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How To Build Your Own 18650 Li-Ion Cell Charger
In this video I show how to build your own simple DIY charger for Li-Ion (Li-Pol) batteries using parts of a dodgy Chinese charger. It works with 18650 and AA sized cells. The Chinese Li-Ion chargers are very cheap ($1 - $2 including shipping), but their power supplies are often dangerous. So it may be a good idea to remove the questionable internal power supply and hook it to a safe external power supply of 5V. USB phone chargers are probably the most suitable sources of 5V power.
WARNING: Mains voltage is dangerous. Risk of electric shock and death. Li-Ion / Li-Pol batteries can explode or cause fire. You are doing everything at your own risk.
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