lithium ion batteries have chips in them that prevent the battery pack from going too low. i was saying that it was theoretically possible for a jailbreak to damage a battery simply because it ran it too low . maybe caused by lots of cpu usage. or draining the battery too low.
or maybe you just ran too many charging cycles or it got really cold
who cares, pay the $79
the reason to remove the jail break is so you can get your iPad fixed.
if you want to read more about lithium ion battery sudden death please see the following websites
http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries
exert:
Li-ion should never be discharged too low, and there are several safeguards to prevent this from happening. The equipment cuts off when the battery discharges to about 3.0V/cell, stopping the current flow. If the discharge continues to about 2.70V/cell or lower, the battery’s protection circuit puts the battery into a sleep mode. This renders the pack unserviceable and a recharge with most chargers is not possible. To prevent a battery from falling asleep, apply a partial charge before a long storage period.
http://forum.xda-developers.com/showthread.php?t=1168036
Tip #2: Avoid allowing your device to discharge completely
Every wondered why your modern phone, PDA or iPod is able to cheerfully tell you that “Your battery is now exhausted” for several seconds on its brightly-lid LCD screen before switching off? The reason is simple; there is an artificial circuit that shuts off the device when the charge in the battery is too low.
This extraneous circuit is built to protect from the damage that could result if the charge of your lithium ion battery falls too low. If you still don’t get it: if the charge of your lithium ion battery falls too low, the battery can get irreversibly and permanently damaged. So since Lithium Ion has no “memory effect”, it is better to simply charge your portable device as and when you can or remember.
To set your mind at ease, a “charge cycle” means a single iteration of depleting followed by a re-charge until 100% of battery charge. If you consume 50% of your iPod’s battery on day 1, recharge to 100% at night, and do the same thing on day 2, then you would have just finished up one charge cycle of its battery life.
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connect ipad to a mac. i would say mid 2010 or later would be a safe bet
as i repeated before a regular computer's
USB PORT WILL NOT CHARGE AN IPAD WITH ITS SCREEN ON
connect ipad to mac usb port
click on the apple
click on about the mac
click on system report
on the side you will see usb
click on usb
you will see a screen like this in the attachment
the mac is sending 2100 ma to the iPad. this is the energy necessary to charge an iPad
if you see 500 + 1600 extra operating current being sent to your iPad and it still won't charge
YOU ARE SCREWED
if you are screwed, remove jail break. take it back to the apple store and pay $79 for a new battery or pray they give you a new one for free
iit will say if its usb 3 or 2 also
you need to understand, when apple made the iPhone and iPad and released it to the public the knew that computer's stock usb ports were to wussy to charge their gadgets. this is why macs were made specifically with extra current in their usb ports to charge these devices.
you guys got used to the 2100 ma in a mac, and forgot that the iPad needs 2100 ma to charge
to white4s
SHUT UP
ty