Quantity   Component name
1 × LG cell phone battery https://www.amazon.com/BL-44E1F-EAC63320507-Battery-3080mAh-LS997/dp/B074PYGCYM/ref=sr_1_5?keywords=lg+v20+battery&qid=1576264838&sr=8-5
1 × Charger Board https://www.amazon.com/XCSOURCE-Lithium-Battery-Charger-TE420/dp/B01DRT4PWY/ref=sr_1_1?keywords=XCSOURCE+1A+5V+Micro+USB+TP4056+Lithium+Battery+Power+Charger+Board+Module+TE420&qid=1576264581&sr=8-1
1 × Power supply https://www.amazon.com/Control-Converter-Module-Charger-0-9V-5V/dp/B01MRG9CNM/ref=sr_1_fkmr1_1?keywords=XCSOURCE+PFM+Control+DC-DC+Converter+Step+Up+Boost+Module+600mA+USB+Charger+0.9V-5.0V+to+5.0V+Power+Supply+Module+TE110&qid=1576264790&sr=8-1-fkmr1
1 × On/Off switch two pin https://www.amazon.com/5Pcs-Snap-Position-Rocker-Switch/dp/B0725Z6FR7/ref=sr_1_4?keywords=2+pin+on+off+switch&qid=1576264492&sr=8-4