Dummy battery pack for cameras (7.2V)

thingiverse

This is a high-capacity battery pack designed for cameras using 18650 li-ion cells. It can only be used with cameras that have an original battery voltage of 7.2V or 7.4V. If it doesn't work, charge the assembly to balance cell voltages and then it should function perfectly. The fully assembled weight is approximately 370 grams. See pictures for more information. You will need the following components: Four NCR18650 li-ion batteries One cold shoe adapter with a 1/4" hole (see picture) One cold shoe adapter with a 1/4" bolt thread One 1/4" x 16mm bolt with an 11mm hex head and 20mm length One 1/4" hex nut with an 11mm head and 5.5mm height Four M3 insert nuts (5x6mm) Four M3 x 10mm bolts One MSS22D18 switch One 2S capacity indicator One 2S 18650 battery protection board Four pairs of 18650 battery contacts One 4017 male connector One USB-C board connector One MT3608 DC-DC Adjustable Boost Module 2A (adjusted to 8.4V) - read important info carefully See pictures for more information. Additional materials needed: Some wires, superglue, hot glue gun, and soldering tools. Important Information about the MT3608 Module: Watch a video at 16:35 (micro USB version only) To work around the unaltered circuit, turn the potentiometer adjustment screw counterclockwise by 20 turns before connecting power. Apply only 3 volts of power initially (such as two AA batteries) while adjusting everything. By default, the assembled and shipped module has the potentiometer wiper set to about three-quarters of the way up. If your power supply is 13.8 volts, this will apply approximately 9 volts to pin 3, Vfb, of the chip, killing it instantly before you can start. Probe the center wiper pin of the potentiometer on the back of the board and check the voltage. When the unit enters control loop regulation mode, this voltage will be right at 0.6 volts. If it's above 0.6 volts, it's just passing input through to output without any boost. Carefully adjust the potentiometer clockwise to bring the voltage at the output to 8.4V. Only then can you safely connect the input to whatever higher voltage power source you're boosting from. https://youtu.be/VJkwtaycELk?t=995