Japanese Tamagotchi IDL help with odd compartment inside battery area

[Makikofire]

Japanese Tamagotchi IDL

Inside the battery compartment is another compartment (pictures provided below) that (after a search left me empty of info) brought me back to the forum I used and helped me out with info when I got my new Tama last christmas ...I hope someone can shed some detailed light on this cause im confused..

 

[Eternal Mametchi Fan]

Well, I've seen that little compartment thing on my iD L but I never opened it. I'm not sure what it's for, but I assume it was just made like that for some manufacturing reason.

 

[Makikofire]

So not for debug or maybe translating? hmm still leaves me wondering I wish someone knew for sure...

 

[binary]

The compartment and the contacts within are same on the Tamagotchi iD. Some information about them can be found here: https://tama-zone.com/index.php?showtopic=24598&view=findpost&p=3416524