How do I replace a battery operated keyboard?

Is this an Apple Keyboard that uses 2 Double A batteries ?? If Yes, that KB is Bluetooth and is it worked before - just change the batteries. With KB in front of you like you were going to type with it . On the far Left END of the KB >> look of Silver coloured round looking piece that has a Slit in it >> like a head of a screw. Use a dime to unscrew it and take to dead batteries out. Notice the + head of battery and how that come out. Reload the New Battery in the same direction as how they came out.

Done and on Right of the keyboard - Opposite end of battery compartment is a button - press it lightly and a Green light on the KB should appear.

Do you reallt need a wireless Keyboard?

USB KBs are cheap & far more reliable, btw you must have Bluetooth on your Mac, maybe not a high enough version for a new Apple KB?

Do you know what year your iMac is?

How do you correct the issue of low battery after you have replaced the AA batteries with brand new out of the package batteries? I have replaced them with different packs and restart the keyboard and I still get the low battery message and only 19% battery lie remaining. Is there a way to reset the keyboard?