Stormin Mormon wrote:

I like the batteries on back. Helps with balance,
I'd guess. I've never had a strap on head lamp
with batteries on the back.

I've got an older Black Diamond that uses 3 AA's in a battery box at the
back of your head. It can be awkward. My go to headlamp in a Tikka with the
AAA's contained in the lamp housing. It's lighter and handier.