Mooch confirms this Molicel P42A 21700 in his testing is safe to say this is the best of all 21700 for regulated mods running between 40-90W.
Nominal Capacity: 4200mAh
Nominal Voltage: 3.6V
Maximum Voltage: 4.2V
Discharge Current: 35A
Maximum Continuous Style: Flat Top
Approximate Dimensions: 21.7mm x 70.2mm
Approximate Weight: 70g