Unused Smart Keyboard

That keyboard has a built-in flat lithium-ion rechargeable battery similar an iPhone, so it should have a pretty good shelf life. Plus like Allen say's, that keyboard is a sealed unit and opening it to removing the battery would surly destroy it. see > https://www.ifixit.com/Teardown/Magic+Keyboard+Teardown/50995

From limited product information available, these appear to utilize power from the iPad

and (if so) have no internal battery. ~ These use magnetic 'smart connectors' to attach it.

• Use your Smart Keyboard Folio or Smart Keyboard with iPad Pro - Apple Support

https://support.apple.com/en-us/HT205237

There's a user discussion with issues/answers from the Community (3 pages) on this item.

Any other application of Smart Keyboard would likely utilize similar information, ask Apple.

• Can Smart Keyboard be connected to iMac? - Apple Community

https://discussions.apple.com/thread/250219839

• iPad Pro Smart Keyboard Replacement - Apple Community

https://discussions.apple.com/thread/8553331

This product has limited one-year warranty; but may qualify for more if bought with iPad

and covered by AppleCare+ plan. ~ You'd need to ask product specialist at an Apple store.

"is there an option to remove the batteries?"

Not sure. I've only had mine a few months and use it every day. Also am traveling so can't look at mine for about 10 days!

Can't find any takeapart links but I did not have time for a thorough search. Try using the strings "magic keyboard takeapart" and 'magic keyboard remove battery" to see if you have better luck.

Based on past Mac keyboards with a similar form factor, my first thought is no. Most of the previous aluminum boards could only be opened by destroying them. If no one else has a better answer, it's probably time to ask at an Apple store or call on their support lines.

The "Smart Keyboard" is for iPads. Do you mean the "Magic Keyboard" that ships with newer iMacs? They have rechargeable batteries built in