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preventing accidental charging of alkalines

preventing accidental charging of alkalines

preventing accidental charging of alkalines

(OP)
Hi all,

I'm in the process of designing a battery powered device to be used in the car.  The plan calls for rechargeable batteries with 12V from the car to provide charging.  However, I would also like the option of using alkaline batteries.  The problem arises if a customer has inserted alkalines in the device and connects the charger.

How can you determine what type of battery you have?  I had thought about internal resistance since alkalines have a much higher impedance than NiMH or NiCD, but measuring the impedance doesn't seem trivial.  I have seen some battery chargers on the market that determine the type of battery, but I'm not sure how they go about doing that.  Perhaps they develop a quick charge-discharge profile?

Any thoughts?  Thanks for all your inputs.

Regards,

Larry G

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