I have the above as well as the RTL515 but getting very poor battery life. Barely 6 hours if that. I’ve also experience a freeze of the device requiring a reset. I’ve tried to add the list mileage but can’t. Overall very disappointing. Considering selling it on and go back to my iPhone and Cyclemeter. Before I do any suggestions on what can be done to enhance the battery life given the fact that it’s paired with the RTL515.
