In this video I've build a 3 cell RC battery pack out of 18650 cells. This is an inexpensive way to get decent battery pack for your models.
It can be even cheaper if you manage to source the cells out of an old laptop battery.
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Schematic:
https://easyeda.com/bkolicoski/RC_Battery_Pack-18037a6f790f40318a49a57500f1d6a1
Instructables article:
https://www.instructables.com/id/RC-Battery-Pack-With-18650-Cells-3S1P/
Materials used:
3 x 18650 battery cells - https://goo.gl/WHU36K
1 x XT60 connector - https://goo.gl/tLDDWm
1 x JST-XH ballance connector - https://goo.gl/t9ga8E
Solder tabs - https://goo.gl/BuJkjx
Tools used in the video:
Soldering Iron - https://goo.gl/oxXFVX
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Music:
Fresh by MBB https://soundcloud.com/mbbofficial
Music provided by Free Music for Vlogs https://www.youtube.com/watch?v=Msjj1fqSEwg