Ensupra Electricity Usage Monitor: Battery Change

Replacing the memory backup battery in an Ensupra electrical power meter.

I think my battery has been dead for many years as I never recall that it had an memory feature. I'll see how this one works and if it starts to fail, maybe there's something wrong with the charging circuit.

Symptoms of a bad backup battery:
1. Loss of readings during power outage
2. Unstable voltage reading
3. No power reading
4. Loss of display

@Lawrence Francis: Kuman power meter repair - NiMH battery replacement
https://youtu.be/JRNuHORo3bE

Tear down video for a 220V/UK version:
https://youtu.be/aAGSXiZKfIE

Link for battery, 3.6V, 20mAH NiMH:
https://www.ebay.com/itm/233878211171

More to come...
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Intro/Outro:
Louisiana Fairytale by Austin Rogers
https://web.archive.org/web/20170402222425/http://drfiddle.com/show_tune.php?id=94