Special charger needed for Nickle Metal Hydride?

Discussion in 'General Electronics Chat' started by Gdrumm, Sep 15, 2010.

  1. Gdrumm

    Thread Starter Distinguished Member

    Aug 29, 2008
    684
    36
    I have an old cordless vacuum with a 14v NiMH battery, but I don't have the charger.

    Can I use one of my many wall-warts (same voltage, or slightly more) to charge it?

    (I know how to set up tips and polarities, etc.)

    Thanks,
    Gary
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,346
    Hello,

    Here is a quote from the Batteryuniversity :

    They need a special charging device to prevent overcharging.

    Bertus
     
  3. marshallf3

    Well-Known Member

    Jul 26, 2010
    2,358
    201
    If it's old the batteries may already be past their useful life. I'd try charging it at slightly higher than the 14V for an hour or so, if it will still charge you could go on to figuring out the amount of time at a specific current you'd need then plug the charger into one of those $4 timers.
     
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