iFixit Replacement Battery Strong Fruity Smell (Twice)

My original MX Master 3s battery was failing, so I ordered a repair kit from iFixit. When the kit arrived and I unsealed the battery, I noticed it had a very strong and somewhat unpleasant fruity smell, which the battery continued to smell like for multiple days. From doing a basic lookup, I found this can mean the battery is leaking and unsafe to use. This does seem to be true as while I couldn't see any super obvious damage, an odd dark residue had started forming outside one corner of the battery after a few days. I brought my problems up to support under the battery's warranty and I got sent a replacement, but upon opening this one up am I once again greeted by the same distinct scent as before. Is this just normal, or have I been sent bad batteries twice now?

This is a link to the kit I ordered