... Attached is a screenshot I took this morning, when 20 minutes ate up 17% of my battery. I was dreading a dead battery by the afternoon, but somehow the remaining 3.5 hours of the same exact tasks chewed up only 28%. Anyone have any reasonable explanation for this?? Maybe it was a faulty indicator after all? But how could it change midway through the day..
\\edit: now that I look at the pic, I'm noticing that it doesn't indicate rate of consumption. it was definitely on for 21 minutes, and the battery was at 99% (it can never get to '100%') when I unplugged it this morning. maybe it's my charger, in combination with some faulty software in the tablet...
Not long enough to really tell much. I would do without the games as the processor and graphics demand of games will skew your measurements.
Worth the money: Battery Monitor Widget Pro. Turn on Monitoring without widget. Set history update rate about 5 minutes or so. What it will tell you ... the usage mA screen will indicate the RATE at which the battery is being dragged down, and when. It won't tell you what apps, for that you need...
SystemPanel Pro. Registered version has neat features, worth buying. It will show you how much CPU apps were using, when, and also how much CPU a particular app was using, and when. Unfortunately, you can't slide the history around like in BMW. But if the period you are examining is within the last 8 hours, it's helpful enough. Do NOT use System Panel to kill apps. Their docs say as much; just use it for analytics.
Both apps helped me immensely when identifying power outages on my Amaze, and also drains on the battery. Using the two, you can get a much better picture than Android usage shows you, as to what app is using more power than others. For example, after a full charge, play 30 minutes of a really processor-intensive game like Osmos (there's a free preview) or Dark Meadow. Your hand will tell you too, the lower back (opposite the audio plug gets quite warm.
Then stop the game for 10 minutes, and look at BMW and SystemPanel. You should see the % the game has been using, and see the spike in power consumption.
Tip: setting markers in BMW allows you put start and stop times in the history graph when you're doing something you think is a power hog.
Hope this helps.