Anywhere from 13.5 to 16 volts at the battery with the engine running.
Before you try to charge it with a batter charger. take the battery to an autozone or similar to test the batter and see if its still hold a charge. or if you know that the battery is good then jump start it using another car battery with jumper cables. just remember RED to + and Black To -
If the 12 volt solar panel output voltage is always higher than the 6.5 watt battery voltage. To charge a battery, a voltage greater than the battery must be applied to the battery, otherwise the battery will try to charge the charger.
NO, voltage of the charger must match the battery voltage.
You can't charge the battery with those 245 watts unless they are being 'pumped into' the battery at a higher voltage than the battery puts out. If you can exceed the voltage of the battery, that 245 watts will definitely charge a battery.
No, you cannot charge an 8 volt battery with a 6 volt charger. The voltage of the charger must match the voltage of the battery.
Never heard of a half battery. I have heard of half battery life, meaning the battery is half charged. The voltage of any battery is the same at half charge as it is at full charge.
Whether it says it will or not, battery chargers will charge any battery, as long as they are for the same voltage. The charger puts out a set voltage, it doesn't know whether the battery is Energizer or not.
No, the battery charger has to match the voltage of the battery it is to charge.
Check all of your connections from the alternator, see if the are loose or corroded. Make sure battery cables are not loose or corroded. Check the battery ground wire connection to the body of the car also. If everything appears OK you will need to test the alternator output or have it tested. You may need to replace the alternator or voltage regulaor.
To charge a battery, the charger voltage must be higher than the battery voltage. If a AA battery (or any other) has a normal voltage of 1.2V the charger voltage must be at least 1.2V. The type of voltage supply and its current capability is immaterial. No, the charging voltage have to be larger than the battery voltage, to charge 2 AA batteries, that is 3 volt if connected in series, so a voltage of at least 4 volt is needed
the voltage of a battery could be larger than the emf if you are to charge the battery, in that case V=E+Ir .
NO, a 12 volt battery cannot be charged with a 6 volt charger. To charge any battery, the charging voltage has to be, at least, slightly higher than higher than the voltage of the battery. Current flowing through the battery is what accomplishes the charging, and no current will flow at or below the voltage of the battery to be charged.