NESE battery testing update
Pinging @Agniusm
I cleaned up all the cells with a dremel. Put them in the new 12s6p modules I had purchased, and built the battery:
The new cells I had replaced last time looked good as new, so I didn’t even touch those. The middle arcing spots I couldn’t remove from some of the cells, but the surface was clean (I used the polishing dremel attachment), so it looked good enough. (Forgot to take pictures, sorry!)
Due to its size I could only put a thin layer of foam underneath the battery, and some foam blocks on one side in the enclosure. This is a vibration survival test after all, so don’t want to baby it too much. The packs are wrapped together with fiberglass tape the best I could.
24h later (to let the blue threadlocker cure) I went out on a test ride. (Note that a lot of the road was very bumpy, my helmet was even shaking! But I turned on video stabilization when editing to make the footage more watchable. Would have recorded on the 360 cam, but unfortunately I broke my selfie stick while doing the april fools antenna joke lol )
and as my luck would have it – at 14:30 one of my Moon gears broke. Great 
Need to get some steel gears asap. I wasn’t even doing anything that extreme, so I’m very disappointed.
Anyway, I got back home, and opened up the first 3 modules to check on the cells. The very first module contains the new cells, so any signs of arcing on those would mean a failure. Aaaaand, look what we have –
Even the new cells now show that middle arcing point pattern:
I will disassemble the battery fully a bit later and take pictures if there are cells in even worse condition. But yeah – I think I’ve lost my faith in NESE… I might still use them, but only with a thick layer of foam around them to protect them against vibrations.