Using a sp2610 for the road & also on foot, it can be done!
I use a 12 volt 7 amp. battery in a holder that attaches to my belt, it was used for a camcorder light before. It works, but is heavy & I am looking for a more portable unit. Maybe a 76S for me.
Holding the weighted bean-bag mount in one hand & the battery on my hip tends to slow me down a bit.
If I change the voice directions to German it really scares the heck out of the wildlife in the area.