Canon EOS R, Advanced User'S Manual

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577
Charging a Battery in the Camera
o
If the access lamp does not light up, try unplugging the USB power
adapter and plugging it in again.
o
The charging time required and the amount charged vary depending on
ambient temperature and remaining capacity.
o
If the battery’s remaining capacity (p.387) is approx. 90% or higher, the
battery will not be recharged.
o
For safety reasons, recharging in low temperatures (5‒10°C / 41‒50°F)
will take longer.
o
Batteries are not charged when the camera is connected via Wi-Fi or
when the card slot cover is open.