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New cells for the 41C´s battery pack



#3

I have repaired a dead battery pack 82120A. I have used new 1/3AAA NiMH cells (150mAh). I have charged it for three hour with the adapter 82059D and it works just fine. I have charged just three hours because I know the rechargeable cells are very sensitive to overcharge.
I would like to know how long must I keep it charging for a full charge. I think original cells are 1/2N NiCd (75 mAh aprox.) so the total charge time should be the double. Does anybody know the recommended charging time for the original battery pack?.

Thanks in advance

Jon


#4

The 82120A manual says 12 to 16 hours for a full charge.

With respect to the 1/3AAA cells, Gold Peak says 16 ma for 16 hours. It just so happens the charge rate of the 82120A is 16 ma. So 16 hours should yield a fully charged pack.

They will typically reach 5.80 volts open circuit when fully charged. I have seen no cell heating (checked with I/R thermometer) after 24 to 36 hours so I would not be overly concerned about overcharging. I charged one for a week once to see what would happen - it seemed to decrease its capacity until it went through two or three discharge charge cycles - it now seems fine and maintains a 16 ma discharge rate for about 10-12 hours.


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