Box for Wondom BCPB2 - battery holder 3S 18650 lithium battery charger and balance protection board

thingiverse

This is a box for a Wondom BCPB2 - battery holder 3S 18650 lithium battery charger and balance protection board. These are nice things which are useful for powering 12V devices and have a MPPT solar charging function. The box adds some protection. The board doesn't seem to get hot, so cooling is not an issue, but it you need to draw high currents you could just press out more of the cutouts. This is the 5th iteration! Use transparent filament (for the lid) so you can see the board's LEDs through it. PETG works well - can be coloured. Different colours for each piece looks nice. The lid has cutouts for all power in and out ports - just score with a knife and prize out the ones you want. The lid has embossed lettering which can be drawn over with a black felt pen to show up more from outside. The button (which presses down onto the board's power level indicator switch) can be pressed into the hole for it in the lid (domed side is up) - support the lid while you do this to prevent cracks. The button then becomes captive so you won't lose it. The button is recessed so that it is not accidentally pressed - for instance if you lay the box upside down. Needs 4 screws (eg M3) to hold the lid onto the base, though there are lips that support it tight anyway.