Canon HF M31 - Manual (Page 21)

Preparations
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• To prevent equipment breakdowns and excessive heating, do not con-
nect the supplied compact power adapter to voltage converters for
overseas travels or special power sources such as those on aircraft and
ships, DC-AC inverters, etc.
NOTES
• The battery pack will be charged only when the camcorder is off.
• If remaining battery time is an issue, you can power the camcorder
using the compact power adapter so the battery pack will not be con-
sumed.
• Charged battery packs continue to discharge naturally. Therefore,
charge them on the day of use, or the day before, to ensure a full
charge.
• We recommend that you prepare battery packs to last 2 to 3 times
longer than you think you might need.