Chip broke from motherboard during battery removal

I was having really bad battery life on a 15 month s7.

Battery would be at 60% and then just shut off. Upon starting up, it was at 1%.

I'd also have times where it would just restart the phone and keep the battery life that it restarted with.

I ordered a 3rd party battery and having done some minor phone repair in the past, decided to tackle it using a video on this website.

Upon using a spudger to remove the connector for the battery, a small chip decided to effortlessly remove itself from the board.

When all the covers are on, it is the small black rectangle/with thin line on end, directly left of the camera. It's literally the only chip in sight before removing any of the 3 black covers.

What does this chip do? So far the phone is operating with no issues, but I imagine it does something. Can it be re-soldered if the full board is removed?

Thank you in advance to anyone that has the time to answer this, with the knowledge to know what that chip is used for.

edit:

image attached (no idea why it's inverting the colors, as the images on my computer look fine) chip is marked with a red outline.

Great job folks.

Thank you.

Given that my phone seems to be running good without it, do we know what it actually does, or is related to?

As well, I have intermediate knowledge experience with soldering things like Playstation2 mods back in the day, etc, but my understanding is that this soldering is done at more of a precision micro level?

The soldering I've done is indeed pretty small/finicky, but was more related to soldering small wires to capacitors and really small legs on microchips, not actually installing the parts themselves.