Looking for battery dremel

[Flask]

Is a Battery operated Dermal strong enough to use for modifying a Gold Dollar?
If so, any chance of recommending a model?
Thanks, I do have an electric dermal but would like something a bit more "handy, portable".

 

[Gamma]

I have a cordless Milwaukee 'dremel' clone. Works well. Seems to have same rpm and torque like my AC-powered Dremel.
Not sure if the battery would hold out for a full rework of a GD - prob best to get a backup.

 

[SteveWY]

I had a small cordless, rechargeable Dremel years ago but it gave up the ghost. I wish I could have replaced the battery. It didn't have the power of an AC tool but it was handy for small projects.