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I have a Hitachi 18 volt charger that has stopped charging. Is there any internal components that may be able to be replaced or is it cactus?

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Unfortunatly the only option I know of is to replace it. Thank you

Posted on Apr 01, 2011

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I need to know what the output needs to be on the charger of an 18 volt jobmate cordless drill.


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.

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1 Answer

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any 18-20 volt laptop charger should work only need correct power plug and that can be easily changed if necessary with soldering iron and volt meter. using old charger plug as replacement. volt meter is used to check out correct polarity of plug before and after you re solder plug on.generally outside is -ve and center is +ve ,alternatively go to ebay or google and type in Sony Vaio PCG 7Q1M charger,or type in part number ,or try 18-20v laptop charger, that is what I do when I need a replacement charger,cost around $10 delivered usually.

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The various rates of flashing are error indicator codes and should be explained on the charger case. They are for the condition of the battery's though and not the charger. It sounds like the charger itself is bad. Can you return it for a replacement? Is it still in Warranty? For whats its worth, I went from Milwaukee tools to Bosch to De Walt before being satisfied with performance. I hope this helps.

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1 Answer

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If both lights on the charger are flashing it is indicating you have a bad battery and the charger will not charge the battery. The charger has circuitry that tests the battery and if it 'thinks' the battery is defective it will not attempt to charge it. The only way to verify whether it's the battery or charger is to try charging your battery on another charger or try charging another battery on your charger. Most of the time it's a bad battery.

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1 Answer

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This can happen if the battery is too dead for too long. Keep trying to make it work like you have maybe 20-30 times. Or you can leave the battery in for a few days and let the logic chip do it's job. It should start working in a day or two.

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Drill will not operate. I charged batteries but still will not operate. Is there an overload reset?


Just try to buy a new battery and test.If persist,change the charger. Bet the bats are dead.

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hi

it shows you that the battery is charging.

regards savumihai71

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Can a bad ryobi 18 drill ruin a new 18volt ryobi battery


If the drill has a short in it, then yes, it could short the battery out. Probably in the trigger switch.

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