Definitely depends upon the cell and its Mah (milli amp) rating which ranges frequently from 2600 Mah to 3500 Mah in 18650 batteries. The higher capacity cells are more expensive, but in my experience well worth it. One trade off is that they wear out sooner, so I am told

Becoming available are 21700 batteries and associated lights which are rated at 5000 Mah.

For night excursions in tricky terrain, I like a lower power headlamp, coupled with a higher power hand held light for those interesting sections.

Basically you want rechargeable lithium ion batteries in a light with variable light levels, pretty common these days, but they ain't cheap!