Yup, I have a couple of small, lightweight USB batteries, not much larger than a pair of AA batteries strapped together. Occasionally I'll fasten those to my helmet with a velcro strap or a couple of elastic ponytail doobies. Works fine.

But it compromises the weatherproof seal, so I don't use it if there's a hint of rain. To attach an external USB battery to the Ion Speed Pro it's necessary to remove the rear cap, which exposes the USB port, HDMI port, media card slot, etc., to rain.


Yeah, I get better results from my camera mounted to the handlebar, head tube or fork. There's some vibration that obscures the distant horizon but closer objects including cars and license plates are clear. The Ion Speed Pro mount is nothing special, a nylon clamp across the tubes and a nylon shoe that the camera clips into. It's not even the most rigid mount but it's still reasonably vibration free. It's only noticeable on chip seal and really rough gravel, like some utility easements. But most maintained gravel roads and MUPs are no problem.

But I like having the camera aimed wherever I'm looking, so I go for that compromise. Ideally I'd like cameras front and rear on the bike as well as the helmet. Not just for safety but to occasionally document group rides with friends for sharing on Facebook.