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When the final long term test of power consumption of my Wemos d1 mini temperature monitoring system was complete:   Power Consumption of a Wemos D1 mini ESP8266 - Long Term Test 3   I decided to try recharging the battery - from a mobile phone charger - whilst the Wemos d1 mini was still connected, so that I could monitor the charging process.   After charging the battery for just over 2 hours I had to go out, leaving the house empty, except for #sadiethecat1409 (Instagram). ...
Having returned from my holiday in the winter sun , I removed the battery from its holder and set about fitting the XH2-2.54mm female connector to the battery holder leads.   I then modified the sketch to reduce the drift in the sleep time which is evident in the chart from Long Term Test 2, repeated below:     I checked the battery voltage and was pleased to see that it still showed 3.74 V on my DMM. Rather than charge it, I decided to reconnect the Wemos d1 mini system and s ...