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[SOLVED] how to charge lead battery with current limiter?

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pinkfloyd11

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dear friends,
I need to charge lead battery in a way that when a really discharged battery, 10.8 volt for example, is connected to charger, no high flow of current must flow.
I need to limit current at 500mA.
Any idea?
Thanks
 

The circuit at that site is a constant current one, and is not, therefore, suitable for charging lead-acid batteries - which should be charged from a constant voltage source.
 
You need a constant voltage regulator with a current limit such as this. You want to adjust the output voltage to about 14V (R4≈2.4kΩ) and for that you need an input voltage of at least 16V. The transistor base-emitter resistor of 1.4Ω shown should give you a limit of about 0.5A.
 
gpezzella said:
dear friends,
I need to charge lead battery in a way that when a really discharged battery, 10.8 volt for example, is connected to charger, no high flow of current must flow.
I need to limit current at 500mA.
Any idea?
Thanks
Click to expand...

Best way is to use multistage lead acid battery charger, which on start lower charging current if deeply discharger battery is detected.

In odler cars manufacturers usually put one power resistor to lower charging current of very discharged battery.

From your words I guess this is some smaller battery in capacity?
 

dear crutschow,

your idea was the best one.

Which is the rule for change current limit value?

Have you link for study and understand this circuit?

Thanks
 
Last edited:

gpezzella said:
......................

Which is the rule for change current limit value?

Have you link for study and understand this circuit?
Click to expand...
Are you talking about a charge rule for the charger or a rule for the battery?

Here is an explanation for a similar charging circuit for a 12V battery.

The charging current limit is ≈0.7V/R1.
 

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