Battery life with compute modules

I was wondering what the battery life is on a reform with the raspberry pi CM4 module? My reason is that I am curious how much battery life a Raspberry Pi 5 compute module would possibly get in comparison in the reform.

According to pcmag’s testing, the Raspberry Pi 4 SBC (not compute module) draws up to around 6.5 Watts, whereas the Raspberry Pi 5 draws up to around 8.5 Watts. The compute modules perhaps draw less, but I don’t know.