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document updated 2 months ago, on Mar 26, 2024

3.7v lithium-ion batteries (eg. 18650's)

flashlights

The batteries must be field-replaceable.

Reviews of 18650 flashlights: [1] [2]

Amazing database of different 18650 flashlights. [21700]

Another database of different 18650 flashlights [21700]

power banks based around USB or QC 3.0

power bank that outputs 12 V instead of QC 3.0

This could be used for all kinds of things, including RV fridges, semi-truck microwaves, you name it.

  1. the power converter — [1] [2] [3, 300W] [4, 138W] [5]
  2. several cigarette-lighter sockets in a row — TODO
  3. 3- or 4-slot 18650 battery holder(s) — TODO

Other things you could use 18650 batteries for

Full list of 3.7 volt batteries

Some of the more common sizes are 16340, 14500, 18650, 21700, and 20700, but there are many others available.

A more complete list might be — 18650 26650 21700 14500 16340 10440 16340 14650 18350 18500.

I currently own 18650's, and may buy some 21700's, since they work in both my charger and my USB-C power bank.

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