What is "I10" on this table of charging data?

[windsock]

G'day. A question for the electrical/electronics brains trust.

I have come across a term I am not sure about in a manual covering some big flooded lead acid batteries. What is I10 as in "6 x I10" in the diagram below. It is not clearly defined in the battery manual. It relates to Hoppecke batteries and their charging requirements. It is stated as a requirement in a few places. Third row, sixth row and last row of the table below. The C10 rating of the batteries is 915Ah. 1220Ah, 1145Ah, 1063Ah, and 790Ah is the C100 C50, C24 and C5 ratings respectively for the 8OPzS 2Volt cells I am working with. I am wondering if I10 is the charge rate of 91A, this 91A being the 10% of this C10 rate. If so, 6 x 91A is a huge number and this is causing me some confusion. A possible indication of what I10 is a reference to I10 in the second diagram below. However, the reference is in subscript in this diagram and in the table it is I10, as in no subscript. Is this lack of subscript a formatting a typo or is I10 a complete different number?

Anyway, are there any more better informed interpretations out there?

182908

182912

[windsock]

A follow up: I wondered if there was anything of use in the manuals of other Hoppecke batteries. Turned out there was.

There appears a table of "Notation of Nominal Data" missing from the manual for the batteries I am working with.

In is defined as the nominal current at the discharge rate of Cn. The table I found in another manual states that "In is the Nominal Current: I5 (see nameplate) = Cn/5 h". Therefore the "I10" is a typo and should be I10 which in my case is the C10 rate of 915Ah so I10 is the nominal current of 91.5A.

If I am reading my table right that means the maximum recommended charge rate for these things is something like 549A! :Thump: