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We wanted a nice simple way to do a quick check on our torch, light, and suit battery packs so made some simple voltage checkers, a small 3cm x 4cm body containing a three digit voltmeter

These obviously only check voltage rather than being a true capacity checker but it will at least give a basic check of battery level

These voltmeters are tiny, 23mm wide by 10mm tall with 7mm digits, and are small enough to be built into the battery packs, which is what we may do in future

Two battery checkers showing voltmeter display

Plug in voltmeter - all our battery packs use the same gold plated connectors so they would work with any of our canisters