What is the prognosis for such a battery , run down to 0 volts. Recovered perfectly happily taking normal charge and holding, but will it be reliable, have much reduced capacity etc.
-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on
Our secretary routinely lets her radio flatten (she forgets to turn it off on a Friday) the 4500mAh NiMH C cells in it. She bring them back to me, I put them on my FMA universal charger and they routinely take 4500+ back in and she hasn't complained about any shortage of run time. I guess if it makes it through the week, she's good with it.
Jim
Bad idea. Wait until one of the cells reverses, and it explodes in the charger.
As she doesn't take it home over the weekend, why doesn't she run the radio off AC?
it
I'm so used to equating seeing 0V on a nicad with chuck-it, so often the case. A high current blast , will often fuse the whisker, the cell always seems to repeat its dendriting chemistry, so never a guaranteed cure.
-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on
May depend more on how long it stayed in a discharged state. I test my batteries for capacity to weed out the bad ones and find that an immediate recharge doesn't seem to hurt the capacity any.
A cheap analog quartz clock with a dummy load in parallel is all it takes to check individual cells, series zener and cap across the clock for multi cell batteries - well worth the time and effort IMHO.
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test. My charger also charges instantly 2mn.
Obviously, it is good enough for her. :)
When it will not make it a week, I'll replace them.
Why don't you just force her to run it off AC? Hide the batteries, and she'll have no choice.
She has a line cord, but takes it to other areas with her, depending on the task at hand, and there isn't always a receptacle within easy access. Besides, it is a small thing compared to dealing with an unhappy woman.
Jim
Get another line cord for her and make her happy.I have a few old radios I bought at thrift stores.Some of them didn't have a line cord.An old detatchable electric shaver cord works just fine. cuhulin
Charging with short pulses followed by a discharge pulse rather than constant current means any tendency to go internally short circuit disappears in around 5 cycles or so.
This principle has been almost 45 years. Honeywell made such a charger for their Strobonar flash units, which not only rapidly charged the battery pack, but was claimed to "heal" damaged packs.
A test in "Modern Photography" confirmed that it really did these things. Some years later, when I asked the late Bert Keppler why we'd heard no more about this charger, he told me "It didn't work. The batteries blew up sometimes."
Of course, that was 40 years ago. I assume things have changed.
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