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TMS320DM365 back-up battery solution

I am currently using the Appro camera reference design to implement a DM365 back-up battery solution.  The Appro appears to use a circuit that charges a coin battery when system power is available, which is what we want.  However, when I looked up the coin battery part number from the Appro design, it appears to be a non-rechargeable battery, which does not make sense to me.  Can someone recommend a rechargeable 3V coin battery that would be sufficient for supporting a PRTCSS power source?

Thanks,
Joe