Is this "stuff" on the battery concerning?

Question

iPad 2

The second generation of the iPad with Wi-Fi, GSM and CDMA models. Some models were refreshed before the iPad 3. Repair is difficult and requires heat and prying. Released on March 11th, 2011. Model numbers: A1395, A1396, and A1397.

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Tyler @tyler34860

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TyTech Media Corporation

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Postato: 6 set 2017

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Is this "stuff" on the battery concerning?

There is some for lack of a better word "stuff" on my iPad's battery. I am just replacing the screen but would like to know if this should be concerning and/or if I need to replace my battery

(picture below)