111/112 has been seeing an abnormally high failure rate on our 2023 batch MK Batteries while charging. Batteries were purchased mid-February, and we have had 5 of our 24 new batteries begin to leak from the top weld seams or terminal potting so far. We do not suspect that this is a result of contact damage in our battery trays.
Wondering how many other teams have been seeing this? I have heard from a few other teams with similar issues, but nothing stated in a public forum.
We haven’t had an outside visual failures but had one of our new ones internally fail. Plugged it in in the pit, walked out to the field. Loaded onto the field before the match and turned the robot on. Read 12.4 volts. Before the match started it was down to 9 volts. Wont charge or hold a charge now. Had three matches on it. Always keep a spare on the cart now.
Similar issues to us, we bought 16 new mk from Andymark at the beginning of the season. 5 failed our CBA testing, of the rest one failed us during competition with brownouts after 30 seconds. Unfortunately we we too late to get them tested for the return policy. Of the remaining 10 only two are close to our 4 and five old batteries in performance per cba testing. We have not had any leak yet.
Just as another datapoint, we bought 4 MK batteries this year, from 3 different suppliers.
Out of those, 1 passed our acceptance testing.
That one has since been rotated back out of service for re-testing since we saw early brownouts with it.
I am unsure if they are X variants or not, but we will definitely be doing more testing in the offseason to determine how we can get the most out of these batteries.
Depends on the amount and color. If you’re seeing a small amount of something that’s yellow-green-clear IN the seam that’s likely the seal/glue holding that seam together. If there’s anything coming OUT of the seams that could be an issue.