The following are conclusions from the testing I performed:
- If you have a weak cellular signal, your battery will drain significantly faster (go to airplane mode if you need to conserve your battery in these conditions)
- Wireless data transfer is more efficient than 3G data transfer. Use wireless connections when available.
- Bluetooth and GPS can always be on with minimal impact to your battery
- A properly configured phone should easily achieve 6 hours of talk time
- You can expect simple gaming and apps to consume approximately 20% of battery life per hour (more data should be and will be collected on this)
- Live Wallpapers have minimal impact on battery life
- Download apps and web browsing can and will burn battery in hurry. Perform these activities with discretion or while plugged-in.
- Task killers are not needed. I don't have one and I have excellent battery life without it. Those that see benefits from a task manager probably have a misconfigured or rogue app.
I have a few more tests I plan to run. As I get to them, I will post the results here. Specifically, I plan to test using a manual brightness setting of about 33% using the simple gaming test. I also plan to add Good for Enterprise. I suspect this was a major source of my battery woes to begin with. I now have a good baseline for comparison. Finally, I will download apps a few at a time and monitor my phone's battery for adverse effects. Rogue apps will be quickly put to pasture.
The techniques in this article have helped me restore my excitement about my EVO. I've gone from burning 15% of my battery in one hour without using it to 58% battery remaining after 18 hours of what I would consider moderate/low use.
I hope many of you will find this article useful. If you struggled as I did with battery life, these principles can help. Your excitement can be restored. You CAN stop worrying about your battery. You CAN once again enjoy your new Android phone.