NICAD batteries



#8

Hi,

Does anyone know what the original capacity (measured in mAh) of the rechargable batteries is? I guess these changed with time, the oldest NiCads I've seen are 350mAh.

When making up a new pack I used 500mAh AA cells, 900mAh are now available, what length of time could I expect with these? My manual says the 67 will run for 3hours between charges when using the original pack.

Tom.


#9

The time would be roughly proportional to the capacity of the cells.


#10

Yes, I know this that is why I need to know what the original capacity is so I can then estimate the new operating time between charges. Then I can see if I can leave the transformer at home.

I don't want to leave the calculator on for a few hours to see how long it lasts as this is unrealistic and if I miss the time when it goes down I'll have to start over.

Also the charge rate of the transformer is set for the original batteries, probably (original capacity) enter (10) /. As I have fitted higher capacity batteries it will take longer to charge them fully.


#11

Apologies for confusion, I *believe* the original cells were 450mAH, Expect around 6 hours operation. 3 hours was always an average usage figure. If you have the manual to hand (which I dont at present) maybe you could deduce the rate I have a feeling its around C/8 with the machine off.

#12

Asking about battery capacity is like asking a bunch of fishermen who caught the biggest fish. The first liar never has a chance! The fish (or capacity) gets bigger everytime the story is told. Some of the claims for battery capacity are nothing short of ridiculous!

I assume you're talking about the 82001 batteries that use sthree AA NiCad cells. I don't know what the capacity of the original cells that were used in them was but I use Sanyo cells to rebuild them and Sanyo rates them at 600 Ma-Hour. That's their standard cells. They do have some higher capacity cells.


#13

Many of the early AA nicad cells were rated at capacities as low as 450 mAh. Recently I have seen nicads (not NiMh) with ratings somewhat higher than the 600 mAh quoted by Joe, although I can't remember exact figures.

I'd suggest that new nicads would give between 50% and 80% more life from a charge than the old ones did when new.

Considering that the ones being replaced are.. well, old, you should expect a dramatic improvement on them :-)

#14

Sanyo's standard AA cells is 700mAh these days, that being the 700AAC. Sanyo also has an 1100mAh NiCd (yes, NiCd, not NiMH), the 1100AAU. I use these in radio control applications, and they do indeed provide 1100mAh of charge.


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