Finally bought the replacement battery for my Blue iBook. I had one in my Tangerine iBook and it was doing well after a full year. (I use it very infrequently) The new battery is 5200 mAh versus the old 4400. When first charging, it took a good 15-20 minutes to get off 0%. But then it moved very nicely up to 100%. This iBook boots to either OS 10.3.9 or MacOS 9.2.2. Images for both are below..
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Following images are LinksPro Golf running macOS 9.2.2 on the same iBook.