Does battery self discharge when connected
Does battery self discharge when connected
(OP)
I am an electric engineer, and I read about battery self discharge phenomenon. I was wondering whether a battery self discharge rate is the same when it is unconnected (i.e. in storage) and connected (i.e. when it is plugged into a device and being discharged "normally"). In other words, when I calculate battery life time for a product, should I take add the rated self discharge of a battery to the general current calculations or not? And also-is the answer similar to all types of battery?
Thank you in advance.
Udi
Thank you in advance.
Udi





RE: Does battery self discharge when connected
Your self-discharge current is usually very low level, and would likely alter the lifetime calculation by less than 1%
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RE: Does battery self discharge when connected
I've also designed things that draw less current than the battery's self discharge rate making the battery the major consumer.
If the device has a real power switch disconnecting the battery entirely then the self discharge is only a function of the battery chemistry and the ambient.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Does battery self discharge when connected
My question is really: does the battery self discharge at the same rate when it is being drawn from, or does the self discharge only happens when it is disconnected?
RE: Does battery self discharge when connected
It's the same since it is really a corrosion/chemical aging process that still occurs during usage.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Does battery self discharge when connected
Think of the self-discharge as a parasitic load in parallel with the external load.
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RE: Does battery self discharge when connected
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