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I would use my phone a lot (music, hotspot, not phone calls) and only get 15 - 18 hours from a fully charged battery.
I had read that some people got between 1 day and 1.5 days.
So, what is the upper limit? If you leave you phone in one spot and hardly touch it, how long will it run for?
The specs say 250/290 hours for 3G/2G.
To get this I assume you would need great signal levels, and virtually nothing running on the phone - in fact the phone would be the factory default.
But what could I get? I don't get great coverage at my place, especially inside where the signal is shielded by metal fly-screens, foil insulation, steel roof and two layers of brick - it is almost a Faraday cage.
I defaulted the phone. I didn't clear my SD card because I didn't want to.
I did make a few changes: I kept some applications that I do use often, and I disabled Picasa sync because I am in the middle of uploading lots of photos and that would distort the tests.
The big power consumers are believed by some to be the display, radio, GPS, WiFi, Bluetooth, and sync.
I have found that the main ones are the display and the radio (2G/3G).
In Australia the carriers all have GSM as well as either UMTS or HSDPA. My carrier only seems to have GSM and UMTS.
I decided to test what radio setting uses less energy. My options are GSM Auto (PRL), WCDMA Preferred, WCDMA Only and WiFi (for when I am at home). I don't want GSM only so I am not going to test that. I won't test Automatic either because I have no idea what it actually does.
- GSM Auto (PRL) I believe prefers GSM rather than WCDMA, but it will switch to WCDMA if the signal is strong enough.
- WCDMA Preferred is the opposite.
- WCDMA Only is what it is.
When WiFi is on, I believe the 2G/3G radio switches off, so only the WiFi radio is on.
GPS will be left on (as per the default), as will sync, the default live wallpaper, widgets etc.
As I said earlier, Picasa sync will be off.