Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 45)

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Charging the Battery
Charge Level
Charge Lamp
Color Display
0–49%
Orange
Blinks once per second
50–74% Blinks twice per second
75% or higher
Blinks three times per
second
Fully charged Green Turned on
 It takes approx. 2 hr. and 30 min. to fully recharge a completely
exhausted battery at room temperature (23°C / 73°F).
The time
required to charge the battery will vary greatly depending on the ambient
temperature and the battery’s remaining capacity.

For safety reasons, charging in low temperatures (5–10°C / 41–50°F) will
take longer (up to approx. 4 hr.).