Bộ Pin MAK Kiểu Quân Đội 12V

12V Pb power bank, ideal to drive 12V COB LED light strips, i.e. in a gun safe internal installation, where no other power source may be available and the safety is valued.

Pb battery is much more safer than modern LiIon/LiPo batteries – due to significantly less fire-hazard involved, which is important when installed inside of a gun vault where firearm ammunition is stored. 7Ah capacity should be more then enough for many weeks of even months of short, not very frequent use (as it is in case of a gun safe usually; extended 9Ah capacity batteries are also available).

I recommend getting AGM deep cycle battery, which can be safely discharged to low levels (getting the most of its nominal capacity). Absolute minimum for such 12V batteries is typically 10.5V, however I would not go lower than 11.5V to keep the battery healthy and lasting long (check your battery specs though).

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Bill of Material

• printed parts (box, cover, switch protector)
• 7/9Ah 12V Pb battery (AGM deep cycle; typically 151x65x94 mm)
• 2 x XT60 Female connectors
• 4 x threaded insert for 3D printing (M3x5,7)
• 4 x bolts (M3x6 / M3x8)
• 0.56" DC 2-wire voltmeter (at least 0-15V range, 46x27mm mounting hole)
• 2-position switch with 12mm mounting hole diameter
  (the one I used: SCI R13-36A2-11-HPR)
• wires, connectors, etc. (pay attention to expected current draw)

Assembly

• Basic electrical knowledge is required to connect all components together. Although it is pretty simple do it at your own risk. I connected the voltmeter in a way that it is active only when the switch is ON (parallel to the XT60 sockets), so the battery is not slowly drained when the power is off. The switch itself is connected to the positive terminal of the battery (negative terminal is permanently connected to the XT60 sockets). Two XT60 sockets are connected in parallel, turned on at once.
• Glue XT60 connectors into the box with epoxy or good quality CA glue.
• Glue in the protector.
• Install threaded inserts into four holes in the box (usually with soldering iron, check YT for instructions).
• Connect the battery.
• Close the cover with four bolts.
• Test output voltage and polarity.
• Done, enjoy!

Printing

Straight forward, no supports needed if rotated properly on a bed (except for the voltmeter mounting hole overhang; but even there you may print it without supports as the voltmeter has a frame which will hide any bridging imperfection once installed).