1.  10/09/2009, 01:25 PM Can't be the LED light by itself - perhaps the associated monitoring circuits. LED on for 1 second: 3.5 VDC x 10mA = .035 W , or .035 J/s. One second uses .035 Joules. Battery of Pre: 1150mA-hr, 3.7VDC. 3.7V x 1.15A x 3600 sec = 15,318 J of energy 1 LED flash: 0.0002285 % of battery capacity In 12 hours, 6 hours of LED being on (50% duty cycle) uses ~ 5% of battery capacity.
2.  10/09/2009, 07:25 PM Originally Posted by jp99 Can't be the LED light by itself - perhaps the associated monitoring circuits. LED on for 1 second: 3.5 VDC x 10mA = .035 W , or .035 J/s. One second uses .035 Joules. Battery of Pre: 1150mA-hr, 3.7VDC. 3.7V x 1.15A x 3600 sec = 15,318 J of energy 1 LED flash: 0.0002285 % of battery capacity In 12 hours, 6 hours of LED being on (50% duty cycle) uses ~ 5% of battery capacity. Its more complicated than just the LED. There has to be a circuit controlling the blink, and I suspect they're doing that in software from the OMAP3. That means, in its current state, the OMAP3 is probably running at full-power to blink the LED and never going into a low-power or standby state. Originally Posted by Brain_ReCall I'm an Embedded Software Engineer. My idea of a Good User Interface is printf().
3.  10/10/2009, 08:38 PM Originally Posted by Brain_ReCall Its more complicated than just the LED. Uhmmm ... yes, if you read the first line of my post, it states that. The math is just the proof it can't be the LED by itself.
4.  10/10/2009, 11:55 PM Originally Posted by jp99 Uhmmm ... yes, if you read the first line of my post, it states that. The math is just the proof it can't be the LED by itself. DER. I GO COLLEGE! ME READ! Sorry about that. Originally Posted by Brain_ReCall I'm an Embedded Software Engineer. My idea of a Good User Interface is printf().
5.  10/11/2009, 06:05 PM I did run a test last night (overnight) with interesting results. I put the Pre in airplane mode, and at midnight the new tasks caused the notification light to come on. I also ran the battery monitor to log the power drain, set to record every 30 minutes so as not to consume much power. The Pre used 1/2% per hour while the notification light was blinking (or 1% every two hours). So it doesn't use much more than the LED consumes, at least in my case (calculation was 5% over 12 hrs, and this would be 6%). No other cards were open - I shut everything else down to just test the light. So if it's causing a power drain on a Pre, I'm not sure why - or what might be set up on another phone to cause this.
6.  10/11/2009, 09:18 PM After installing a bunch of tweaks I also had a noticibale change in battery life. it was drainingmuch faster. I don't know which one is responsible but I thought LED notification may have been partly to blame.
7.  10/11/2009, 11:22 PM Same here. After purchasing the Pre a couple of weeks ago, it took a lot of effort to get to acceptable battery life. Thanks to all the tips on this forum I was able to get there. Just did landscape email, virtual keyboard, & LED notification tweaks and the last two days my drain rate has been 7-12% with minimal usage...not good. I was running locations services on with no issues prior to the tweaks. Even after shutting location services off today, I'm still averaging well over 10% per hr. Disabled virtual keyboard yesterday because it wasn't working quite right and this did not resolve the issue. Going to try LED disable tonight.
8.  10/11/2009, 11:37 PM I've had the same battery drain problem after installing the latest round of tweaks and I don't think it's the blinking LED as I've had this for a while. Ironically, I believe it might be the battery % tweak that's the culprit (or possibly the date/time). I can't see why the date/time would matter, but the battery % seems like too much of a coincidence...I'm wondering if the code for this is actually querying the battery more frequently to determine status (or something...obviously I'm not an electrical engineer). I will try disablng the battery % tweak first, will report back.
9.  10/12/2009, 01:25 AM I had a notification and the LED must have been lit up for about 5 minutes in my pocket. It drained 10% battery life. I turned it off. Haven't noticed problems with any other tweaks using an unusual amount of battery life though.
10.  10/12/2009, 01:25 AM I had a notification and the LED must have been lit up for about 5 minutes in my pocket. It drained 10% battery life. I turned it off. Haven't noticed problems with any other tweaks using an unusual amount of battery life though.
11.  10/12/2009, 01:43 AM I've been experiencing this as well. Just wondering, how many of us that are complaining about battery drain have installed the "battery as %" patch?
12.  10/12/2009, 01:46 AM I've installed about 20 or so tweaks, including the LED patch, and I haven't seen much of a difference in battery life.
13.  10/12/2009, 05:36 PM I have the battery as % patch, as well. Just removed it, so we'll see if that helps. Disabled the LED notification yesterday and still have 11-12% drain. I've also had my Pre power down three times since Saturday for no reason...
14.  10/12/2009, 08:12 PM The reason why i was asking is that i'm thinking the "battery as %" patch is more psychological than an issue with the phone. I think now because everyone sees their battery draining in 1% increments, it's giving the impression that the battery is draining faster, when in fact it's probably draining at the same rate it always has. Last edited by myculito; 10/12/2009 at 10:19 PM.
15.  10/12/2009, 09:33 PM Definetly not simply a perception issue. I don't have enough data to suggest that this is the solution, but removing the "battery as %" patch seems to have helped significantly. I'm back to 2-3% drain with comparable usage this evening.
16.  10/12/2009, 09:35 PM More info...battery temp has been running at 24C all evening tonight. Was at 32C most of the weekend with the tweaks running.