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Likewise, when it hits 100%, it doesn't actually stop there, it continues charging even further. … and then put it on charge again, it won't actually charge it any further, and will stay on 97% until it drops lower than that, at which point it decides it has safely depleted enough to make it worth charging …

The rule of thumb on interchanging charging units is that the rated wattage for a given charger is considered the maximum that the charger can safely deliver, and not what it will deliver all the time. …

The normal method is to show 100% full when the battery stops charging. … OSX won't bother charging a battery that was at 100% until it has dropped sufficiently to make charging it back up worth it without causing potential battery health issues. …

It's all about charging your battery efficiently, resulting in minimal wear and tear where possible. So, to try to illustrate it by example: You start with a flat battery, and charge it. … The green light probably shows on the Magsafe to indicate that it's not even trying to charge, likewise the menubar icon shows a plug indicating full charge, rather than the lightning bolt charging indicator …

Charging more slowly won't make any difference, other than reducing the slight side effect of heat buildup on the iPad. …

Apple transitioned fully to charging over USB only, although for a while both Firewire and USB charging were an option. … This caused a bit of a row when it happened, because for years 3rd party manufacturers for charging docks and speaker docks etc never bothered to update their designs to use USB when warned that the Firewire …

If you are charging from a PC with no option to turn off the USB port as such, then you might have a preference depending on if you leave the cable in or not etc, but it's just that; a preference. …