When should I replace the batteries in the RS1xx LoRaWAN temperature & relative humidity sensors?

When the battery capacity indicator shows a value of 2 (out of 5), this should be taken as a warning and the battery should be replaced soon. Once the battery capacity indicator decreases to a value of 1, the batteries should be replaced immediately. 

The sensor will operate down to a capacity of a value of 0, but the time for the battery capacity indicator to decrease from a value of 1 to a value of 0 will be much quicker than the time it takes for the battery capacity indicator to decrease from a value of 4 to a value of 3, for example.

Note: As the battery nears depletion, it can be expected that LoRaWAN communications may be intermittent or fail.