HP 15c Collector's Edition save/restore does not work

[Johnh]

(Yesterday 08:25 PM)ajay_m Wrote:  I can confirm on my CE device that with batteries removed, a DVM reads 0 ohms between the two negative terminals and 0 ohms between the two positive terminals, so if this is not the case on any unit, there is a wiring fault.

Thanks, that's good info. Mine had no negative to negative continuity. I fixed it with my own work-around wire in the battery area rather than return it or hack it open. Your post also confirms that no blocking diodes are included, which is totally fine, but I had wondered about that while diagnosing.