The rolux rl-cagii battery holder is designed to power your canon eos c300 mark ii. you need to connect a v-mount battery (not included) to the rl-cagii to create a reliable solution. v-mount batteries are known for their long battery life, which allows you to get the most out of your rl-cagii. the v-mount batteries are secure in place, but they can be disassembled with one push on the button. Usage rl-cagii You mount the rl-cagii with a battery plate adapter on the rods your canon eos c300 mark ii. this adapter can be found under the optional accessories. preparations have already been made for both the rl-cagii and the battery plate adapter for quick and easy mounting. only one cable needs to be connected and you are ready to use. the rl-cagii is suitable for all common v-mount batteries. on the side of the rl-cagii is a d-tap connection, to power your favorite accessories (e.g. an led lamp).