I received my Aqua Fish 2 days ago. Battery draining seems to be normal in comparison with my Xperia Z. I didn't let it run empty yet because of updates. I will discharge it completely now so that it can calibrate or whatever. After that i will charge it to 100% and report how long it lasts until it powers off during normal usage. I deactivated the SIM2 slot in the settings. Bluetooth, GPS are mainly off. WLAN and mobile data (set to 3G) are enabled. I also recognized a clicking sound but I think it has to do with the (de)activation of the audio device. It stays on after playing some notification sound and I can hear some noise and sometimes the radio interference of itself until it shuts off the audio device with a clicking sound. I'm not sure if this is very good for the speaker.