I submitted a new video to my local OSH group about modifying the 18650 battery shield v3 to add a load sharing circuit:
The shield has a circuit design flaw that makes it unsafe to use with projects drawing more than 60mA, and the mod fixes that. The video also presents alternatives for operating safely within the limits of the original circuit without doing the modification.
The basic problem is that when the USB charging brick is plugged in, current to charge the battery and power the load all flows through the TP4056 charger IC, which then fails to terminate charging as it should, which could be a safety issue. The load sharing mod has the brick directly powering the load so the charger can behave as it should.
I’ve nicknamed this module as the Shield of Turin because the second picture below reminds me of another Turin-related object that’s famous for how it looks in the negative.
I don’t have access to answer comments on Youtube, but can answer questions here.