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    The publication date for issue 289 is the 10th of December, meaning subscribers should receive their copies during the week leading up to that date. It is also available from caving suppliers such as Inglesport and Starless River, or from our new website

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Recharging NiMH batteries


Active member
I know there's a depth of battery knowledge on the forum, so this should be an easy question:

I have a set of 4 AA NiMH batteries (IKEA's 'Ladda 2450') and both my caving light and the charging unit take all 4, so that's easy, I always charge the full set together.

Today, some Christmas lights were short of a set of 3 batteries, so I 'borrowed' the caving batteries (with little prospect of them being used before Christmas :().

When I'm finished with them, what's the best option for recharging - should I charge the 3 partly-used batteries separately from the remaining 1 (barely-used), or will the charging unit be smart enough to do the right thing if I charge them together as normal?

The charger was also from IKEA (it's called Kvarts, which is nice).  Actually, I now see they only cost ?6, so I may have answered my own question - you don't get a lot of smarts for that price, do you?


From the Kvarts manual (emphasis my own):

  • Charge 1 to 4 pieces of HR6/AA and/or 1 to 4 pieces of HR03/AAA rechargeable batteries.
  • 4 charging channels.
  • Charge is terminated by individual minus delta or zero delta voltage sensors (-dV/dT or 0dV/dT).
  • Charging status with LED indicator for each channel

So you needn't worry about overcharging I don't think?

Well, you needn't worry about overcharging any more than usual. There is some research suggesting that using the minus/zero delta voltage point for NiMH might be overcharging the batteries and reducing their lifespan!  :confused:


Active member
Thankyou Ari  (y)
- and thanks for not saying RTFM , which would have been an appropriate response :)