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Charging NiMH Batteries.

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malcscott
(@malcscott)
Posts: 1566
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Hi, I have had a nicad charger for many years. But now all rechargable batteries are NiMH types and i find that my old nicad charger does not fully charge them. Why is this?  Malc.

 
Posted : 16/09/2019 9:54 am
crustytv
(@crustytv)
Posts: 11869
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Google is your friend but you will find a lot of conflicting opinions. That said the consensus seems to be you cannot and more importantly should not charge NiMH Batteries with a NI-Cd charger.  This is due to the different charge-rates of Ni-Cad & Ni-Mh batteries, one of three things may happen if you attempt to use a NI-Cad charger to charge Ni-Mh batteries.

  1. The charger will only ever part-charge the Ni-Mh batteries - this is what you're experiencing
  2. The charger will over-charge the batteries - low probability of this happening.
  3. The charger will correctly charge the batteries - Very low chance of this happening.

 

The best sort of charger is one of the more expensive types that can auto-detect when the battery is fully charged and switch to trickle charging mode. Avoid the ones that will simply charge for a set time period as they may well over charge the batteries and shorten their life.

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Posted : 16/09/2019 11:23 am
Cathovisor
(@cathovisor)
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Posted by: @crustytv

That said the consensus seems to be you cannot and more importantly should not charge NiMH Batteries with a NI-Cd charger.  This is due to the different charge-rates of Ni-Cad & Ni-Mh batteries

In one. 

One of my older cordless phones actually had a battery setting in its menu for NiCd/NiMH.

 
Posted : 16/09/2019 11:38 am
malcscott
(@malcscott)
Posts: 1566
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Topic starter
 

Hi, many thanks for the info. My nicad charger i have had for 30 years, Uniross make. I have located Uniross NiMH charger of similar design on the net. Awaiting delivery. Cheers, Malc.

 
Posted : 16/09/2019 12:30 pm
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