I'm the usual new device (Nexus 7) buyer who charged off in all directions simultaneously, provisioning my tablet with apps and customizing practically everything.
During that process I found that my battery life became totally unacceptable. Just sitting overnight the device lost about 30% of its charge. My main purpose for the device is flying, where the flight planning app eats about 10-15%/hour, so this huge battery drain effectively meant that I had to fully charge the tablet on the day of a flight. A time consuming hassle. (or plug it in and drape a cable in the cockpit, another hassle)
Here is the short version of what I learned: Innocent-looking apps can cause big problems. One, called "Animated Analog Clock" caused the CPU to run more or less continually at 340MHZ and to never sleep. Another, Yelp. checked in with the mother ship every 40 minutes all night long, again keeping the CPU awake. Finally, Google's spying-by-default caused Google Maps to report my tablet's location regularly to the detriment of battery life.
Having dealt with those problems, last night my tablet went the whole night in "Deep Sleep" and used a whopping 2% of the battery.
So, the moral of the story is that to solve a battery discharge problem, you have to trouble-shoot your apps very carefully. As I said, this is the short version. I'm posting it here because I benefited from these forums while I was figuring out this problem and I'd like to pay back. If several of you are interested in the gory detail of what I did and what tools I used -- a much longer post -- just let me know via this thread and I'll put in the effort to write it up.
During that process I found that my battery life became totally unacceptable. Just sitting overnight the device lost about 30% of its charge. My main purpose for the device is flying, where the flight planning app eats about 10-15%/hour, so this huge battery drain effectively meant that I had to fully charge the tablet on the day of a flight. A time consuming hassle. (or plug it in and drape a cable in the cockpit, another hassle)
Here is the short version of what I learned: Innocent-looking apps can cause big problems. One, called "Animated Analog Clock" caused the CPU to run more or less continually at 340MHZ and to never sleep. Another, Yelp. checked in with the mother ship every 40 minutes all night long, again keeping the CPU awake. Finally, Google's spying-by-default caused Google Maps to report my tablet's location regularly to the detriment of battery life.
Having dealt with those problems, last night my tablet went the whole night in "Deep Sleep" and used a whopping 2% of the battery.
So, the moral of the story is that to solve a battery discharge problem, you have to trouble-shoot your apps very carefully. As I said, this is the short version. I'm posting it here because I benefited from these forums while I was figuring out this problem and I'd like to pay back. If several of you are interested in the gory detail of what I did and what tools I used -- a much longer post -- just let me know via this thread and I'll put in the effort to write it up.
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