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It is a good idea if it is done correctly. You have to connect two 6 volt batteries in serial : (-) 6 volts (+) ----- (-) 6 volts (+)
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(-)----- --12 volt charger----- ---(+) The negative cable of the charger is connected to the negative(small pole) of the left battery. The positive cable of the charger is connected to the positive(big pole)of the right battery. Of course, the positive of the left battery is connected to the neg. of the right battery(two 6 volt batteries in serial are equivalent to one 12 volt battery). By the way, be supervised if it is the first time you are charging battery, Avoid sparks, fire... around batteries because hydrogen is produced by discharging batteries and hydrogen and oxygen are produced when charging. Batteries can explode like TNT ! Moreover, do not charge a frozen battery in winter, it explodes too, splashing sulfuric acid; warm it first and charge it after.
It is possible to charge two, four, six ... 6 volt batteries as long as your battery charger sees only 12 volts. They must be connected in serial and parrallel :
(-) 6 volts (+) --- (-) 6 volts (+) | |
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(-) 6 volts (+) --- (-) 6 volts (+)
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(-) 6 volts (+) --- (-) 6 volts (+) | |
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(-)----- --12 volt charger----- (+) Sorry for the poor schematic
Hope it helps and play safe.
Dave Dono.
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