Watchface: Data Lover

You should enable "allow lat/lon override by GPS" in the settings...

This is exactly how it is set up.

Does the position that is cached is reset when the Connection to the phone is lost?

For me it is working like that. If I want fixed position for the weather, a have to input lat/long and disable "allow lat/lon override by GPS" in the settings. If I want position from the last activity, I have to enable "allow lat/lon override by GPS" in the settings.

Yes for me also but after a while that position taken from the GPS is "lost" and the watch is back using the saved location.

I wanted to know what is the behavior for the app to go back using saved location instead of last GPS fix (is it after X hours, after connection lost with phone...?)

try erasing lat/long from the fields, that is the only thing that I can think of...

there's a known issue on the 735xt that loses the cached value and is then reverted back to the default from the settings (I'm still looking in why it's happening on that device). Which device do you have?

I have a 945.

So the expected behavior is: once the GPS is used to get a location, this location will always be used until there is a new GPS fix (if we have allowed GPS to override on settings)?

Correct. 

the battery time calculation is not something that has been exposed to the connect iq api, we only have the percentage available.