Up above, I posted two screenshots from an Xperia Z3 Compact (a very recent phone model, too) --
-- which *never* had AquaMail installed, and yet suffers from same "mobile radio active" battery drain, which started once it got the official update to 5.0.2.
This is a device I have here on my desk.
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I watched a "Project Volta" video from Google I/O last night... nothing.
The biggest thing is new APIs for letting apps and the system try to use mobile radio and WiFi and wakeups at the same time (to reduce the per-app overhead).
But this thing we're discussing here is something else -- it seems that the system puts the mobile radio into high power mode (when *an* app needs it to transmit data) and then it just stays that way, "stuck" for hours on end.