I put four AA Ni-MHs on a Power Supply to Recharge Them

"Watson A.Name - "Watt Sun, the Dark Remover"" wrote in message news: snipped-for-privacy@corp.supernews.com...

Yes, slower charging rates work differently. One must consult the manufacturer's specifications.

As charge rates goes up the battery warms, hence a portion of the charge current goes to heat the battery rather than charge it. This is main reason a C/1 rapid charger usually does not charge "rapid charge" for one hour, the thermal sensor shuts it back to about C/10 with the batteries at about 80%. There are ways of getting around this so batteries can be charged to almost

C/5 should be fine, but you might check the battery temp around 5 or 6 hours. If warm to touch, you might want to back the current down a little. If they are only slightly above room temp then let them go at 300mA.

"Watson A.Name - "Watt Sun, the Dark Remover"" wrote in message news: snipped-for-privacy@corp.supernews.com...

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Thanks. I've had four sets of four Ni-MHs in my digital camera case for awhile and I found that they were nearly discharged after a few months of not being used. So I have to keep up on maintaining them in a relatively fully charged condition. I think I should get another charger or two, just to keep on hand so I can drag out all four sets and charge them overnight. Or else use the ol' bench PS, like I did this time. ;-)

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Thanks. I think I'll buy a few more chargers, since the newer ones all seem to have a timer and cut off automatically. Makes for a safer stuation. I could go off and forget to remove the cells from my bench PS and that might not be a good idea. :-)

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In theory yes but there's more chance of damage if overcharged using a higher current. With NiCads, if I remember correctly, you can overcharge at C/10 for a few hours and at C/15 for 100 hours. Can't be sure about NiMh but I would be caution if you want long life.

On Fri, 29 Oct 2004 03:58:44 -0700, "Watson A.Name - \"Watt Sun, the

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NiMh self discharge faster than NiCads. About 1 month for NiMh and 3 Months for NiCads. Some 9v PP3 NiCads will last for many months, I use them in Fire Detectors but I see NiMh are not recommended in that application. Sadly that's the price you pay for reducing the so called 'memory loss' of NiCads.

Can't win 'em all...!

I don't think it's nearly that bad. Four months to about 50% remaining charge for the ones I use. That's at 20°C. At 40°C you can get down to

Best regards, Spehro Pefhany