We have BlueCurve and 2 remotes (XR11, fw 1.1.3.8.).

When using fresh NiMH batteries, both will show depleted battery warnings within a few days, yet continue to function for weeks. 

If the batteries are removed on the first warning, they recharge within 20 minutes.  This indicates they are not depleted. 

Is it possible that these remotes are sensing battery voltage, and give false warnings due to NiMH batteries being 1.2 v, whereas alkaline batteries are 1.5 volts when fresh?