Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - Page 53

3. Charge the battery. Slide the battery in (in the opposite direction from protective cover removal) and make sure it is securely attached to the charger. You can load a battery into either slot or slot . Charging begins, and the charge lamp blinks or lights up in green. Charging is finished when all three charge lamps (50%/80%/100%) are lit in green. Charging takes approx. 2 hr. and 50 min. at room temperature (23°C/73°F) per depleted battery. 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. 5 hr.). Caution Use Battery Charger LC-E19 to charge Battery Pack LP-E19 (both included). This battery cannot be charged with Battery Charger LC-E4N/LC-E4. Depending on the condition of the battery, charging to 100% capacity may not be possible. Note If you load two batteries, they are charged one after another in the order you load them. Upon purchase, the battery is not fully charged. Charge the battery before use. 53