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Took apart my sisters ipod touch 2g… (replacing the screen). Took the battery off with a small metal, screwdriver and the battery got a bit marred (“streaks” on the back where adhesive was) But I might have a small puncture in the plastic of the battery (1/64 inch) The plastic is also very slightly puffed up around the batt, just like it got pulled a little by the adhesive Should I be concerned? I slapped some Electrical tape on it and around the tiny puncture…

Thomas, yes you should be concerned. If a battery’s outer case is punctured, the lithium inside is highly volatile and will react violently with water, this includes humidity in any room. You are now running risk of fire and explosion. Replace the battery immediately and dispose of the broken one. Stay safe, good luck.