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Designing with rechargeable and non rechargeable batteries

ionut Fasola
Intellectual 590 points

Hello

I am wondering that if , from your experience, is it common to use in a product both  rechargeable and non rechargeable batteries (1 or 2 in paralell , CR123) and the product to have embbeded a charger for when the user puts rechargeable battery. It has also a buck-boost converter whoch regulates to 3.0V in order to accomodate the 2.0 - 4.2 V range (2.0-3.2 non rechargeable, 3.0 - 4.2 V rechargeable)

I need to discriminate which kind of battery did the user put, or at least to protect the system if he tries to charge a non rechargeable battery. 

My brief research on this matter did not revealed to much informations.

Any ideas and thoughts regarding this tipic? How does a nonrechargeable behaves when you try to recharge it? How should I protect the system. 

Thanks

  • 0
    TI__Guru**** 167236 points

    Hi Ionut,

    None of the TI chargers have a means to determine the battery chemistry.  I have seen some presentations about algorithms for u-processors, like TI's MSP430, that supposedly can do that but have never seen one working.   A non-rechargeable battery swells and starts leaking if you try to recharge so it is not safe to do that.

    Regards,

    Jeff