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You are heading at this from the wrong end. The power to the device from the charger remains the same. If the device runs on 12 volts, it needs 12 volts.
South Africa runs on 230 volts, so if you bought a 110 volts version, you buy an adapter that takes 230 mains voltage in, and delivers 12 volts DC to the phone. The phone won't run on 6 volts.
230V
South Africa operates on a 230V supply voltage and 50Hz.
not exact, to charge apropiate needs 10% more than nominal voltage. if not, will not charge the batteries.
And the charger its very important because you can over charge the battery.An example,if you have a 12 Amps Batteries each one if you put it in series will be 24 Volts.at parallel conection will be 12 volts but the double of Amps.
At serial connection will be 12 Volts the amps will be the same but the volts will be 24.
The charger at 12 Volts must be 13.8-14.5 DC Volts and divide the Amps in Hours.
The charger at 24 Volts must be 26-28 Volts. to charge well.
The charger for 12 amps batt example must charge 2 amps per hour at 6 hours = 12 Amps.(2 Amps Charger by 6 Hours Charging= 12 Amps.(Fully Charged.
3 Amperes Charger needs 4 Hours to charge 12 amps Batt.
5 Amperes Charger needs 2 Hours charging an a quarter
All of this is at DC Current.
Most automotive electronics work on a 12 Volt DC system. You must be using adapter capable of providing about 12 to 14 volts because car batteries provide 12 volts; but car alternators put out 13.8 volts. Do not attempt to connect to an adapter that put out AC voltage!
so no lights go green, it depends on the charger however in my experience all of the charger i have repaired have a green light to show fully charge, is it possible to try another charger ? this could imply a faultly charger , can you check the battery voltage anywhere from 26 volts DC to 28.3 volts DC no more otherwise you shorten the life of the battery. You really want the voltage level to be near 28 volts that way you will get maximum distance as well as prolonged life of the batteries in question.
The battery life for these lights are for about 2 years at the most if left uncharged. The best way to determine if you need new a new battery or batteries would be to dismantle the light, remove the batteries and check the voltage with a volt meter. If they are dead, you may be able to fine a suitable replacement at: http://www.batterymart.com/c-04-12-volt-sealed-lead-acid-batteries.html
That`s most likely your problem. When left uncharged for that long of a period,the batteries will discharge below 12 voltDC. The charger only recognizes 12 volts and up. So the charger can`t bring your batteries back up over 12 volts. You will need to get them on a slow charger,like a car charger or have them replaced. If you know someone or have a voltmeter,set it on DC and check each battery.
If it is below 12 VDC,they need to be put on a slow charger or replaced.
TAKE TEST METER ON DC VOLTAGE AND PLACE ON THE TERMINAL IN CHARGER SHOULD READ 12 VOLTS ON 2 OF THE TERMINALS IF YOU DON'T HAVE A METER YOU CAN USE A TAIL LAMP SOCKET AND BULB OR ANY DC LAMP OF A 12 VOLT RATING
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