I have 3 of these. 2 of them have a 4-LED "meter" (25/50/75/100% I assume but don't know for sure) and the other has a single colour-coded LED. Failing anything like that you would need a USB voltmeter and suitable load, so you can perhaps judge the remaining charge by the voltage drop, like this <https://www.amazon.com/Soondar-Charging-Concurrent-Real-time-Smartphone/dp/B00ORNOWZK/ref=sr_1_2?keywords=usb+power+meter&qid=1567695849&s=electronics&sr=1-2>
Otto
On Thu, 5 Sep 2019 at 13:09, Brent whodo678@yahoo.com [apple-iphone] <apple-iphone@yahoogroups.com> wrote:
Are you sure one is not already built in.. Check the manual or manufacturer.
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Posted by: Otto Nikolaus <otto.nikolaus@googlemail.com>
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