nickle metal hydride battery charge ?

Sep 07, 2004 2 Replies
I

i am using a 12v 200mamp battery charger to charge 2 aa nickle metal hydride batteries in series



any particular reson why charger should get really hot to touch and the batteries rather warm?


the battery charger is a charger used to charge wireless phone


i am assuming the batteries are absorbing large amounts of current and probably acting just as a short across the charger



takes about 4 hours for things to get really warm



amy comments really appreciated



i am not an electrical engineer tia


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G

Assuming

  1. Your charger delivers nom. current (200mA) until the overcharge limit is reached.
  2. The two AA batteries are in series. A simplified power calculation indicates that when your are charging the two AA in series the circuit dissipates ~ 2 W. To this, one has to add the power dissipated by the AC to DC conversion and the rest of the electronic, perhaps in total ~ 3 W. That could make the charger quite hot. In any case, if the charger has a plastic cover, keep it open while charging. Gene
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B

does the charger state it will do nickle metal hydride batterys or is it designed for nicads only?

Ben

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