I have received the solar charged power bank I ordered for "scientific" purposes. I am interested in the electronics for charging the cells and the safety mechanisms for overheating.
The picture presenting "perpetuum mobile" is just a joke. I remembered the funny video where the guy connected the extension cable to himself, then took the piezo crystal from the lighter, sparked the ground stick and established "never ending energy circulation".
I was suprised, when the Power Bank arrived partitialy charged and seemed to have some capacity. I have connected it to phone and tried it with the probe. It has been charged by about 1 ampere and it charged 560 mAh before it died.
I am going to give it a few charge/discharge cycles and will measure it. I want to discover it remaining capacity. Then, depending on the capacity i will possibly diassembly it and will make some test of safety mechanism. My question is, what wolud it do, when you leave it under the windshield in your car to charge it in hot summer, to be able to use it then to charge your phone. Wait for my next steps :)
Jan "Jenkings" Škoda - blog
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