Xiaomi Aquara temperature sensor drags battery empty very fast

I’m using an Xiaomi Aquara sensor outside to measure temp/humid. I use it for about 2 weeks now and the battery level already is at 48%. I don’t think it’s normal that battery get low that fast? I’ve expected it to last at least one year, if not longer…

Is this the battery that came with the device or one that you purchased elsewhere? It is known that the default batteries are not always full and run empty quickly.

It’s the one that was coming with the device. So i guess i should by one in advance…