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Most lithium small radio batteries are 3.6 volts. If AA or AAA batteries, multiply by 1.5 volts. 4 batteries = 1.5 * 4 = 6 volts MAXIMUM. Rechargeable batteries are 1.2 volts. Your charger would be a much higher voltage because it takes power to "push" the charge into a battery. You didn't say, so I am assuming you want to operate the radio with a wall charger. I've done this by soldering the wires to the battery contacts. You need a higher voltage than 3.6 volts, but milliamps is more important. You need enough milli amps to get the radio to transmit. Too much and it frys, literally. So, this is all on you to decide if the risk is worth it. I use a 5-6 volt power supply set on no more than 1 amp (800 ma is my favorite size) 1 amp = 1000 ma. Let us know if this helped!
Karrie if the chair has an on-board charger you can read the charger voltage at the charger port located under the front of the joystick. Set a meter to 200vdc and plug the leads into the two outter ports under the joystick Plug the charger into the wall socket and you should be able to read the charge voltage it should be 27-30 volts. If you have a off-board charger you will have to read the voltage at the batteries with the charger plugged into the the charger port under the joystick. Hope this helps
Get new batteries and make sure the charger is charging by checking the voltage at the charger port located under the front of the joystick. With the charger plugged in set a voltmeter to 200vdc and plug the leads into the two outter holes of the charger port. You should be reading 27-32 volts if the charger is working correctly. Without the charger plugged into the wall outlet you will be reading the battery voltage 25-27 volts fully charged Hope this helps you
Sounds like you have a bad charger. If you have an on board charger, plug it in to the wall and test the voltage at the charger port at the front of the joystick between pins 1 and 2 (the two eyes of a happy face). If you get between 26 and 28 volts and the voltage rises as you charge, then the on-board charger is OK. If not check the AC cord and connections to the charger, including the lego black block and/or connection of the charger at the controller. The type of connection depends on year and serial number.
If you have an off -board charger plugged into the front of the joystick, check your voltage directly at the batteries with the seat flipped back. With the off-board charger plugged into the front of the joystick measure the voltage being applied to the batteries at the large black 2 pin plug coming from the controller to the batteries. When you take this measurement leave the plug connected and put your digital voltmeter probes in the connector at the back (non-contact side). With the charger on, voltage should read between 26 and 28 Volts or come to that voltage after some time.
On board chargers run about $200 and off board chargers around $300.
Invest in a good AC cord if yours is questionable. For $8, I have fixed many of these chargers with a new AC cord from Radio Shack. Hope this helps.
flobo I assume that its the on-board charger and that it is the gray charger with one light. This charger light will only come on when the chair is fully charged. Now if you have left it plugged in all night and still have no light then I would think you have a bad charger. If you have a digital voltmeter you can check the battery voltage throught the external charger port under the joystick. Set it on 200 volts and insert each probe into the outter pin holes and you should be able to read the voltage. Without the charger plugged in you will be reading the total battery voltage 24-27 volts with the charger plugged in 27-30 volts also check the meter with the charger plugged it should show something above zero and gradually decrease as the batteries become fully charged. Hope this helps
The measurements below are for a 12 volt charger or across one battery at a time. In a 24 volt charger or across both batteries at once, double the values. The charger will not show any output unless connected to a battery. To test the charger, attach the charger to the battery but do not plug in the charger. Connect a meter to the battery and read the voltage (9.8v - 11.6v). Now plug in the charger. Read the battery again (13.6 - 14.2v). The voltage must not be higher than 14.8 on the battery or the battery will over-charge - the charger needs service. If the voltage does not come up to 13.2v, the charger is not running. Again, the charger needs service. Be patient. You can wait ten minutes and measure again. Batteries respond slowly to the charger.
Don't worry about the 5 volt difference. All supply voltages are nominal (that is, they will fluctuate around the stated value). Your charger should have no problem with 125 volts (just don't try to use it in a country where the voltage is 230).
You didn't mention what brand & model of wheelchair/scooter you have. To properly check to see if the charger is working correctly is testing the total voltage of both batteries together while the charger is plugged in to the controller joystick. First check the total voltage of both the batteries together before you plug the charger in. The total voltage of both fully charged batteries together should be around 24.5 to 26.5 volts. Plug the charger into the charging port on the powerchair/scooter. Now with the charger on, the voltage should read at the very least 1+ volts more than the total voltage measured earlier. If less the charger is bad and will need to be replaced. Hope this helps, if so please rate this solution which will help others who may have the same answer and thank you for using FixYa. Flavadave75