their enhanced safety features.

The original cover has informative operating instructions. Therefore, shorten the cover by 88.5mm from the left. In this way, the instructions are retained for the user.

Please find attached the step file of the original cover. Own creation, information without guarantee.

No batteries are inserted now!

Take the battery holder from step 1 and solder the red cable to pad B+ on the circuit board.

Repeat the step with the black cable and pad B-.

Pad B+ is covered with insulating tape to prevent an electrical connection with the metal cover.

Reposition the white insulation under the display so that pad B- is covered. 

Position the battery holder with the new cover.

Screw on the new battery cover. You can then fit the shortened metal cover.

Test the device with an 18650 battery. The battery is inserted with plus + on the side with the red cable. The markings on the holder have no significance.

All information and work steps are without guarantee. Any liability is rejected.