This is a Battery pack for cameras via dummy battery using 18650 li-ion cells.
This can be used only with cameras which original battery voltage is 7.2V or 7.4V.
!!!! If it's not working, charge it after assembly to balance cells voltage, then it should work just fine !!!!!
fully assembled weight: 370g
THINGS YOU NEED
4x NCR18650 li-ion battery
1x cold shoe adapter (with hole 1/4"-see picture)
1x cold shoe adapter (with bolt like thread 1/4")
1x 1/4" x 16mm bolt (hex head 11mm) -16mm= thread lenght, 20mm= whole lenght
1x 1/4" hex nut 11mm head and 5,5mm height
4x M3 insert nut (5x6mm)
4x M3x10mm bolt
1x switch (MSS22D18 )
1x 2s capacity indicator
1x 2s 18650 battery protection board
4x pairs 18650 battery contacts
1x 4017 male connector
1x USB-C board connector
1x MT3608 DC-DC Adjustable Boost Module 2A (adjusted to 8.4V) -!!!!READ IMPORTANT INFO!!!!!
some wires, superglue, hot glue gun, soldering stuff
!!!!!!!!! MT3608 IMPORTANT !!!!!!!!
see video at 16:35 (it is only micro USB version)
The workaround for the unaltered circuit is to turn the potentiometer adjustment screw 20 turns counterclockwise BEFORE connecting power! Apply only 3 volts power initially (such as a pair of "AA" batteries" while adjusting everything, even if your final input is going to be much higher (like a car battery).
By default as assembled and shipped, the potentiometer wiper is about 3/4 of the way to the top. If your power supply is 13.8 volts, This will apply about 9 volts to pin 3, Vfb, of the chip, and instantly kill it before you can get started.
the center wiper pin of the potentiometer on the back of the board, and check the voltage. When the unit goes into a control loop regulation mode, this voltage will be right at 0.6 volts. If it is above 0.6 volts, it is just passing input through to output without any boost.
Carefully adjust the potentiometer clockwise to bring the voltage at the output to 8.4V.
then can you safely connect the input to whatever higher voltage power source, such as car battery, you are going to boost from.