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Old Mar 20, 2010, 02:06 PM   #1
Semdk
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The iPad battery

I wanted to buy a HyperMac battery for my iPhone and (iPad) and wondered how big the iPad's battery is..
At Apple.com the Tech Spec of the iPad says 25Wh, but since the specs of the HyperMac batterys are in mAH wonder how much those 25Wh are in mAH..
And how much a 1800mAH battery would charge the iPad... (:
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Old Mar 20, 2010, 02:11 PM   #2
Gav2k
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I would wait till it's released mate to be sure.
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Old Mar 20, 2010, 03:40 PM   #3
spazer
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Here is the formula to determine mAh:

watt = amp * volt

So for the iPad:

25Wh = amp * volt

Ah = 25Wh / volt

mAh = Ah * 1000

We need to know what the voltage of the iPad battery is. Anyone know?

Last edited by spazer; Mar 20, 2010 at 03:46 PM.
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Old Mar 20, 2010, 05:03 PM   #4
Semdk
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Since the iPad uses (or can use)(the new adapter is just 10W instead of 5W) the same adapter as the iPhone/iPod's, does that mean that it uses 3.7V like the iPhone?
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Old Mar 20, 2010, 05:13 PM   #5
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Quote:
Originally Posted by spazer View Post
We need to know what the voltage of the iPad battery is. Anyone know?
Nah. We have everything we need.

Hypermac batteries are 5V packs, so the "Micro" will be about 18Wh. The "mini" is the best bet for a full recharge of an iPad--with room to spare (36Wh).

The nano will get the iPad to about 1/3 charge.
Quote:
Originally Posted by Semdk View Post
Since the iPad uses (or can use)(the new adapter is just 10W instead of 5W) the same adapter as the iPhone/iPod's, does that mean that it uses 3.7V like the iPhone?
It probably does, but there's no information on it yet. It's almost certainly in the 6500-7000mAh range if you're curious (6750 assuming it's 3.7v).
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