Sure, they would work but it's one more thing to have to charge. My drill batteries are always charged and I already own them.

> On Oct 1, 2016, at 9:40 AM, James A. Robinson <jim.robinson@gmail.com> wrote:
> 
> Honestly I had been assuming one of those usb battery packs would work. :)
> 
> On Sat, Oct 1, 2016 at 4:59 AM Chris McGee <sirnewton_01@yahoo.ca> wrote:
> I found some $4 voltage regulators that will convert 18v Lithium ion drill batteries to power my Pi. Could be useful for field work.