USB BL-1 battery charger

thingiverse

This is a charging stand for a BF-888S radio and/or BL-1 battery that uses a USB charging cord for power. It is configured for use with a 26x17 mm TP4056 Charging Module w/ Micro USB port similar to these: https://www.amazon.com/Kiro-Seeu-Mirco-USB-Protection-Functions/dp/B09B27V7XZ Battery contacts used are similar to these: https://www.amazon.com/gp/product/B072379C1R The models with "2" are for battery only. The models with "3" are for either BF-888S radio or battery charging. The "B' models are a cover for the circuit board box. The "C" models are for versions of the charging circuit board that have a 3mm lip extending beyond the Micro USB port and an overall length of 29mm. The charging circuit board are described as having 17x26mm dimensions. Experience has shown roughly half the boards delivered are actually 17x29mm & have the 3mm lip. Choose the model that corresponds to the board you plan to use. Material type is not important as long as the machine is tuned to print with accurate dimensions. During assembly, I used CA glue to affix the battery terminals to the model. 26mm boards will slip fit securely in the box portion between middle stud & USB port wall. 29mm boards may require securing with something like servo tape. The circuit box lid should be a slip fit. CA glue can be used if necessary to keep it secure. Orient the box lid with the grid over the charging circuit board LED's. The red LED will light during charging, replaced by the blue LED when fully charged. If idling, the blue LED will be lit and the red LED faintly flashing.