Now look what you did.
You have awoken the beast.
Andrew has been going at it for 15min.
Hold on to your seats boys.
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Honestly I think I have just taken the brunt of bad batches of motors + the number of miles I put on my boards commuting every day.
Wheels are usually 7" Innova inline or 8" knobbies.
Torqueboard 6380s had a bad batch I picked up a pair in, magnet retaining clips came loose + permanent magnets werenāt properly adhered to the bell. Within 50 miles for the first and the second was at about 90 miles.
Maytech 6374 sealed 170kv motors, gen1. Picked up half a dozen of these, sent 2 to a friend and he immediately had issues with the magnets coming loose within the first 50 miles. I had similar issues with previous Maytechs so I did an experiment where I hardened my left motor at kept my right one stock/untreated. At approx 700 miles in the untreated right motor started making the recognizable ātwang at specific mid range of RPMā noise that is the permanent magnets coming loose.
I kept riding that setup until a few days ago, my untreated motor next actually failed but was making noise that I know to be the retainer ring coming loose. The left hardened one is still holding up fine. At approx 2600 miles on both.
@SeanHacker dropped in my 2 spare Maytechs from that batch and we were impatient and didnāt harden them, both starting the known āringingā noise within 100 miles. So overall 5/6 Maytech 170s fell to this condition, the only survivor was the one I hardened and recently retired.
Now Iām back on v1.2 Torqueboard 6380s that I dropped in that are supposed to be a bit more robust.
@taz Iām on the train and my internet sucks! Itās a struggle.
Edit: to throw in some more data, Iām officially retiring my custom 30q 10S6P pack I have in my LC carver. Itās at approx 4300 miles (6900 km) and Iām fail sure it has 2-3 dead cells after taking it up the hill a few times at Bakersfield this weekend. It was an ugly battery but a good battery, I managed to even underestimate a large puddle and the inside of my enclosure was best described as slightly soggy. I think if I hadnāt been such an asshole to it, it mightāve lasted longer. I was watching it sag to 31v at 80% charge on the hill though, and not recovering well. RIP little homey.
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Oh wow, even with pneumatics you had so many failures. Of course, one has to rule out the bad batches. Hopefully the newer motors would perform better than the ones in past. The ones specifically made for esk8(sealed). Seems like battle hardening helps a lot. Iāll probably do it then the next time I open them for a bearing change.
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Couldnāt you trace down the defective cells?
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Yes, but Iād rather build a fresh pack first. Iāll recycle the good cells in this one into another beater pack for testing. Once you have cells drop out itās a pretty slippery slope, Iām guessing thereās at least partial damage to a few in addition to the baddies. For a battery that cost me $200ish in parts to build I feel I got a lot of use out of it, itās gotten me to/from work for the last 6 months, and I definitely abused it.
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Commute internally here, I mostly push
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