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Rechargeable battery - Rate of Self Discharge ?


sikui
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Common to all types of rechargeable batteriesis there is such thing called "self discharge" where the battery actually loses power even though the device it's in is turned off. Is there a "common" rate of self discharge (which it varies between capacity and its chemistry) eg 90% capacity after 60 days (i.e loses 10% capacity)?  ??? ??? ???
Any1 can help?

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Thank you Audioguru. Need further clarification on the graph result - the top end graph curve is it for new battery? and bottom end curve is for used battery???

Is there any test which can be carried out to know the rechargeable battery is holding its charge and amperecity?

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Need further clarification on the graph result - the top end graph curve is it for new battery? and bottom end curve is for used battery???
The top left is a fully-charged Ni-Cad battery.
The graph shows how much charge (capacity) is retained after sitting for weeks. The graph has a range (28% to 77% at 12 weeks) because all batteries are a little different.


Just put a load on it and time how long the battery charge lasts. Most Ni-Cads are rated in mA/hrs at a 1/10th C rate. Look at the graph to see if a battery holds its charge (they don't).
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