Is there a secondary battery that store date and time etc.?

[steveLONDON]

You know in the old portables you had a removable battery and I think there was a separate smaller battery that could not be removed that would store your date and time and some other settings in the event of total power loss.

Do the latest MBPs still have this and if so, what's the correct term for it?

 

[DivineEvil]

Nope. They have only 1 big battery! I know this, because I've unplugged my battery to perform a mod, and when I started the OS again... the date/time was lost. Hopefully the minute I went online it got updated! Though I had to change my timezone.

 

[murdercitydevil]

You know in the old portables you had a removable battery and I think there was a separate smaller battery that could not be removed that would store your date and time and some other settings in the event of total power loss.

Do the latest MBPs still have this and if so, what's the correct term for it?

if the logic board is anything like a regular motherboard, there should be the equivalent of a CMOS chip which stores things like that, but I kind of doubt it.