Yes it will ruin. Water conducts electricity. The battery will short out if submerged.
In a conventional battery, the anode and cathode are submerged in a elektrolyte
Ruin the battery.
Yes, if the negetive battery cable is not connected propperly to the battery, it will ruin the alternator and probably kill your car.
Most definitely you can ruin it. Always charge an auto battery with an automatic charger that shuts down when the battery if fully charged.
You will ruin the battery.
Yes
Yes, if it is allowing the battery to be overcharged, it will ruin the battery.
Yes, it can ruin a battery and it can explode.
yes it can
If you do it correctly, no, you will not harm your battery.
Yes, overcharging the battery will ruin it.
Keep the car light on