A quick tear down of a solar rechargeable yard light. These can be connected in a series to power up an outdoor device or be used as a portable solar battery pack. I did a bit more research and found that the 4 pin device is an ASIC LED driver made specifically for solar LED lights.
Here's another video with an explanation of this device:
https://youtu.be/VyZM4pEWG3o
Be sure to check out these other "Nerd Thunder" contributors on YouTube.
Jeri Ellsworth: https://www.youtube.com/user/jeriellsworth
Becky Stern: https://www.youtube.com/user/bekathwia
Ben Krasnow: https://www.youtube.com/user/bkraz333
John Schuch: https://www.youtube.com/user/HackersBenchTV
Darren Landrum: https://www.youtube.com/user/dmlandrum
Joe Grand: https://www.youtube.com/user/kingpinempire
Mark VandeWettering: https://www.youtube.com/user/brainwagon
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