Before use, make sure the following items are included in the package. If anything is missing, contact your camera retailer. Camera Battery Pack NB-6LH* Battery Charger CB-2LY/CB-2LYE Neck Strap Lens Cap (with cord) * Do not peel off the adhesive covering from a battery pack. Printed matter is also included. A memory card is not included (=2). Compatibility. The Digipower RF-TC-55C digital camera battery charger is the ideal companion when traveling. Recharge your compatible Canon battery with this universal portable charger when you are at home or on the road. The TC-55's innovative design eliminates worries about compatibility, allows you to charge an additional USB devi.
Before anything, first, check that the charger is unplugged. Now remove the battery cables by removing the negative cable first. Connect the positive charger cable to the positive battery terminal and the negative to the negative terminal. Select a charge setting (low or high). Leave the charger and cables while the battery is charging.

1. Just checked my R5 & grip with the official Canon charger (have Canon R and grip as well so already have this charger and when I plug it in to the camera with the grip attached the charging lights illuminate (one at a time like on R). So plug it in to camera USB port. Check the charger you are using is PD compatible as I know with the R it

Thus you need about double the battery pack in mAh on a battery pack to equal the same mAh on a Canon battery. Quoting from Wing2 in that thread. The key PD spec. to watch for is the 9V must be 3A or higher and 5V must be 3A or higher)
Follow the steps as stated below: Placing battery inside the camera. Turning the camera power off. Connect the given power cord – USB cable, to the camera. Attach the power bank with the other end of the USB cable. You may know the charging percentage following the battery icon on the LCD window.
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how to use canon battery charger