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When it is charging the screen reads: Battery Charging. When it is fully charged it reads: Battery Charged.
Laptops that's battery is fully charged does not weigh any more or less than one that's battery is not fully charged. If there is a difference, it would be so small you would not be able to tell.
A fully charged 12 volt automotive battery should have 12.68 volts.
where the battery bar is..it will be fully green
12v
It varies by manufacturer and battery.
A fully charged 12 volt battery will read about 12.6 volts, or 2.1 volts per cell.
Phone off: Your phone will show a full battery and say "Fully Charged" Phone on: on the right top corner your battery will show a full battery and blink
No, after the battery in your laptop is fully charged the power is cut off to it.
If the cable connections are clean and tight, the battery puts out less than 12.3 volts fully charged, will not stay charged, has been run down more than once, or is over 4 years old it is probably bad. Remove the battery and have it tested at an Auto Parts Store.
No, but it is good practise to fully discharge and then fully charge up your iPad on a regular basis to maximize battery life.
If you need to jump start the car then the battery may be fully charged but it is defective and needs replacing. A full charged battery will read 12.6 volts at the posts with the engine not running. 12 volts indicates the battery is only 25% charged.