A Better Battery Box, Part 1 - Mistakes - How to build a 48v Lifepo4 battery (Ep. 25) @TheDigitalMermaid
A Better Battery Box, Part 1 - Mistakes - How to build a 48v Lifepo4 battery (Ep. 25)  @TheDigitalMermaid
Uploaded December 2021 | Updated September 2026, 3 weeks ago
First, sorry for taking so long to get this video out. I wanted to finish the new box so that I knew how to make the first part showing the mistakes and restarts. That, by the way, is the theme of the entire episode. This was a really hard one to make for a number of reasons.

Thankfully, the next video is already shot, the box is done (yay!), and I just need to edit Part 2.

0:00 - Opening at the end
1:03 - The real beginning is another restart
1:46 - The design of the new box
4:02 - A Choice of BMSes
5:15 - Main disconnect switch position
6:08 - Graph paper and calculators!
8:08 - Cut sheet, and cutting!
10:48 - An old offer
11:19 - A kitty interlude - Kepler!
12:15 - Saws in the living room
14:47 - Accuracy on a cheap table saw
18:00 - Splines!
19:33 - Dropping the riving knife on a Dewalt construction site table saw
20:00 - Cutting the spline rebates
23:25 - The start of the first problem
26:37 - Sleeping on the problem, finding a fix
27:41 - Onward; Glue-up and clamps
29:42 - Fingers and glue, a warning
34:31 - A couple of notes
34:55 - I need more clamps
35:10 - Cleanup and fairing
35:51 - Ready to test!
37:16 - Sadness, kitty comfort, and resolve!
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A Better Battery Box, Part 1 - Mistakes - How to build a 48v Lifepo4 battery (Ep. 25)

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