That's the case right now if you're on the hunt for a keyboard, since the Surface Keyboard (1st Edition) is a better bargain than its successor that just launched. I've used a Surface Keyboard ...
The battery lasted me a good amount of time, I spent a few days working on the Microsoft Surface Laptop 5 which meant hours at a time bashing on the keyboard and clicking around the web.
This keyboard is only compatible with Surface Pro X. The numbers in the image ... Press and hold the top button of your pen for 5-7 seconds until the LED light flashes white to turn on Bluetooth ...