system
Given the following post, respond as if you're commenting on Reddit:
human
[Dragon Ball Z] Why didn’t Cell ever use the Kaioken when he was losing a fight?

He should be able to, more than Goku even, because of how durable his body is and how he never runs out of energy. If he did that, he would have won damn near every fight he was in.
gpt
Does cell know about kaioken? 

If he does, it may be a technique that requires proper training under a teacher compared to something like the kamehameha, which seems be learnable by seeing it in person.