- 07-10-2007, 11:03 PM #76
Dude, you're wrong. You can't go from voltage to mAH like that. It doesn't work like that. Lots of batteries are 3.7V and have mAH ranging all over the place, and you are just making up physics now.
Also, mikec, no friend of mine, did not slander you. People love to throw that term around, but there's no slandering going on here.
- 07-10-2007, 11:11 PM #77
Here's a 3.7V battery with 2500mAH (li-poly) (http://www.batteryspace.com/index.as...OD&ProdID=2613)
Here's a 3.7V battery with 3000mAH (http://www.radioshack.com/sm-lenmar-...i-2439467.html)
Here's a 3.7V battery with 4000mAH (http://cgi.ebay.com/3-7V-4000-mah-U-...QQcmdZViewItem)
Here's a 3.7V battery with 5000mAH (http://www.alibaba.com/catalog/10687...V_5000mAh.html)
If you want to learn how volts and mAH are really related, feel free to PM me.
And I still say, judging by the relative size, apparent current draw, and relative lifespan of the battery that it is most likely >4000mAH. The way apple got better life is, in large part, by using a more capacious battery.
- 07-10-2007, 11:12 PM #78
"Apple has exchanged them all?" ok, fine. i suppose that could mean (imply) that each and every defective phone (no matter of the defect) was successfully exchanged as opposed to accepting them back with an early restocking fee, or without.
is that the point you're trying to make or are you saying that each and every iPhone battery related instance has been dealt with, and exchanged with a new one?
can one infer such?
- 07-10-2007, 11:46 PM #79
As quoted: "Apple has exchanged them all and these reported occurances of batteries not performing as published are fading away."
I suppose a conspiracy theorist could assume this was allowed so that they could push more phones through the channels to have virtually/fake higher sales figures.
I don't know why I added that last part. I guess just to beat surur to it.
- 07-10-2007, 11:49 PM #80
- 07-11-2007, 08:17 AM #81
To quote cmaier, "it's not slander if it's true." And not, I am not slandering you, just repsonding to your posts.
First, you need to read what you wrote - you said Apple made battteries. (now if that what a mistake, just say so and move on).
Second, 300-400mah? You have ZERO idea what you are talking about. There is absolutely NO WAY that it's a 300-400mah battery. I will bet a free iPhone to everyone on this thread on that, and better yet, if I am wrong, I will never respond to one of your posts again.
Are you confusing charge cycles with mah?
It's common knowledge that in cell phones/smartphones, more mah means longer battery life (yes, voltage plays a factor, but mah is where the rubber meets the road.
- 07-11-2007, 08:47 AM #82
Hey, Archie, here's a little physics lesson for you. I'll ignore parasitic effects to keep it simple.
Voltage is a measure of potential (the easiest way to think about it is that a higher voltage between two points means a higher difference in charge between those points). Amps is a measure of current.
On a battery, ideally, the potential is constant. In this case, 3.7 volts. No matter what the phone is doing, that battery does its best to keep the potential across it's two terminals at 3.7 volts.
Now, the phone will require a different amount of current depending on what it is doing. If the screen is on, that requires a certain amount of current. Each time the CPU clock transitions, it requires a certain amount of current. Each time a logic gate on the CPU changes state, it requires a certain amount of current. A certain amount of current is used at all times due to transistor leakage. When one of the radios is on, it requires current. Current is just a measure of how much charge is moving. (It's the rate of change of charge).
So the current varies depending on what the phone is doing.
Now, a mAH is essentially a measure of how many hours the battery can supply 1/1000 of an Amp before it dies. In other words, if you have a 1000mAH battery, it can supply 1 Amp for 1 hour before it dies. If asked to produce a half amp, it could do so for 2 hours. In other words, the battery life will be determined based on how much current the phone gets from the battery.
Essentially voltage has nothing to do with it. (this is an oversimplification, in that batteries are not "ideal" and voltage will vary as the battery depletes, etc.)
One place people get confused is that microprocessors can have their voltage adjusted to tradeoff speed vs. battery life. The way this works is that if the voltage supplied to the microprocessor is reduced, the current demanded by the microprocessor will also be reduced. Think of it like a flashlight - if you use a smaller battery the light is dimmer. This is because transistors and on-chip wires don't require as much charge to change their state when the voltage is reduced.
- 07-11-2007, 09:41 AM #83
- 07-11-2007, 09:47 AM #84
Regardless of who makes what, Archie's premise is incorrect. There is no evidence that it is "one quarter the size of the smallest Treo battery," and, in fact, the evidence is that it is at least as large (both physically and in terms of capacity) as a Treo battery.
- 07-11-2007, 09:48 AM #85
That's one big slab of battery, significantly bigger than the 1500 mAh battery in my Nokia E61. I'd guess at at least 2500 mAh.
- 07-11-2007, 09:49 AM #86
- 07-11-2007, 09:55 AM #87
- 07-11-2007, 09:58 AM #88
- 07-11-2007, 10:50 AM #89
- 07-11-2007, 10:54 AM #90
- 07-11-2007, 10:56 AM #91
- 07-11-2007, 11:02 AM #92
- 07-11-2007, 11:19 AM #93
- 07-11-2007, 11:23 AM #94
- 07-11-2007, 11:28 AM #95
The radios could also be operating at completely different power levels.
Also, you have to look at other functions. The processor is running at 600MHz or so. I think my old treo 650 (with it's 3200mAH extended battery, giving me around the same useful operating time in my brief experience as the iphone) has a processor running around half that.
Power consumption for a processor will be roughly proportional to the frequency times the square of the voltage. (Note the processor is likely receiving around 1.5 volts, not 3.7). Assuming nearly identical processor design and functionality, therefore, the iphone processor should draw about double the power of the arm processor in my treo 650. (Again, as a processor designer I don't underestimate the ability of good design to affect all this - we had lots of tricks at AMD, but if you're going to do "back of the envelope" calculations, you need to base them on something other than voodoo.)
- 07-11-2007, 11:39 AM #96
- 07-11-2007, 11:41 AM #97
I now apologize you to for sparring over the battery cycle thing (and the needling comments directed your way as part of that thread). I could blame it on a.) ADD, b.) not being on my meds, or c.) society, but I'm not Paris Hilton, so I'll just buck up and say mea culpa.
- 07-11-2007, 11:42 AM #98
- 07-11-2007, 11:53 AM #99
- 07-11-2007, 12:34 PM #100