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.)?

  • 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). – Itai Mar 28 '11 at 2:29
  • 1
    We're talking like 5+ years. – Alan Mar 28 '11 at 23:19


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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