Hello all, okay, and thanks for the approval. Here's my notes I made back in January regarding Optimus V power consumption.
I have an Optimus V now. I just made some current drain measurements during charging. The Optimus limits the current from an external power supply to no more than 400ma. About half an hour into the recharge current consumption dropped back to 350ma and stayed there for most of the cycle.
I found that if you turn the phone off, It will still draw the same current when charging. So if it is off, it will charge a little faster (compared to phone idling sipping juice) but not by much. Try not to use the phone so much while charging might be best if charging speed is important. And yeah using power from a USB/computer is not a good idea. Might wear out low tolerance parts in the machine.
Other power drain notes (Battery fully charged, and using external linear regulated power source). Current is measured at the input of the phones USB connector:
48mA- Phone
off (note the 4 buttons are lit)
31mA- Phone
on standby mode, screen off
69mA- At the 'home' screen
123mA- Screen rolling a page
75-85mA - Looking at the Settings> About Phone > Status screen (looking at signal strength change, etc.)
165mA- WiFi turned on and using it to download 1MB file. Once done drops back to 69mA
235mA- (WiFi off) Network data enabled (3G), downloading angry birds, 4 bars reception
235mA- Using the maps app to show me where I am at. drops to 113mA when network data is idle, map on display.
155-160mA Playing Angry Birds
140mA- Phone call with 4 bars reception
275mA- Phone call with speaker phone on, 4 bars reception
Some folks wanted to see the difference in current drain between 3G and 1xRTT, and the general belief that 1xRTT is a big battery saver compared to using 3G. And some claim WiFi may be a better way to go. Let's see what I found...
3G / 1xRTT / WiFi current drain comparison:
(speed test performed, signal strength -85dbm (weakish), non stock apps stopped, background data/sync off)
3G 250mA average Speed test complete in 9 seconds 284kbit/s
1xRTT 210mA average Speed test complete in 25 seconds 132kbit/s
WiFi 170mA average Speed test complete in blink of an eye. Router 25' and 1 wall away from phone.
Short answer: After a number of tests between the two, and a signal of -85dbm (not the best reception, but good for testing as the transmitter runs longer) the
average current drain is only
40mA greater when using 3G as opposed to 1xRTT.
* Note: Because the transmitter had to remain active longer in 1xRTT mode to complete the same test, the phone actually drew 0.85mA more over the length of the test than it did in 3G. So if phones are saving power in 1XRTT, there is another factor some where not supported here. You could say this was a lab test condition with lab tests results, but as we all know, things are always different in the real world right?
Another way to look at it...If the 3G was transmitting for an hour I figure it used about 4% more battery life over 1xRTT. (Again in a lab test, and calculator isn't real world heh heh)
Other tests I've done a few times now, show that to recharge a claimed dead battery, the phone drew right at 1000mA (phone off) total before charge was complete. But, how much of that 1000 went to circuitry, even though turned off at the time, and not to the battery? Well, best not ot pick it to death. I just wanted to point out that the battery says 1500mAH, but charges to 1000, it's normal, don't panic. This is where I usually talk about how if the the chip that manages the battery is well designed (and some are not), you generally don't have to worry about over charging, or running the battery down dead and causing shortened life, because the technology won't let you cycle the battery at full capacity anyway.
More tests...
Airplane mode ON / OFF- Some say the receiver is also turned off when airplane mode is enabled. I don't see a change in current drain in either state. Of course airplane mode
does inhibit the transmitter.
Charging time
I found that I really needed to update my findings on this matter. Previous data no longer valid. Charging tests have been updated, and this time it includes fast charge rates. Scroll down a few posts and I will explain
Hope this helps in realizing what the demands are that we put on the phone under typical conditions. I'm delightfully surprised.
K-L-M