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I have a problem with my Nikon D7100: it does not keep the chosen settings over time. For example, if I set the settings to take a picture at ISO 500 and after a series of shots it goes to ISO 1000. Or I set it to take the shot only in jpg and it reconfigures to take the shot in RAW.

The same thing happens to me with the menu settings; for example, if I set the internal brightness of the camera to +3, turn the camera off, turn it back on and it is +4 as it came from the factory.

What could be causing this - is it possible that it is a problem of some internal battery?

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Do you leave the main battery in, with a decent amount of charge left, when the camera is not in use?

I don't think these cameras have the equivalent of a CMOS battery which may fade over time, but I think they do use a capacitor to hold a small charge covering such as battery removal, or leaving perhaps a day or three without a battery, without losing internal settings.

There's a chance after 10 years any capacitor may itself be losing capacity, but keeping a reasonably-charged main battery in it ought to overcome that.
I've never left mine more than a few minutes without the main removable battery in it, so I don't know how long it would be expected to retain settings without one.

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    \$\begingroup\$ According to Nikon manual this power source can keep the info for 3 months (page 29) download.nikonimglib.com/archive2/Wt74B00WmPdp01GF7sU080xUqy56/… \$\endgroup\$ Commented Feb 17, 2023 at 17:34
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    \$\begingroup\$ @RomeoNinov - good find, thanks - so basically 'capacitor/rechargeable battery-style' however executed physically. After 10 years it could be getting very weak. \$\endgroup\$
    – Tetsujin
    Commented Feb 17, 2023 at 17:36
  • \$\begingroup\$ 10 years is very huge period, internal self-discharge (AFAIK) work on exponential function so.... :) \$\endgroup\$ Commented Feb 17, 2023 at 17:41

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