More iPad Battery Notes: 25-Hour Hotspot Life, 2-Amp Current Draw from Discharged State

[SvP]

Are you sure about your lightning vs iphone explosion statements?
If so, it would be nice to see the facts.

Here's one from recently as last week.
A quick search will turn up hundreds of iphones melting, smoking & exploding.

Time will tell if the iphone battery issue has migrated over to the new iPad.



Image


http://www.ubergizmo.com/2012/03/iphone-4-bursts-into-smoke/

183,078,100 iPhones sold to date. let's say a 100 phones a year(!) explode (that would be 500 iPhones since the first one);
Chance of having an iPhone explode: 1/1,830,781
Chance of being struck by lightning: 1/775,000 (every year, in a lifetime it's 1/10,000)

So, yeah, i sleep well at night with two iPhones and an iPad charging in my house ;-)

sources:
http://en.wikipedia.org/wiki/File:IPhone_sales_per_quarter_simple.svg
http://www.lightningsafety.noaa.gov/medical.htm

 

[Mess]

I feel i have to echo most of the previous comments here.

This really is a non issue.

You will get approx 10 hours of usage out of an ipad, which will take you to the end of your day with ease! Then you will take your ipad and plug it into your wall with the nice sleek plug that Apple PROVIDED FOR YOU!!!

I have to say if this is really goning to be an issue for "business use" i would seriously recommend going back to the ipad2! Stick that up your USB!

 

[PracticalMac]

USB was NEVER designed for what it is doing today.

Yes, it can do it, more or less, but should it? No.

FireWire could do it, 1Amp, 12V (IIRC), would not break a sweat, and transfer speeds almost 4x faster.

Oh well.

You're in the minority. The display alone puts it *WAY, WAY* ahead of the previous two generations. It's the one to have.

Without a doubt way way WAY ahead of Android Tab.
iPad 2 still s solid capable machine, and still WAY WAY ahead of A-Tab's!

 

[kiljoy616]

All this is growing pain, this problem will be fix in the iPad 3. Yes I call it the iPad 3 and this one the iPad 2S. I am not going to play Apple PR naming scheme for now.

Once they move over to the A6 22nm die a lot of these issue will go away.

 

[firestarter]

That "smart signal" stuff is part of the USB spec, and has been from the beginning (100mA from an un-powered hub, for example). The "resistor network" is just a clever way of letting a "dumb" device tell the host how much power it wants. If the host doesn't like the resistance "message", it can refuse to power the port.

The analogue resistor ladder approach isn't part of the USB spec... and no, you have it the wrong way 'round. The power supply has the resistor network, and the iDevice senses how much power can be supplied, then only draws that much.

Check out the bottom of this page: http://www.ladyada.net/make/mintyboost/icharge.html

 

[kiljoy616]

I think the new iPad sucks.

Wrong place to say that!

I went yesterday to see one, and liked it but I can't justify getting one vs the iPad 2.

Rear camera who cares used min a few times not a must have.
Video conferencing same camera.
More memory never thought I was missing any on the iPad 2.
Faster CPU/GPU good but will wait for A6.
Retina is the only thing I liked but I did not like how less of an angle it.
Has for viewing. Please Apple fix this.

Heavier, not by much so not a big deal.
Bigger battery not always a good thing.

I will let the fan's and those who really need one be the test subjects.

 

[firestarter]

All this is growing pain, this problem will be fix in the iPad 3. Yes I call it the iPad 3 and this one the iPad 2S. I am not going to play Apple PR naming scheme for now.

Once they move over to the A6 22nm die a lot of these issue will go away.

You're wrong. The retina LCD panel transmits less light - therefore requires a stronger backlight. The increased power drain in the new iPad is due to this... not the CPU. Moving to a smaller CPU topology isn't going to 'fix' this at all.

 

[kiljoy616]

That is absolutely ridiculous. Because a PC owner's USB port doesn't supply as much power as the included charger for the 3rd generation iPad, Apple is screwing over their PC owning customers?

EDIT:

It's not like Apple can just go back and change the USB port specs. Obviously the iPad needs this amount of power to run their device, and they're not making it require so much power just to be jerks. That comment make absolutely no sense to me.

Well said, lets just say it people the iPad 2 was the last iPad you can charge with a usb 3 port but is that really a bad thing or just trolling.

What people don't have wall outlets in their room?

----------

I feel i have to echo most of the previous comments here.

This really is a non issue.

You will get approx 10 hours of usage out of an ipad, which will take you to the end of your day with ease! Then you will take your ipad and plug it into your wall with the nice sleek plug that Apple PROVIDED FOR YOU!!!

I have to say if this is really goning to be an issue for "business use" i would seriously recommend going back to the ipad2! Stick that up your USB!

hahahahaha, nice!

 

[bawbac]

183,078,100 iPhones sold to date. let's say a 100 phones a year(!) explode (that would be 500 iPhones since the first one);
Chance of having an iPhone explode: 1/1,830,781
Chance of being struck by lightning: 1/775,000 (every year, in a lifetime it's 1/10,000)

So, yeah, i sleep well at night with two iPhones and an iPad charging in my house ;-)

sources:
http://en.wikipedia.org/wiki/File:IPhone_sales_per_quarter_simple.svg
http://www.lightningsafety.noaa.gov/medical.htm

100 a year? You can see lots more reports than 100 just for the last 3 months alone by doing a search.

Where are the numbers of factual statistics of iPhones burning up/exploding to compare against the lightning strikes?

Just trying to clear the facts to determine if what you are stating is speculation or opinion.

 

[JAT]

So basically you can charge a Prius to full before you can an iPad (3rd gen) halfway.

interesting...

A Prius is a gasoline car, not electric, so I don't see how that matters. It takes hardly any time at all to fill its gas tank.

But yes, you can charge a real electric car to full faster than any iPad. (but not at your house) The supercharger system that is being designed by Tesla uses a ridiculously high amperage (prob >100a) to charge over 60kWh in well under an hour for electric cars with a decent sized battery. But probably not too good for the battery, despite the capability.

Now, if Apple was to put in more capable charging system that could handle higher loads, the iPad could charge faster. It would also turn into a laptop or bigger to house the extra tech.

 

[kiljoy616]

You're wrong. The retina LCD panel transmits less light - therefore requires a stronger backlight. The increased power drain in the new iPad is due to this... not the CPU. Moving to a smaller CPU topology isn't going to 'fix' this at all.

I have read the specs that not what I was insinuating, my take was that the A6 CPU/GPU uses less power and give way more capacity and that is what I want and will be very happy for the next year with my iPad 2.

I do understand it needs more light and also why the angle is tighter for viewing.

I personally don't like that and like anything technology it will get better.
I can wait and so can a lot of iPad 2 users. Hype is a dangerous way to purchase equipment.


I put my money that Apple will deal with this, bring the iPad 3 (2013) down again if not new look and shrink the battery again a bit.

I am not saying people should not buy it, just that hardware will be sorted out to bring out what many really wanted. If you can't be without the new iPad 2S that fine get one but the reason to upgrade is just to slim for me.

 

[JAT]

No it isn't. A few milliamps across the heart might kill you. AA batteries are constant voltage sources and have very limited power output and thus will never be able to kill you. A car (or marine) battery COULD kill you if you manage to lower the resistance of your skin with water or sweat.

You are right that this isn't news though.

Well, you could eat the AA, and that might kill you.

 

[firestarter]

I have read the specs that not what I was insinuating, my take was that the A6 CPU/GPU uses less power and give way more capacity and that is what I want and will be very happy for the next year with my iPad 2.

Yes - and this is wrong. The screen takes the majority of the power in an iPad. It doesn't matter if you halve the power the CPU takes - the retina screen will still mean you're burning more power than in an iPad 2.

I do understand it needs more light and also why the angle is tighter for viewing.

I personally don't like that and like anything technology it will get better.
I can wait and so can a lot of iPad 2 users. Hype is a dangerous way to purchase equipment.

The screen may get more efficient, but I doubt that that technology will change much in a year. I upgraded from an iPad 1 to the new iPad, and the screen is awesome. The awesomeness is real... no hype.

I put my money that Apple will deal with this, bring the iPad 3 (2013) down again if not new look and shrink the battery again a bit.

Pity we're not in the same country. I'd take that bet.

I am not saying people should not buy it, just that hardware will be sorted out to bring out what many really wanted. If you can't be without the new iPad 2S that fine get one but the reason to upgrade is just to slim for me.

What did people really want? I've been waiting two years for the screen to be this good... up to this point the resolution has been too low. The new version is finally the machine the iPad should be.

 

[50548]

I am going to side with Aiden on this. Whenever we need a computer for data collection or device automation, there is NO Apple option. You need a PC and you need x86 and you need windows (of various eras).

Once you collect that data or set up that automation, the device to analyze or control it is a Mac, but, let's at least be honest, that's 10% of the installed base.

We need a headless Mac with Wintel and legacy ports. Just one. That would increase the installed base [to] a full 30% IMHO.

Just Rocketman

Edit: I have been beating this dead horse for years . . .

Steve would hate me for saying it and would in no way go along. That's why we have Tim to increase market share from 6% to 30% and know how to actually fulfill that. Scary-cool! (far better than insanely great and a $1000 stock price AFTER a 10:1 stock split . . .)

Rocketman, I didn't know you were one of the supporters of the fabled xMac. I previously stated that under SJ this would NEVER happen...

But if Cook is as soft as he was for dividends, you may actually have your dream come true - just like the Performas, Quadras and LCs of the late 90s...I remember that catastrophe pretty well, having owned a Quadra 605 myself...

----------

The same USB standard ports that most Apples have, by the way.

And, it seems that only one USB port on an Apple can run at high-power.

Recent Apples and PCs support the high-power USB standard on a subset of the available ports - what is the difference in "superiority"?

...and saying "Winblows" demeans your argument. Don't resort to insults that a junior high school student would use.

Care to check how many mainstream PCs nowadays offer high-powered USB ports compared to Macs?

As for "Winblows", you shouldn't worry...at least I stopped using "Windows is DEAD" a long time ago.

 

[SvP]

100 a year? You can see lots more reports than 100 just for the last 3 months alone by doing a search.

Where are the numbers of factual statistics of iPhones burning up/exploding to compare against the lightning strikes?

Just trying to clear the facts to determine if what you are stating is speculation or opinion.

You are making the statement about more than a hundred, so you give me the numbers.
PS: looking at the sales numbers 2012, even at a rate of 100 a month from now on my statement would stand…

(really, your fear is irrational)

 

[RemE]

Regarding burning phones, another point about lithiums, they don't like physical abuse, dent one and it can combust without warning. I have two daughters, they abuse phones like nobody's buisness. Out of the MILLIONs of cell phones out there I am not suprised at all that a very small percentage have catastrophic failures, no matter the brand. iPads generally don't get near the torture so we aren't seeing many (any?) reports of them burning. Laptops, there have been literally millions of lithium packs recalled due to contamination in their manufacture causing unexpected flames, but I believe QC these days is much better.

Regarding iPad3 charge rate. I have not seen a spec anywhere that tells me that it is internally limited to 2.1Amps on its charge rate. I do know that the supplied 10W charger from the iPad1/2 is limited to 2.1A and will give no more. I have the technology to test the iPad3's charging to see if I give it a more robust charger, would it internally regulate the max charge rate to 2.1A. But lack the will as it's pretty much fine using the stock setup, I'm seldom in a rush to recharge the pad.

 

[kiljoy616]

Yes - and this is wrong. The screen takes the majority of the power in an iPad. It doesn't matter if you halve the power the CPU takes - the retina screen will still mean you're burning more power than in an iPad 2.

What did people really want? I've been waiting two years for the screen to be this good... up to this point the resolution has been too low. The new version is finally the machine the iPad should be.

Again I have seen the new iPad 2S and yes nigher resolution, but not enough for everyone to switch. If your on an iPad 1 then I could see how much faster CPU/GPU plus the new screen would entice you to change. If your eyesight is bad then yes the iPad 2S is what you want.

What I want is the A6 which means again preference of the individual.
Really I am not enticed about the new screen, I don't consider the old screen blurry or hard to read.

For me with 20/20 for now its pretty eye candy when it comes to the iPad 2S (can't help my self) and will wait till Apple puts the whole package together next year. I am not a cultist so Apple is just another company that makes a product I want, if not I would go somewhere where they did and pay them.

That is what is so much fun about living now, that every year new stuff comes out new things are improved so who knows what will happen but for people to drop their iPad 2 for the new iPad 2S does seem to me cultish. But then that is what this forum is all about

Its all about the eyes of the beholder no two people will want the same thing. Mine is horsepower (GPU/CPU) your is eye candy (pixel). Neither is wrong or right just preference.

 

[OrangeSVTguy]

Awesome! 10 hours later and my new iPad is now up to 48% charged via USB

 

[kiljoy616]

Ipad heat

For those who have not read or seen the video check out this article about temperature with all types of tablets.

http://9to5mac.com/2012/03/26/wired-also-tests-heat-of-new-ipad-finds-it-middle-of-tablet-road/

http://www.wired.com/gadgetlab/2012/03/new-ipad-versus-5-tablet-competitors-which-runs-hottest/

iPad 2S doing just fine.

----------

Awesome! 10 hours later and my new iPad is now up to 48% charged via USB

Is that USB 1, 2, or the amazing 3?

 

[-SD-]

I don't think I've ever unplugged something from my Pro quite so quickly before!

I did think it seemed to be taking rather a long time to charge via USB, and was planning on moving it away from the computer anyway. It's now plugged in via the PSU and charging at a much better rate.

 

[AidenShaw]

The analogue resistor ladder approach isn't part of the USB spec... and no, you have it the wrong way 'round. The power supply has the resistor network, and the iDevice senses how much power can be supplied, then only draws that much.

Check out the bottom of this page: http://www.ladyada.net/make/mintyboost/icharge.html

Yes - thanks for the correction, I did have it backwards. And you're right that the resistors are a non-standard Apple hack.

More on the specs for power can be seen at http://en.wikipedia.org/wiki/USB#Power .

Note that intelligent devices (those that use the USB data lines), should negociate with the host over the data lines to establish the permitted power draw - and I assume that the Ipad is considered an intelligent device.

 

[Cubytus]

Add FireWire to the iPad. Yet another high-quality differentiator in favor of Apple's machines. Standard specs FW provides up to 45W. Laptop-based one should provide at least half of that.

What's the issue with including FireWire?

 

[Slix]

Add FireWire to the iPad. Yet another high-quality differentiator in favor of Apple's machines. Standard specs FW provides up to 45W. Laptop-based one should provide at least half of that.

What's the issue with including FireWire?

Why not Thunderbolt? It's much faster than FireWire, let alone USB.

 

[Elijahg]

I think you are going to the other extreme. It is an issue. I use my iPad for business most of the day. I could use my iPad2 all day and have 30% or more battery left. My iPad 3 will die in 4-5 hours MAX. Thats not so bad but the real problem is that I can't even keep up with charging it. It charges SOOOO SLOW that it is a battle to keep power. Then If I plug it in at 10pm and unplug it at 5:30 or 6am, its only charged to 97%. Needs another hour. The problem is that it takes longer to charge the battery than it does to drain it.

That IS a problem that Apple should find a way to deal with it. (faster charger?)

Try using the supplied Apple charger.

No it isn't. A few milliamps across the heart might kill you. AA batteries are constant voltage sources and have very limited power output and thus will never be able to kill you. A car (or marine) battery COULD kill you if you manage to lower the resistance of your skin with water or sweat.

You are right that this isn't news though.

Water isn't conductive enough to cause 12v to be any bother to a human. Besides, the electricity flows around your body via the skin, unless it's really high voltage/amperage. Tell you what, I've a 20v 5 amp bench power supply here, I'll hook it up between me and an ammeter, and see how many amps I get.... There, with wet fingers on different hands, I get 60µa, that's 0.00006 amps. Not a lot, and certainly not enough to cause any bother.

 

[AidenShaw]

You want a $1000 IPad?

Why not Thunderbolt? It's much faster than FireWire, let alone USB.

T-Bolt is too big, too expensive, too power-hungry - and the bottleneck is probably the flash memory, not the interface.

Unless you're hitting above 30 MB/sec (decimal), USB is not the issue.