IBook battery heating up - is this normal?

I just upgraded to an iBook from a Pismo a few days ago, and I've been taking it for a test ride.
I've found that the iBook battery seems to heat up very fast: after about 30 minutes to 1 hour, it gets quite hot on the top. I know the bottom is supposed to be hot (it seems all Mac portables have hot bottoms) but is the heat from the top something to worry about?
Strangely, my 6-year-old Pismo doesn't seem to put out as much heat as my iBook, although that might just be the casing design.

Its not normal, my battery is barley even warm.
Check this out https://depot.info.apple.com/batteryexchange/index.html?lang=en

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