Seems to be C-rate[1], a unit specifically for battery discharge rate. Funny enough, the wiki article does mention disambiguation between it and Coulombs. [1]

Seems to be C-rate[1], a unit specifically for battery discharge rate. Funny enough, the wiki article does mention disambiguation between it and Coulombs. [1] https://en.wikipedia.org/wiki/Battery_(electricity)#C_rate https://en.wikipedia.org/wiki/Battery_(electricity)#C_rate