If it was me, I would make a box from plywood, glued and screwed together. Might even be better looking than the plastic one....I have a 48v hailing battery arriving for my Vulcan tomorrow. The controller box I ordered is coming from China so could be a while. Anything I could use in the meantime that's sturdier than a crappy frame bag?
If you need to cool the battery, but I must admit that in almost 10 years of e-biking I have never noticed much heat from any of the Li-ion batteries I have owned, but naturally, if your battery does get hot and that it is a concern, small holes, low down and maybe a tiny fan (CPU Type), should sort that out easily. See here:-Heat is your number two enemy, water is your number one enemy. With those factors in mind:
- Plywood does not conduct heat.
- if you use a bag it must be big enough to contain plenty of air
- bags need to be vented without letting water in
- commercial plastic controller boxes get hot inside
That's the box coming from China, just got it in a frame bag for now. It's only a 13a controller (pulls 16a according to screen though) so shouldn't go into meltdown that easy. Besides it got hot enough in the phlyion box to melt my bullets closed and still works fine