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I explained the standard 18650 charger "TP4056" and made it myself. I also explained how to use it in parallel and in series. I ordered the board from PCBWAY https://www.pcbway.jp/ ◆ Please follow me on Twitter! / hstadio Products introduced in the video ★ Lithium battery charger board USB Type-C TP4056 5V 1A 18650 with overcharge protection function https://amzn.to/3lPlmR0 ★ 18650 charger PCB BMS protection board for 3S 10A lithium-ion batteries https://amzn.to/3lQ0lpc ★ 5V 1A boost step-up voltage conversion charging protection board 134N3P https://amzn.to/38qgLSa ★ 18650 battery box 10 pieces 3.7V battery case https://amzn.to/3wWYw0l Using Amazon Associates 00:00 TP4056 specifications explanation 03:41 How to connect in series (parallel connection precautions, etc.) 06:00 Measuring voltage and bias in series connection 07:20 Making your own TP4056 module 07:51 Manufacturing cost 08:10 Soldering time 15:13 Soldering completed (I felt like I hadn't expected it) 16:38 Conclusion ◆ [Electronics] Making a DIY vacuum tube VU meter kit [DIY] • [Electronics] Making a DIY vacuum tube VU meter kit [DIY] ◆ [Dangerous electric shock] Do not measure voltages with a tester [Electronics DIY] • [Dangerous electric shock] Do not measure voltages with a tester [Electronics DIY] ◆ [Junk] Repairing a high-end MD deck with a faulty power supply [Hard Off] KENWOOD DM-5090 • [Junk] Repairing a high-end MD deck with a faulty power supply [Hard Off] KENWOOD DM... ◆ [Electronics] Making your own PC audio with a USB-DAC [DIY] • Video ◆ [Junk repair] Super easy way to repair a 550 yen Canon printer B200 error MG7130 [DIY] Hard Off • [Junk repair] Super easy way to repair a 550 yen Canon printer B200 E... ◆ [Junk] Repair a Canon printer that won't turn on [Hard Off] • [Junk] Repair a Canon printer that won't turn on [Hard Off] ◆ [Junk] Repair a DIGA BD recorder with a non-working HDD [Hard Off] • [Junk] Repair a DIGA BD recorder with a non-working HDD [Hard Off]