Pull tab adhesive on battery

Hi,

Does anyone know what the battery pull-tab adhesives are inside macbook pro 2019 and where I could purchase one?

Long story short, (I naively thought) my only option was to open and check the battery of my 5 month old mbp that stopped turning on (as I moved country and couldn't avail of my warranty at home) and I was advised I would need to pay $700 to fix in the country I'm currently residing.

During this very short process of me testing the battery inside, the adhesiveness of the black tab over the battery got weaker and so no longer sticks. I know opening the mac 'voids warranty', but I now can get it back to my home country (after a lot of effort) to send back to the reseller I purchased it from- as I want to try avail of said warranty. The only problem is I'm worried about that little black tab and how it is no longer sticking, giving away the fact I opened the back up.

Does anyone know if this is a major cause for concern re warranty and if so, how can I fix it:(

Big regrets now obviously for opening it at all but it felt like no other option at the time. Hindsight..

(On image attached, mine was stuck to this black cover when I got it from the reseller, so only the tab part I need to replace)

Thanks
Steven