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Old 12-20-2019, 12:02 PM   #16
dmurphy
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Join Date: Dec 2017
Location: New Jersey
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Quote:
Originally Posted by TahoeJoe View Post
When mine went red they still would hold 70V too, but they still turned red. If the rene_canlas recovery method did not work for your battery, that means the cells are too far gone to revive. The next recovery method would be replacing the bad cells. That would move you over to this thread
I let the battery packs sit disconnected for about 2 weeks. They continued to drain down to about 15V.

Then I put them on a DC power supply and very slowly brought them back up to 60V over the course of about 8 hours each.

Put them back on the Segway .... and ... we're back! All is good on the Western front.

Batteries charged up fully, went through cell balancing and now in trickle mode.

InfoKey is showing full charge, Segway rides great ...

I suspect (and it's just a guess) that either the charger or the in-battery BMS's locked up somewhere while it wasn't ridden.

That continual drain while disconnected leads me to think the BMS was doing something funky. But now we're all healthy it appears, so good to go!
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