well as far as dry burning I don't think ecig type
batteries are really the best choice for doing this, though higher mah
batteries like the ego may work I feel the circuitry in them could falter in time.
bullet proof suggestions are also impossible when it comes to electronics, but you would have better luck with a circuit-less mod that can handle a batter like the 18650 since the mah is at a rate of at least 2400mah.
the reason I suggest that is because you are less likely to drain the battery out during the dry burn process and these batteries can "handle" it better then its lower mah brothers.
a 14500 battery mod would be the lowest mah battery that IMO would use. The AW High Drain batteries would be even a better choice.
Note: keep in mind batteries are being worked hard in general during basic use of PV's/ecigs so the risk of early battery life is ALWAYS there dry burning or not.
LGD