Hi,
The ETBeaconConnection documentation states that remainingLifetime will return an NSNumber with the days left of battery. I always get nil - after a successful connection. I found apost from April 2015 complaining about the same, with a response that this is a bug in the SDK, but then nothing.
Does anybody know how this is to be done now? - and can you post example Obj C code 
?
BR BT