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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Seriesed battery cells irregular charging
Silly wind-up torch but could be anything using Ni-Cad or ni-Mh
multi-cells. LEDs are full bright for a short time after winding up , then drops to low light level, regardless of amount of winding beforehand. One cell is out of kilter with the rest, and in use discharges quickly compared to the others. Bench ps charging that one , in isolation, cures the problem. But presumably it may return , unbalanced charge/discharge across the cells. How to do the isolated charging of one cell properly, the next time in the way of monitoring voltages and charge currents ? |
#2
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Seriesed battery cells irregular charging
"N_Cook" wrote in message news Silly wind-up torch but could be anything using Ni-Cad or ni-Mh multi-cells. LEDs are full bright for a short time after winding up , then drops to low light level, regardless of amount of winding beforehand. One cell is out of kilter with the rest, and in use discharges quickly compared to the others. Bench ps charging that one , in isolation, cures the problem. But presumably it may return , unbalanced charge/discharge across the cells. How to do the isolated charging of one cell properly, the next time in the way of monitoring voltages and charge currents ? The one i bought was total crap - you can get them with a charging jack, they might be less of a disaster. |
#3
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Seriesed battery cells irregular charging
On Tuesday, 26 September 2017 19:22:21 UTC+1, N_Cook wrote:
Silly wind-up torch but could be anything using Ni-Cad or ni-Mh multi-cells. LEDs are full bright for a short time after winding up , then drops to low light level, regardless of amount of winding beforehand. One cell is out of kilter with the rest, and in use discharges quickly compared to the others. Bench ps charging that one , in isolation, cures the problem. But presumably it may return , unbalanced charge/discharge across the cells. likely discharge in the cell from a dendrite. If so the cell's at end of life. How to do the isolated charging of one cell properly, the next time in the way of monitoring voltages and charge currents ? The easiest way is just overcharge them, but it must be done at slow charge, ie 16hr charge rate. The practical answer is new cells. They're very cheap. NT |
#4
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Seriesed battery cells irregular charging
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#6
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Seriesed battery cells irregular charging
N_Cook wrote on 9/26/2017 2:22 PM:
Silly wind-up torch but could be anything using Ni-Cad or ni-Mh multi-cells. LEDs are full bright for a short time after winding up , then drops to low light level, regardless of amount of winding beforehand. One cell is out of kilter with the rest, and in use discharges quickly compared to the others. Bench ps charging that one , in isolation, cures the problem. But presumably it may return , unbalanced charge/discharge across the cells. How to do the isolated charging of one cell properly, the next time in the way of monitoring voltages and charge currents ? Stick to lights with one cell. -- Rick C Viewed the eclipse at Wintercrest Farms, on the centerline of totality since 1998 |
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