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If I remove the rechargeable BP battery from my Canon EOS 50D for an extended period of time, will the internal lithium battery preserve all of my settings (including custom functions, date/time, etc.)?

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  • \$\begingroup\$ You'd should qualify 'extended'. Months, no problem. Years, will be because the internal rechargeable battery eventually runs out (even if on some high-end models it is replaceable). \$\endgroup\$
    – Itai
    Mar 28, 2011 at 2:29
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    \$\begingroup\$ We're talking like 5+ years. \$\endgroup\$
    – Alan
    Mar 28, 2011 at 23:19

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Yes.

All modern canon dslr's have a small lithium battery (similar to the one that is used to power your computers CMOS) that powers the internal memory that retains the settings.

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