As I can see on your picture you connected all OK to revive battery.
yOU SEE once one of more cells goes into reversed polarity there is very little chance to revive 30 cells in series.
I had such case when I tried to help fellow Eplus owner here in my city - with no result.
You for sure know about Rick Ruggiero former production manager of EMS ,he still has Eplus parts for sale.
About 2 years ago he wanted US$1000 for almost new front wheel plus shipping. For sure he does not refurbish Eplus batteries I asked more than once.
Tell me,
is it 1000W , what model?
miro13carr