fischertechnik battery stick update

thingiverse

The outdated fischertechnik battery stick can be turned into a state of the art accu and power bank. The original idea came from Jan Hanson (juh) who posted a version on the ftcommunity forum in 2018. However his version did not use 3D printing. There are different battery stick versions; the lids presented here are for the stick where the upper lid below the switch can be removed. There are two types of nobs with which the lid can be shifted in the bottom half (type a and b, use a for the stick where there are no obstructions in the lower part, b for the type with obstructions) These versions uses customised lids for two of the various versions of the battery stick and are designed for either 5V or 9V The 9V version consists of two 18650 cells, a 2S BMS, a MT3608 dc/dc boost converter, a 2S capacity meter and a mini voltmeter, plus a 2-channel on-off switch and a 9-12V dc female connector. The 5V version has one 18650 cell, a 1S BMS, a LM2596 dc/dc boost converter, a 1S capacity meter and a mini voltmeter, plas a 2-channel on-off switch and a USB-C female connector. A female USB-A connector is added as well so that the unit can be used as a USB powerbank too. Conversion of the old battery sticks starts with removal of the square plate at the back of the switch, removing the internals and adding a new switch, following by soldering all the new components together and inserting it in the housing. Files as follows: type 1: 9V version, a and b for different lid versions type 2: 5V version, a and b for different lid versions type 3: square back lid