Some times the cables between batteries corrode and it cause a disconnect- check all cables on the posts to see if one is broken.
Is the battery fully charged?
Yes, the battery is fully charged.
300 miles
When it is charging the screen reads: Battery Charging. When it is fully charged it reads: Battery Charged.
Yes, all batteries are fully charged when the leave the factory.
No, a fully charged battery does not weigh more than an empty battery. The weight of a battery remains the same regardless of its charge level.
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.