/members-area/personalblogs/b/blog/posts/wemos-d1-battery-shield---charging-18650-li-on-batteryWhen 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...en-USTelligent Community 12https://community.element14.com/members-area/personalblogs/b/blog/posts/wemos-d1-battery-shield---charging-18650-li-on-batterySun, 07 Apr 2019 17:31:18 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:b60b4a58-9e02-4589-8009-a77956e79c9bneilk0<p>The prototype Temperature monitor ran in the greenhouse for just over 17 days before the battery ran out so I recharged, again from the mobile phone power bank</p><p>&nbsp;</p><p><span>[View:/resized-image/__size/957x435/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-b60b4a58-9e02-4589-8009-a77956e79c9b/5700.contentimage_5F00_190486.png:957:435]</span></p><p>&nbsp;</p><p>When I saw that the voltage had stabilised at 4.32V, I went out to the greenhouse to see if the blue light on the battery shield had come on - no!</p><p>&nbsp;</p><p>Next time I checked the graph, I saw that the voltage had suddenly fallen and was now around 4.23 to 4.25. Out to the greenhouse again, where I saw that the charging indicator on the power bank had gone out - it had shut down because insufficient current was being drawn. I disconnected and closed up the plastic sandwich box!</p><img src="https://community.element14.com/aggbug?PostID=6746&AppID=293&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/members-area/personalblogs/b/blog/posts/wemos-d1-battery-shield---charging-18650-li-on-batterySun, 24 Mar 2019 19:09:44 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:b60b4a58-9e02-4589-8009-a77956e79c9bDAB1<p>Nice post.</p><p>&nbsp;</p><p>DAB</p><img src="https://community.element14.com/aggbug?PostID=6746&AppID=293&AppType=Weblog&ContentType=0" width="1" height="1">