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Charge Time on New iPad Significantly Increased with Larger Battery

One interesting note on the new iPad revealed in TechCrunch's review is the observation that charging time has increased significantly over previous models. While the increase is not necessarily a surprise given the significant 70% boost in battery capacity from 25 watt-hours in the iPad 2 to 42.5 watt-hours in the new iPad, it is an issue that many users may not have considered.
It appears that they’ve had a fairly major breakthrough in their battery technology. While the new battery clearly isn’t much bigger than the old one, it can hold much more juice (42 watt-hours versus 25-watt-hours). The downside of this is that I’ve found it takes quite a bit longer to charge the new iPad. As in several hours — you’ll probably want to do it overnight.

Logic board and battery of new iPad (Source: iFixit teardown)

The increased battery capacity is undoubtedly being used to power such enhanced components as the Retina display and LTE networking technology, while also maintaining the same battery life (10 hours on Wi-Fi, 9 hours on cellular data) of the previous iPad.

TechCrunch also notes that the increased power of the new iPad also seems to manifest itself in the device becoming "noticeably warm" in the lower left corner, something that had not been observed to such a degree in earlier models.

Related roundup: iPad Air

Top Rated Comments

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Posted: 31 months ago
That's quite understandable and IMO a small trade-off compared to what we're getting in return. I'll just charge it overnight :)
Rating: 6 Votes
Posted: 31 months ago
For all the advancements we make in technology, it seems that battery tech is always lagging behind. There are constantly new articles about amazing new battery tech being developed at XYZ Super University and it never happens.

Sure it's cool that they pumped this much juice into a battery not much physically larger than the old one—but I read about 7 years ago about how we would have laptop batteries that lasted for a month and took 15 minutes to charge that were being developed at MIT or someplace like that. I understand that they were probably being optimistic, but we're not even a little bit close to that today. What gives scientists? Oh—some law of nature? Well then, in that case you can stop getting my hopes up. Oh—you were bending the truth to secure additional funding? You sneaky scientists.
Rating: 5 Votes
Posted: 31 months ago
Seems like the iPad is going to have to move to using MagSafe for charging, and ship with the same power supply as the Air. Of course, they could still let you charge over USB if you needed to.

It seems inevitable given that the new iPad battery is larger than the one in the 11" Air (40W/hr vs 35W/hr)
Rating: 5 Votes
Posted: 31 months ago

In a year, they increased batt. capacity in same volume 70%? That's very significant advancement.

Link this 7 year old article you reminisce over.

----------

~ +70%


Ok, so I was slightly off—it's only 6 years old. In addition it wasn't 15 minute charging, it was only a few seconds: http://www.sciencentral.com/articles/view.php3?article_id=218392803

It seems it has more to do with nano technology lagging behind and not taking off as rapidly as we had hoped it would. Economies of scale are not kicking in for this tech quite yet.

Here is another one about 10 minute car battery charging (also from MIT): http://www.engadget.com/2006/02/17/mit-researchers-invent-new-hybrid-car-battery/

You can literally go on for days reading about all these batteries that haven't panned out. Everything from those nano tubes, to new metals, to fuel cells, to using viruses and other biological materials to create crazy new batteries that just about power themselves. But you hardly see them hitting the market.



The last line of your first paragraph contradicts the first line of your last paragraph. Why the rant? Why calling "scientists" names? "MIT or someplace like that"? With all due respect I find this quite bland and juvenile.

Advance in science doesn't mean it could immediately and effortlessly be implemented in (consumer) technology, simultaneously meeting economic and environmental requirements.

When it does, the product is something like 170% charge holding capacity in a battery of the same dimensions as the yesteryears. It's here today and frankly, I find it fascinating. But since you hardly appreciate it, I don't think any amount of advancement in technology at any given point of time will ever satisfy you. The day your '1 month long / 15 minutes charging' battery finally comes, I'm certain I'll find you blaming scientists for not having invented 'a year long battery with 10 minutes charging'.


Juvenile would be picking fights with someone on the internet. You seem to know so much about me, such as what would satisfy my apparent bloodlust for the battery industry. I was simply making an observation. My original comment was light-hearted and good-natured. I never called scientists any names. Near the end I was joking about how they are often at odds when trying to receive funding. Sir or Madam, I suggest you take everyday conversations on the internet a little less serious.

Yes, "MIT or someplace like that"—that's exactly where it was. In reality MIT seems quite involved with new battery science and research. It's quite fine if you think MIT is bland, but I was not picking a name out of thin air that I've heard of before to try to sound smart on the internet. See the above links and read them. It's ridiculous that I have to go find an article from 6 years ago to prove a point. Lighten up—and think next time before posting. It might keep you from being embarrassed again :)

This is the primary reason I don't post on here as much any more. So many new members have joined since the iPad became popular. Many of them are an insult to basic human intellect.
Rating: 4 Votes
Posted: 31 months ago

For all the advancements we make in technology, it seems that battery tech is always lagging behind. There are constantly new articles about amazing new battery tech being developed at XYZ Super University and it never happens.

Sure it's cool that they pumped this much juice into a battery not much physically larger than the old one—but I read about 7 years ago about how we would have laptop batteries that lasted for a month and took 15 minutes to charge that were being developed at MIT or someplace like that. I understand that they were probably being optimistic, but we're not even a little bit close to that today. What gives scientists? Oh—some law of nature? Well then, in that case you can stop getting my hopes up. Oh—you were bending the truth to secure additional funding? You sneaky scientists.


The last line of your first paragraph contradicts the first line of your last paragraph. Why the rant? Why calling "scientists" names? "MIT or someplace like that"? With all due respect I find this quite bland and juvenile.

Advance in science doesn't mean it could immediately and effortlessly be implemented in (consumer) technology, simultaneously meeting economic and environmental requirements.

When it does, the product is something like 170% charge holding capacity in a battery of the same dimensions as the yesteryears. It's here today and frankly, I find it fascinating. But since you hardly appreciate it, I don't think any amount of advancement in technology at any given point of time will ever satisfy you. The day your '1 month long / 15 minutes charging' battery finally comes, I'm certain I'll find you blaming scientists for not having invented 'a year long battery with 10 minutes charging'.
Rating: 4 Votes
Posted: 31 months ago
This is actually a legitimate issue. I've always considered the iPad to be fairly slow at charging. Adding several hours on top of that is not good for people on the go—but it's not the end of the world either. I usually charge my iPad overnight anyway—but when I forget to, even if I realize a couple hours before class, I would be out of luck now? Good thing I graduate in May. Office charging!
Rating: 4 Votes
Posted: 31 months ago
Considering it has the retina display and the boost in graphics, i don't mind charging it longer. :)
Rating: 4 Votes
Posted: 31 months ago

TechCrunch also notes that the increased power of the new iPad also seems to manifest itself in the device becoming "noticeably warm" in the lower left corner, something that had not been observed to such a degree in earlier models.

I believe I read in one of the other reviews that this heating in the lower left corner was related to LTE use...

No surprise that a "larger" battery takes longer to charge.
Rating: 3 Votes
Posted: 31 months ago

For all the advancements we make in technology, it seems that battery tech is always lagging behind. There are constantly new articles about amazing new battery tech being developed at XYZ Super University and it never happens.


Yup. Creating new and ever increasingly super powerful mobile gizmos each year is becoming a wall that the tech world is going to hit sooner rather than later.

It's as if all the auto world just ignored the price and availability of oil and continued to build bigger and bigger engines just so they could go faster, with no regard to how much fuel they use.

There just isn't enough interest or investment in portable power. Batteries are just not as sexy as flashy graphics or shiny materials and that's going to be the anchor that holds the world back.

I've said it before. Apple needs to spend it's money acquiring cutting-edge battery research. If they could push development forward in a huge leap that would benefit everyone. Not just Apple products.

An iPad that charges once a week and has a run time of 48 hours? That would be something.
Rating: 3 Votes
Posted: 31 months ago
Well I guess we know now that the only way to get a high res retina like display in a macbook pro is to ditch the superdrive so it can be replaced by more battery and that there is no way they could do it in the air. Guess we can apples 2012 roadmap
Rating: 3 Votes

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