Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month
Cheap (considering free shipping with only one piece of it)
Small, compact form (fits 18650 cell)
Cutoff voltages could be more...considerate. I'm afraid the battery taken to these voltages will die fast - but IT IS ONLY PROTECTION - not charger. It is supposed to be the last protection against fire, explosion... when normal charger breaks or when something short-circuit the cell
After connecting to battery you have to "kick it" with charging voltage to activate.
Cutoff voltages can be seen in my video.
Good as protection circuit - not charger!!!
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