HP Forum Archive 01

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NICAD batteries Message #1 Posted by Tom Peddle on 21 Oct 1999, 7:14 a.m. 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.

Re: NICAD batteries Message #2 Posted by DaveC on 21 Oct 1999, 8:40 a.m., in response to message #1 by Tom Peddle The time would be roughly proportional to the capacity of the cells.

Re: NICAD batteries Message #3 Posted by Tom Peddle on 21 Oct 1999, 9:22 a.m., in response to message #2 by DaveC 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.

Re: NICAD batteries Message #4 Posted by DaveC on 21 Oct 1999, 4:19 p.m., in response to message #3 by Tom Peddle 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.

Re: NICAD batteries Message #5 Posted by Joe on 24 Oct 1999, 1:51 p.m., in response to message #1 by Tom Peddle 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.

Re: NICAD batteries Message #6 Posted by Steve on 24 Oct 1999, 9:24 p.m., in response to message #5 by Joe 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 :-)

Re: NICAD batteries Message #7 Posted by Stefan Vorkoetter on 27 Oct 1999, 1:41 p.m., in response to message #5 by Joe 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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