Canon DC 40 User Manual
Page 23
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We recommend charging the battery pack in temperatures between 10 °C and
30 °C (50 °F and 86 °F). Outside the temperature range of 0 °C to 40 °C (32 °F
to 104 °F), the charging will not start.
If you connect a faulty power adapter or battery pack, the CHARGE indicator
flashes rapidly (approx. twice per second) and the charging stops.
The CHARGE indicator also serves as a rough estimate of the battery charge
status.
Continuously on: Battery fully charged.
Flashes rapidly (approx. twice per second): Battery over 50% charged.
Flashes slowly (approx. once per second): Battery less than 50% charged.
We recommend that you prepare battery packs 2 to 3 times longer than you
think you might need.
The charging time will vary depending on the surrounding temperature and the
battery pack’s initial charge condition.
In cold surroundings the usable time of the battery pack will decrease.