Yeah, I love this keyboard! The typing experience is awesome!
I think the issue was with the backlighting. Yesterday, after charging it, it dropped from 100% to 80% quite quickly, which was a bit worrying. But since I turned off the backlighting, it's still at 80%.
I'm also glad that there's no difference now that I've switched to a Bluetooth connection. If this helps with the battery life as well, then that's great.