Whoa, that's a thirsty one. I've noticed this too; if your Zigbee mesh is really strong then I've found the batteries last for ages, especially if there are IKEA repeaters in there. However, if there's interference or the mesh is a bit weaker, they can drain the battery in no time.
I had one on my security mesh which is older equipment. The battery was dead overnight. Moved it to my accessories mesh and linked it across with Hub Mesh and it's been fine for weeks now.
The two in my study (where there's plenty of interference) have lasted for a month, but both were dead today. I've just replaced their batteries and I had to rejoin them.
Also, I've checked again and there's still no sanity in the battery data reported. I think I'll remove that information from this driver and rely upon the hourly reporting for presence. Anything else is fiction until the battery data can be deciphered.