Sure, if the alternator voltage regulator is defective it can overcharge the battery.
Overcharge, often due to a shorted cell.
Yes, but make sure you do not overcharge the battery.
Shopkeepers should not overcharge.You can't overcharge a battery.
Usually, overcharge, sometimes overdischarge. Check the alternator - the regulator is probably shorted.
your car is usually has a 12 volt battery, on the charger set it to 12 volt charge, the batter will tell you how long to charge it usually 4 hours, do not overcharge, will damage battery :)
You can but you can alos easily overcharge the battery.
Defective voltage regulator.
Not necessarily. There could be different components at fault when your laptop fails to charge properly - the power supply (power brick), the charging circuitry inside the laptop for the battery, and/or the battery itself (which in itself also has a circuit for diagnosis, telemetry [battery level, battery health], and overcharge protection).
No, it will overcharge the 6 volt battery.
Defective voltage regulator.
No. The computer and charger are "intelligent" and will prevent overcharging.