Understanding "600mAh or greater"

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Hi. I'm a newbie here. I'm posting this because the rechargeable battery unit for my blood pressure monitor no longer holds a charge, and I don't understand something quite basic.

The old battery (SANYO Cadnica 4N-600AA) is a plastic encased pack of 4 cells, AA size, with two (black and red) wires terminating in a black plug.
The case reads "4.8v 600mAh" and it looks like the following.

LINK TO GOOGLE IMAGES:
https://www.google.com/search?q=san...VuwosBHd_UAF0Q_AUoAXoECAEQAw&biw=1920&bih=955

The user's guide says 4.8v and "600mAh or greater" is OK for replacement.

If I were to simply wire 4 rechargeable size AA 1.2v rechargeables (the rechargeables I have handy all say "minimum 2000 mAh") in a series, would that work?
Or is the 2000mAh going to cause problems?

Thanks.

David
 

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Hi,

A battery is a storage of energy.
The Ah value is proportional to the energy it can store (indeed Ah × V = VAh = Wh = energy)

So it's like a fuel tank in a car. If your car needs 8 l/100km and you want to go 500km then the tank needs to be 40l (or bigger). If it is 50l, then there is no problem. The car still will draw just 8l/100km.

But: if you have 4 batteries each 1.2V / 1000mAh and ...
you connect them in series, then you get 4.8V, 1000mA
(If you connect them in parallel you get 1.2V 4000mAh)

Klaus
 
Last edited:

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mA-h rating callout may also be a lazy-minded proxy
for peak current capability. Which varies by chemistry
among same-physical-sized cells.
 

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