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18 volt battery charger will give out 20 to 22 volts. and drop off while charging. to around 19 volts. its just finding the right amps. as this is the most important part. these can very from 3 to 20 amps. some cheap chargers are 1 or 2 amps and can take up to 8 hrs to charge a battery. as an even a charger that says 18 volts at 8 amps or 6 amps should be fine. really depends on the manufacture setup.
During the initial state of the charge, the charger operates in a fixed-current mode. This means that the current will be held at a constant rate until the battery is charged to a bit over 18 Volts. During this phase, the output of the charger will not be 18 Volts. This is done for safety and battery preservation; forcing 18 Volts on a battery discharged down to 15 Volts or less could cause the battery to overheat. If no battery is connected, the charge controller may hold the output low until a battery insertion is detected.
The exact behavior of the charger depends on the chemistry for which it is designed, whether Nickel-Cadmium, Nickel-Metal Hydride, or Lithium ion. If the output of a known-good battery is 18 Volts after charging, and it has normal capacity, the charger is working properly.
However, a bad cell in the battery changes things. If you run a Ni-Cd battery down too far, the weakest cell in the battery may begin to reverse charge from the current coming from the other cells. This usually causes an internal short circuit, and the cell will be stuck at 0 Volts. A battery pack with one shorted cell will read 16.7 -16.9 Volts when fully charged, and the drill will not have the peak power it should. The charger will give you a battery fault indication if it is equipped to do so.
They look different in their shape where the battery goes so I would say no. To be safe always use the charger from the same manufacturer. There are a few different types of batteries too so it is always best to use the model number of your original charger to search for the replacement.
Hi, you're Rectofier has failed if you have A/C voltage and no D/C voltage. This is what converts A/C volts to D/C volts. If you have a diagram or any parts manual, you can locate this part and replace it. You will need to go to a place that repairs these chargers, or where you bought it to order or but a new one. Sincerely, Shastalaker7
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).
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