1. In some cases the battery may not be charged through the BG-E22 when using the PD-E1 USB power adapter depending on the condition of the battery being used.
The firmware update can be downloaded free of charge from the Canon website.
Firmware Version 1.0.1 is for battery grips with firmware Version 1.0.0. If the battery grip's firmware is already Version 1.0.1, it is not necessary to update the firmware.
When updating the firmware of the battery grip, please review the instructions thoroughly before you download the firmware.