Ipad overheating, ipad overheating and not charging

I work with my new iPad connected to my 27 screen monitor
i'm prototyping a website so i constantly browse and laod pages on safari while the ipad is connected with the cable to the screen
the battery has been to 37% for the last 4 hours... basically it seems that the power coming from the screen is not ebough to compensate the power cusmption while using the ipad...
shoudl i return it?

In layman's terms that everyone can understand:
The components in an iPad do not use the exact power & voltage that the battery puts out.
There are various regulators and step-up and step-down circuits to provide the many different levels of power required for the various functions within the device. Memory, CPU, LCD, backlight, touch-screen, speakers, and so on and so forth.. All these have different power requirements. Even different types of memory, RAM and FLASH have different power requirements. And of course, the new CPU and GPU, by default, already consume more power to begin with; and therefore radiate more heat.
The exact state of battery charge and what the iPad itself thinks is in the battery - there can be some discrepancies between the two.
Along with a CPU under load and a battery that is not properly "calibrated", the regulators will be working overtime with conflicting information and strain to correct the imbalances. This is what can generate that extra heat.
Be aware that as the battery discharges, even very small differences (sagging) in voltage cause the regulators to begin stepping up to maintain proper power throughout the device. As power regulators heat up, they become more inefficient and that in and of itself dissipates more energy making the device even hotter.
Each pixel on the LCD uses pico-amps of current at fractions of a volt. That is an extremely tiny amount of current. And the voltages are monitored and maintained to a precision of 0.00002V or greater for each and every pixel. That's precise! The regulators definitely work double-time to keep this precision under control with astounding accuracy. And they do it under various temperature conditions and fluctuating power levels; caused by different loads being demanded of various components.
Playing 3D games, jamming loud audio, storing to internal memory, reading an e-book.. Things like that - all have significantly different power demands.
Note that much of this situation arises from components (and circuit design philosophy) that are running right at the edge of tolerances.
Keep in mind that a full 80% of the internal volume of the iPad3 is battery. That's one BIG energy source!
And there you have it, folks, a lot of stuff in a small space, with a lot going on. No wonder the unit heats up a little.

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Ipad overheating, ipad overheating and not charging

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