NL1835HP (18650 - 3500mAh - 8A)
Expensive but long lasting if charged with Nite Core Chargers.I owned old Nitecore batteries with similar specs about 2+ yrs and still keeps good charge.Highly recommended for long term professional use.
To sum it up, Nitecore battery does not dissapoint you in any situation!
Actually, i really do not have a chance to use it yet , still, i think that i did right purchase.