InfiRay IBP-2 case for 18650

This case uses two M3 screws as contacts. The third contact (middle) in the original IBP2 is used for a 100k thermistor (overheat protection). The device and charger work without it. However, due to the round contacts (instead of the arc-shaped ones in the original), it is difficult to position the battery in the charger. In the Finder FH35R V2, it positions and locks with bayonets without any problem.

You will also need to make contacts from sheet copper, copper wick, or any other suitable material (drawing attached). If the device shuts off before displaying the icons (about 5 seconds after turning on), it means the contacts are not good or the conductors are not wide enough.

You will also need to make a round gasket (D=19 mm) to cover the screws and prevent a short circuit by the positive contact plate. The rubber seal is also not shown on drawings, sure it is possible to find it at AliExpress. Note, that left thread is used on the cap and the case.