The Photoolex 1300 mWh batteries also have small print on them saying
.
"Rated capacity: 780 mAh"
"Rated Energy: 1170 mWh".
.
Being generous that might be a guaranteed minimum, or maybe "1300 mWh" is a lie.
I've set the Cherrybomb on full beam with a freshly charged set, in theory it should last around 49h if it's 1300mWh.