The EOS R3 uses the same high-capacity lithium-ion battery LP-E19 ( 10.8V / 2700mAh ) as the EOS-1D X Mark III , capable of firing up to 860 shots * on a single charge . In situations where you run out of battery and charging the battery is not possible , simply power up with a power bank that supports Power Delivery through the EOS R3 ' s USB-C port ** as an alternative power delivery method .
* Using LCD screen at room temperature ( 23 ° C / 73 ° F ) with Power Saving mode . ** A compatible USB-C to USB-C cable is required .
Illuminated Buttons
Similar to the EOS-1D X Mark III , the EOS R3 features the same illuminated buttons that allow for much easier menu selection and playback operations when shooting in dark conditions .