EV-DO uses much less power than Wifi in my general use. I got about 3.5 hours streaming over EV-DO that drained my battery from 100% to 20% when I was up in Seattle. That was with the screen toggled in WMP and with full signal strength.
YMMV depending on signal strength (Wifi vs EV-DO) as they both require more power when your strength isn't as strong (proof in point - EVDO was just turned on in my area and I average three bars - I get about 2 days of battery life w/ Activesync checking mail every 15 minutes. Before, I had 1 bar 1X and was lucky to make it 12 hours).
Does anyone know if Wifi or Evdo sucks more juice?
Hi
Now that I got my wifi working (it didn't work before cause I had G only enabled on router) I was wondering if it is best to leave EVDO on or use Wifi.
I have unlimited EVDO plan so it doesn't cost me extra to leave it on all the time. And the speed seems to be about same.
I was just wondering which one is better in sucking less juice out of the battery.
Also anyone know of any good free chat programs like aim and yahoo? I tried going to mobile.aol.com but i couldn't find the download link- i seemed to be clicking around in circles.
If i have the choice of both, i'm wondering which uses less power. EVDO speed is fast enough for me, so i don't care about using the WiFi unless is uses less battery.
I would venture to say wifi but I EVDO can be pretty bad if you have a week signal. I saw EVDO eat my phones battery in about 1 hour with I had a week signal.
I have no scientific evidence, but from experience it seems that WI-FI uses more power. I wonder about bluetooth, too? I have gotten into the habit of leaving the phone power on all the time, and only turning on WI-FI and Bluetooth when I am actively using them. I have WI-FI set to turn itself off if there is no signal for 2 minutes.
Related question:
How does the device choose between EVDO and WI-FI? I have an e-mail account set to download messages every 30 minutes. Frequently, at home, with WI-FI tunrned on and a 4-bar signal, but a lousy EVDO signal, I "catch" the 6700 trying to connect using EVDO to get the mail (The error message shows it dialing #777 and reports "there is no modem at the above number".) Both the e-mail account and the WI-FI connection point to "Internet".
EV-DO (and 1X data for that matter) drops in dormant mode as soon as an active data transfer is done. Thus, both modes should use less than a voice call.
I noticed traveling outside an EVDO area just killed my batter. I am not sure if it is using power to look for the EVDO or 1X uses a ton more.
Wifi all day at home reduced batter about an hour sooner the whole day.
This doesn't make any sense. Voice call and EVDO use the same radio, they would comsume power at a very similar rate.
This makes a lot of sense, though it partially depends on which way the EVDO data is streaming. The issue here is that while both nominally use the same transmitter, the wireless protocols are very different, as is the duty cycle.
First of all, there is the simple fact that a voice call is transmitting on a much higher duty cycle than an EVDO session where data is mostly streaming to the phone. In a voice call, your phone is transmitting any time you talk and any time ambient noise rises above pickup threshold. Downlink and uplink bandwidth are essentially equal with this protocol.
An EVDO data session where data is mostly streaming to the phone needs only transmit when packet acknowledgements are needed, or when the upper level protocol (whatever streaming mechanism you-re using) needs it. EVDO is also an asynchronous protocol, where the majority of the bandwidth (and thus transmit power) is allocated to downlink.
This makes a lot of sense, though it partially depends on which way the EVDO data is streaming. The issue here is that while both nominally use the same transmitter, the wireless protocols are very different, as is the duty cycle.
First of all, there is the simple fact that a voice call is transmitting on a much higher duty cycle than an EVDO session where data is mostly streaming to the phone. In a voice call, your phone is transmitting any time you talk and any time ambient noise rises above pickup threshold. Downlink and uplink bandwidth are essentially equal with this protocol.
An EVDO data session where data is mostly streaming to the phone needs only transmit when packet acknowledgements are needed, or when the upper level protocol (whatever streaming mechanism you-re using) needs it. EVDO is also an asynchronous protocol, where the majority of the bandwidth (and thus transmit power) is allocated to downlink.
My thoughts exactly. I should also add that on a voice call you are also using the speaker. If during this time your screen is still backlit, it is actually gonna draw more power.
Login
Panel
