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No, after the battery in your laptop is fully charged the power is cut off to it.
Take the battery out.
Is the battery fully charged?
make sure the battery terminals are real clean and tight.
Dead cell in battery or something is on pulling power from the battery. Disconnect the negative battery cable overnight with the battery fully charged (12.6 volts). If the battery is dead the next morning it has a dead cell and needs replacing. If however the battery is still fully charged then a light is on somewhere or a relay is stuck closed.
The battery has enough power to trim an entire football field 2 times.
Over time you will shorten the lifespan of your battery. Once it's fully charged if you don't need to use the battery just unplug it from the laptop and only work with mains power.
They all can but rarely freeze solid but cold temp does reduce power
Be sure the battery is fully charged before you start. A fully charged battery should read 12.68 Volts. If the battery is very low when you check the alternator output it will not give you an accurate reading.
maybe 30 mins
The alternator provides DC power for all the electronics and the engine. It also keeps the battery fully charged.
If the battery of your MacBook is fully charged whilst you have the power cable plugged in, then the MacBook will switch to battery power instead of wasting electrical power from the plug. Once the battery is run down again, the Macbook will switch back to electrical power from the plug.