for use in what? i dont know the amp ratings on these but thats what is important for regulated devices. for a dna30 as an example it has a 10 amp limit (0.3 ohm [lowest resistance] at 30 watts [highest wattage] is 10 amps) so anything with at least 10 amp continuous will keep you safe especially if you arent running 0.3 at 30w. with mech mods you need to use high drain IMR batteries like samsung 25r or the purple efest 35amp, no exceptions since there is no built in safety