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  1. #1
    RC Qualifier
    Join Date
    Apr 2012
    Location
    Warwick, Queensland
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    299

    Confused about NIMH discharge...

    I have 2 x Traxxas Powercell 3000mah 8.4v 7cell NIMH packs.
    I wanted to discharge them. So i searched on some information about discharging Traxxas 7cell 8.4v NIMH.
    Found:
    Discharge rate: As wot charger does. I did it at a rate of 0.50amps
    Cut off Voltage: 6.3v that is 0.9v per cell (7 cell batt)
    So it started disharging and the volts got lower and lower...
    Pic of charger in discharging process...

    When it hit 6.3v it stopped discharging... so far all good...
    OK then i got a multimeter to measure the voltage... set the multimeter to (DC Voltage)
    THis is what i got.

    My main concern is that should it be showing 6.3v on the multimeter or not?
    If so what went wrong?
    If the summit can go through; its not deep enough

  2. #2
    RC Racer
    Join Date
    Sep 2012
    Location
    Coeur D'Alene, Idaho
    Posts
    180
    Readings from a charger aren't always 100% accurate. But 6.5xx volts would be fairly discharged
    2012 Frankenpede
    2008 Stampede VXL

  3. #3
    RC Qualifier
    Join Date
    Apr 2012
    Location
    Warwick, Queensland
    Posts
    299
    So what about the reading from the multimeter?
    If the summit can go through; its not deep enough

  4. #4
    RC Turnbuckle Jr. mike-susieq1's Avatar
    Join Date
    Nov 2010
    Location
    California
    Posts
    4,825
    the reading from the voltmeter is right, under load the voltage will drop but go back up when its not under load. you shouldnt need to cycle nimh cells they have no memory effect. generally when they wont hold a charge anymore they are done for if you cycle them they will get a bad cell in there and then soon the whole pack will have bad cells all over the place.
    Nimh cells are to be stored fully charged if thats what your trying to do then repeaked every few days- 1-2 weeks thats what i do and they are going fine.
    DEU 8:18 ESV

  5. #5
    RC Qualifier
    Join Date
    Apr 2012
    Location
    Warwick, Queensland
    Posts
    299
    OK that solved that problem
    No i am not wanting to store them but just doing a discharge and i have never done 1 before so was a bit confused as to tha out come but it is all clear now thanks.
    If the summit can go through; its not deep enough

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