Ghost XL Pro

I use this one as well and I'd recommend it. If you're recording to use the footage in vlogs or something like that then the quality isn't going to be good enough but for a dash cam it's perfect. Really good battery life.

Drift ghost pro xl. Battery life is pretty good lasting 6-10 hours depending on setting. I get roughly 8 but hard to say as i charge my helmet and camera when my helmet low battery.

I’m currently using a Drift Ghost XL Pro on my helmet, not the best out there but certainly does the job.

https://preview.redd.it/az2s2t159u0g1.jpeg?width=3024&format=pjpg&auto=webp&s=c80dfee3ea06fd2aab4468e4de0ba1f2b0fa5d4f Drift ghost pro XL Not to bulky, sits at the side of the helmet rather than at the chin. Films in 2.7k & 4k as well as 1080p all at 60fps or less if needed. Long battery life that’ll last a days ride

Your one would be the ghost series by drift innovations. Best standalone for this use case. Works like a dash cam, mounts well and good battery life.

Drift Ghost of AliExpress will be about $100. 6 hour battery at 1080p, dashcam mode, and an app that allows you to download videos over the air at the side of the road. A bit clunky to mount to a helmet, but I have a seatpost mounted rear facing one, and one on the GoPro adapter under my out-front Garmin mount. It's been enough to get a few positive outcomes from UK police.