

IPad Teardown - tomerico
http://www.ifixit.com/Teardown/iPad-Teardown/2183/1

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tomerico
The most interesting thing in my opinion was the fact that 80% of the space
was taken by two large batteries.

No wonder thae battery is irreplaceable.

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jrockway
Open the battery door of your phone and you'll see a similar phenomenon.
Except that you can replace the battery.

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axod
I'd really love to see some startups working on Battery technology. Batteries
don't seem to have improved at all in the last 30 years. They absolutely suck.
Surely someone out there can do better :/

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jrockway
Uh, you don't remember the NiCd and NiMH batteries from a decade ago? I do.
Those _really sucked_.

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axod
But the advances in battery technology are lame compared to CPU / memory /
disk.

In the last 30 years, we've gone from having a room full of hard disks storing
32GB, to a memory chip the size of your fingernail storing the same.

In that same time period, batteries have improved a little bit. I understand
it's a "harder" problem, but it'd really be nice if people were working on it.

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berntb
>>but it'd really be nice if people were working on it.

Are you joking?

Consider that electric cars are using similar tech as laptops; there is a
_lot_ of battery research.

(Google e.g. lithium air, I believe that is the latest great hope for getting
rid of the oil dependency...)

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axod
I'm sure a few people are working on it ;)

It's just depressing how much batteries suck.

Why can't we buy AA batteries that last a month constant usage now? Probably
because then we'd buy less batteries, and people are unlikely to buy more
expensive batteries.

Anyway, some new startups working to shake things up would be cool IMHO.

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Daniel_Newby
50 milliamps for a month is equal to the energy produced by 50 grams of TNT.

OK, so not kilotons, but not something you want to carry around either.

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jrockway
Current isn't energy, so no.

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Daniel_Newby
In the context of a ~1.5 V AA battery (the grandparent comment's lament),
current over time is energy.

Regarding internal resistance, the resistance of all materials drops when they
get sufficiently hot, and even a volt or two is enough to get an arc going.
Once that happens it will spread until the entire battery is converted to
plasma. Given the energy densities the other commenter hoped for, the
propagation rate is likely to be at the speed of sound, in other words a high-
order explosion. Which is not surprising given that such a battery would
amount to a stick of dynamite with electrode layers spaced every few
molecules.

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natch
Sweet! Thanks for posting this (an hour before the other submission that
hijacked your link by pointing to page two, I might add).

The only bad thing is it was a bit deflating to see the thing disassembled
while I'm still waiting for UPS's very slow (in subjective terms) delivery
today.

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alanthonyc
I got a knock on the door a few minutes ago...it was the FedEx guy with my
iPad _dock._ Still no iPad.

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nnutter
Guess we can own it?

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PopScreenTeam
That's cool. Very efficient assembly.

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sahaj
2GB of RAM was what impressed me the most. I was expecting 1GB at the most.

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pieter
It's 256MB, apparently. The article says 2Gb(256MB) per die, for a total of
512MB, but <http://furbo.org/2010/04/03/benchmarking-in-your-lap/> tested it
and it's 256MB. I'm not sure where iFixit gets the idea there would be two
dies.

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ck2
How long do you think until someone accidentally shorts or punctures those
massive Li-Poly batteries.

Isn't that battery type particularly prone to explosions (seriously!)

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snom370
I guess that is one reason why the front display is made of quite thick glass
(it seems) and the back is made of aluminum. You would need to give it quite a
beating in order to damage the batteries.

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pak
Intriguing. Somebody secretly took apart the 3G model and found this:

<http://i.imgur.com/It9To.png>

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angstrom
4 iPads to a workstation. It's iPhones all the way down.

