What kind of slot is that on my laptop?

Hello, I removed the battery from my laptop today to install a new one and discovered this slot. Does anyone know what it's good for?

Can you go a little closer I almost see what!

Which laptop? Slot for SIM or SD card vlt?

Could possibly be a slot for a SIM card.

Just get the card out, because there's apparently one inside.

Could be the slot for the docking station.

No, there are 2 hollows, above and below. See if you can pull something out there. Maybe to use something (e.g. Bios battery, SIM card or the like)

This is a SIM slot for a SIM card. You can use this function if a suitable mobile modem is plugged into the laptop. You can use it to access the Internet via a mobile network. If there's only a 2.5G or 3G UMTS modem in the device, then you can hardly or no longer use it anyway. Nowadays you mostly need a 4G LTE modem. The card in the SIM slot could be a SIM dummy, as "dirt protection" for the contacts.