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Drill battery charger outputs.

Discussion in 'Tools and Materials' started by braniff, 25 Sep 2018.

  1. braniff

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    1) With an old Hilti charger, TCU12/24M - according to the label, input 240V, output voltage is 12V. I have no battery to try it with and I've never actually used the charger. I just want to see whether its serviceable.

    Anyway - green light comes on. It has five terminals in the hole. Voltmeter across various combinations of terminals gives either a few mV, or 5.61 V (five point six).

    Is this because the charger doesn't raise the output until a load is sensed? i.e. a battery is inserted?

    2) With a 14.5 V DeWalt charger, which is in frequent use and works fine, when I put a voltmeter across the two terminals I get a reading of 51 V (fifty one). Can this be normal?

    Thanks very much.
     
  2. SammyInnit

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    51v sounds irregular.

    5.6 over 2 pairs will give you nominal 12v probably for cell balancing and the 5th terminal will be some kind of communication such as temp sensor or overload, cut off etc.
     
  3. braniff

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    Thanks Sammyinnit.

    I just measured my other DeWalt 14.5 volt charger - it also reads 51 volts!
     
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