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lead acid battery internal resistance

lead acid battery internal resistance

lead acid battery internal resistance

(OP)
Does the internal resistance of a lead acid battery increase as it discharges and what are typical resistance values?

RE: lead acid battery internal resistance

In short, YES.  There are no typical values that I have been able to find.  The resistance is a function of plate area, condition of the battery, and type of lead-acid battery.  Whether it is deep-discharge type or regular car battery enters into the equation.  Lead-acid/calcium, such as you would find in a UPS are different yet.
Not much help, but hopefully it helps you understand the parameters you face in arriving at a nominal resistance.

RE: lead acid battery internal resistance

I always thought the battery condition could be estimated by the output no-load voltage. Maybe not.

RE: lead acid battery internal resistance

Hi buzzp, your statement is correct, IF the battery is fully charged.  As a lead-acid battery ages, more and more sulphate builds up on the plates, which lowers the open-circuit voltage of the battery.  This is the same thing that happens as a battery discharges, except with aging the sulphate is such that it can't be re-absorbed during the charging process.  So, in other words, you have two separate chemical conditions which affect internal resistance of the battery

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