[Who's Using What? Lithium Ion.]

Samsung put up their li-ion cell website. Also took apart the Bosch 10.8 battery, uses Samsung 13650-13P.

13Q and 13P are identical except the max discharge rate, both are 1.3 Ah @ 260 mA discharge. 13P is 10 Amps and 13Q is 18A. So all the 18v 2.6 Ah Bosch/Milwaukee/Ryobi etc stuff should have about the same torque at equal RPM. Milwaukee might be weaker because they use shit motors.

[Who's Using What? Lithium Ion.]

some do, some don't, what difference does it make? They can be serial number, QA person id or timestamps. They are all from the same batch, as capacity varies from batch to batch and manufacturers try to match the cells as close as possible.