[thierryb]

Bahery life is our main issue with bluetooth. I have spend time to do a lot of test and measures. I will give them to all of us.

Flame Power Management

Flight mode
No backlight, Automatic Power: 155 mA
Backlight 1, Auto Power: 200 mA
Backlight 1, PowerSaving: 200 mA
Backlight 1, Power Performance: 248 mA
Backlight 0, Power Performance: 200 mA
Backlight 2, Auto Power: 220 mA
Backlight 3, Auto Power: 237 mA
Backlight 4,AutoPower: 257 mA
Backlight 5,Autopower: 279 mA
Backlight 6, Autopower: 297 mA
Backlight 7, Autopower : 312 mA
Backlight 8, Auto power: 330 mA
Backlight 9. Auto Power: 350 mA
Backlight 10, Auto Power: 359 mA
Backlight 10, Power Performance: 402 mA
Backlight 5, Power Performance: 319 mA

Backlight 1, Power Saving
Flight Mode: 200 mA
3G : 205 mA
2,5G: 204 mA
Bluetooth: 238 mA
Wifi(b), Always Enable, Best Batt.: 214 mA
Wifi(c), Always Enable, Best Perf.: 242 mA
Wifi(d), Always Disable: 422 mA
Wifi(a), Auto Enable, Best Perf : 232mA
Wifi(e), Auto enable, Best Batt.: 212 mA
3G + bluetooth: 237 mA
3G+ bluetooth + Wifi(a): 243 mA

Backlight 1, Power Saving
3G+ bluetooth + Wifi
Speed in kbit per sec with ie
(a) 290 mA 86 196 53 37 38
(b) 284 mA 60 42 36 39 51
(c) 328 mA 274 106 152 152 152
(d) 574 mA 913 710 913 581 462
(e) 308 mA 36 91 65 47 57

Backlight 1, Power Saving
3G+ bluetooth + Wifi
Speed in kbit per sec with netfront 3.3
(a) 440 mA 240 447 246 452 193
(c) 430 mA 643 378 258 142 316
(b) 411 mA 38 247 211 88 178
(d) 632 mA 809 790 1031 1367 1361
(e) 445 mA 211 210 287 154 58

Backlight 1, Power Saving
?G+ bluetooth + data
Speed in kbit per sec with ie
3G: 600 mA 114 91 106 91 98
2.5g: 450 mA 27 21 22 31 57

Backlight 1, Power Saving
?G+ bluetooth + phone
3G: 211 mA > 510 mA
2.5g: 211 mA > 400 mA

So you understand that it is behitto have low backlight bit backlight is not the main issue.

Have phone on, in 2.5g or 3g, is not a problem. It takes few power. But make a call, and you drain you battery twice fast as doing nothing. Roughly 200mA when you wait a call, 200 mA more if you have a call in 2.5 g, and 100 mA more ifi the call is in 3g.

And if if is not a call but a data transfer, add 50mA in 2,5g over a call, and too more if it is in 3g.

So data in 3g burn your battery 3times more rapidity than waiting a call.

And what are the speed for data? in 2,5g we have roughly 32 kbit per sec, and in 3g we reach roughly 100 kbit per sec. So you say 3 times more rapid and only 100 mA more, it could be interesting to be in 3g for surfing. that's true only if you do a lot of download, but if you browse pages that is not the case because it takes time (10-20 sec) after the end of the page download before the level go back to 200 mA.

But for speaking you have right, it is better to be in 2.5g.

Before speaking wifi, I will speak about browsers. I discover that ie use less power than nettront 3.3, but for the same configuration netfront is more rapid. Netfront cost you an average of 115 mA, but the speed is multiplied by from 1.5 to 3. What conclusion ? I do not know, except that use ie if you have a low level I battery, and just want to access small pages like wap ones or pda adapted.

Bluetooth was also a surprise for me. It cost roughly the same than 2 levels of blaclclight or from no baddight to first level : 40 mA. So turn off you bluetooth if you do not need it. For instance it is also equivalent to using calligrapher to vvrite text (I will do more battery usage tests about softwares)

And the end : wifi configuration.
Do not put your configuration to Power Saving Always Disable, except if you need highspeed and have your charger not to far, and even plug it. Even if you do nothing, it wil be equivalent to an 2,5g call, 200 mA more than the base level of 200 mA.
The always enable coafigs will cost you a little bit more than the auto enable ones. Less than 10 mA in standby, and less than 30 mA in work.
These differences are equivalent between best perf or best battery, 10 mA in stdby and 30 mA in work.
The biggest difference is between "Auto enable best battery" and "always enable best perf" and it will cost you 30 mA in stdby and 40 mA in work. Less than bluetooth !
But in term of speed they are really different: 3.6 times more rapid
(I have not tested b or g, I was in g if sktools is right)
Conclusion: stay always in "always enable best perf" except if you have your charger.

And if we compare wifi and data? use wifi, it will cost you 200 mA less , and you will have a 1.6 increase of speed.

That's all folks !