Got a HR92 that's reporting a low battery.

In my annual get ready for Winter jobs, i've swapped out all the batteries in the HR92s for new Lithium AAs. The HR92 in question wasn't reporting a low battery beforehand.

After changing the battery setting to Lithium and swapping the batteries I keep getting a low battery notification, even though the HR92 shows a 3 bars on the battery. Tried tensioning the connectors etc.

Any ideas?