Electric Dirt Bike Build Ep 5 | The Most Critical Step in Battery Building (That Most Builders Skip)

In this video I build a large-scale lithium-ion battery cell pre balancing rack using scrap metal and 3D printed parts.

This rack is designed for 18650, 21700, and 32650 cells, allowing them to be connected in parallel for bottom balancing before assembling a full battery pack. I printed over 1000 individual components for this build, including cell holders, bus bar supports, fuse holders, and spring-loaded contact sleds.

If you're building a DIY battery pack for an e-bike, electric dirt bike, or other EV project, properly matching and balancing your cells is one of the most important steps. This setup allows for consistent internal resistance testing and reliable pre-balancing across a large number of cells.

All parts in this video were printed on the QIDI MAX4 3D Printer. I used PLA for this build to keep costs down, but the machine supports a wide range of engineering filaments for more demanding applications.

Time Stamps
00:00 - Intro
01:25 - QIDI MAX4 Combo
05:45 - 3D printing rack components
07:18 - Building the rack
10:08 - Assembling cell holders
12:18 - IR tester
12:48 - Installing cell holders
13:07 - Making copper bus bars
14:32 - Wiring

Get the QIDI MAX4 here:
https://ca.qidi3d.com/products/max4?sca_ref=11148944.TOUShsmguDkMuY

E-Dirt Bike Build Series:
https://www.youtube.com/playlist?list=PLdO3Wk-XPC_BQ7GYUZqXf11yAac_USfDP

Website: https://www.resystech.com

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