Portable adjustable power supply (built-in battery + external power supply)
Print Profile(2)
Description
This is a portable adjustable power supply, using SK120X as a digitally controlled transformer, with an output voltage of 0-36V and an output current of 0-6A
It has 4 built-in 21700 batteries, and a switch controls power on/off and power supply mode
Features:
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Assembly Notes:
Wiring Diagram:
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Materials (Specific models are in the pictures, click to jump to the link I have selected the corresponding product's AliExpress and Taobao purchase links. Given that products may be discontinued or have price changes in the future, you can also choose the same materials based on the model number yourself):
SK120X Digital Control Buck-Boost DC Adjustable Regulated Power Supply 
AliExpress Link（Color: SK120X）
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21700 Lithium Battery 4-Series Lithium Battery Protection Board (Overcurrent > 10A, the larger the better to reduce heat) Lithium battery holder: printed part, can be found in the print profile
AliExpress Link（4S, 16.8V fully charged） |  |
 AliExpress Link（Color: Self locking ONOFFON） Six-pin three-position self-locking switch, do not choose the self-resetting type
*Do not choose illuminated switches, this wiring method will cause the illuminated type to stay on constantly |  |
Amass XT60E-F Two pieces  AliExpress Link（Two pieces, plus matching screws and nuts） |  |
Type-C Buck-Boost Fast Charger（After purchase, trigger 12V, 20V fast charging protocol by shorting contacts）  AliExpress Link（Color: 4S 4.5-21V 18W 25W） After purchase, trigger 12V, 20V fast charging protocol by shorting contacts |  |
4MM Banana Plugs (2 pieces, red and black, for output)  AliExpress Link（Choose two colors: black and red） |  |
Battery Indicator Light Board (16.8V, connect directly to battery positive and negative terminals)
AliExpress Link（Color: 4S 14.8V） |  |
M2x8 Screws (10 pieces, for fixing the charging board and back plate)  AliExpress Link（Size: M2X8） |  |
M4x12 Pan Head Tapping Screws (2 pieces, for fixing the handle)  AliExpress Link（Size: M4X12 (50pcs)） |  |
*As a power supply enthusiast, I have bought and assembled countless power supplies and power boards, including various buck, boost, and buck-boost converter boards, as well as ZTE 2400, battery swap cabinet power supplies, etc. However, a portable power supply allows me to use it for emergencies outdoors, for outdoor lights or T12 soldering irons, etc., and of course, it can also be used for emergency charging when car or motorcycle batteries run out
License
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.
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