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Jobmate 18 volt chordless drill charging

I have a Jobmate 18 volt chordless drill # 54- 2891-8 with battery # 54-2801-4 .
How long do I leave the battery on the charger for?
The adapter that plugs into the charging base says 120vAC input 25vDC-500ma output.
Can any body help

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  • Greg Robbins
    Greg Robbins Jan 21, 2009

    That's the problem I don't have the manual but an hour is a good starting point

  • Anonymous Mar 08, 2009

    Black & Decker 12 volt battery charger failed. Any fix?
    I have had 4 of these fail.



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About 60 minutes...max 90 minutes. Do NOT leave it on the charger for hours and hours...that just cooks the battery.

And switch regularly between the two batteries...else the one that doesn't get used will die.

Posted on Apr 04, 2009

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Is there a recal on Jabmate 54-2801-4 18 volt drill

Posted on Mar 26, 2010

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My jobmate 14.4 v manual says 3h or less

Posted on Mar 09, 2010

  • fuzzy_t Feb 21, 2011

    My jobmate 14.4 is 20 years old with the original battery and i leave it on for 3 hrs(manual)

  • Mo Bock Sep 27, 2013

    That's what it says on the box for the 18v battery as well.


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I dont have any information on this drill but most cordless products that I deal with the charge time is usually around 1 hour. Do you still have your owners manual that should be in there. Hope this helps

Posted on Jan 21, 2009

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1 Answer

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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