00:00 Diagram Circuit 7.4V DC Battery Pack
00:09 Wires PCB Lithium Protection 2S for 2 Batteries 18650
00:19 3,7V + 3,7V = 7.4V/DC
00:29 Design Battery Pack with Battery Case
01:00 Lithium Battery Charger Output 8.4 Volt DC
01:04 Test Battery Pack
01:10 Protection Circuit Board with Epoxy Glue
02:31 Test Charger and Dischager
03:07 Test Short Circuit Protection.
03:30 Alternative charger the batteries 18650
03:40 Using Battery Pack 7.4 V for BIke Light and Bike Tail
