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12 volt of an ordinary inverter battery
voltage meter.set to DC voltsBuy a cheap volt meter.
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.
yes more voltage
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
Usually 12 Volt
12 volt
Borrow, rent or buy a volt meter and test the battery voltage with the engine running. Have someone take the rpms up to about 1500 and test the battery voltage. If it's very much above 14 VDC, you have a faulty regulator. Ideal voltage is 13.5 but if it's anywhere near 17 or more it will destroy the battery. On the other hand, if one or more of the cells are shorted out, normal voltage will cause the remaining battery cells to boil.
No, the battery charger has to match the voltage of the battery it is to charge.
This is not advised! The 9-volt charger might have a current limiter so that nothing burns up, but it any case if left on it will destroy the 6 volt battery by overcharging. A 6-volt charger is not expensive.
Some have a switch for 6 or 12V - if not you will "cook" a 6 volt battery using a 12 Volt charger
Use a volt ohm meter and set it on DC voltage. Put the red (+) on the positive and the black (-) on negative.