look for Joye 510 batts for guaranteed quality first of all.
Low resistance is for 3.7 volt devices high resistance is for 6 volt. the lowest resistance you can uses on a 510 batt is 2Ω.lower will kill your batt unless you go to 450 mah or higher.
Resistance effects the flow of power threw the heating element in your atty/carto. by adjusting the the resistance you adjust the wattage. 6-9 wats I find tend to be the "goldilocks zone" not too hot not to cool. too cool, not enough vapor,flavor,throat hit. too hot, just a bunch of burned nastyness.
A good formula to use to find what resistance is good for your unit it Volt x Volt / oHm.
Example: For a 510 with 2Ω atty/carto it would work out 3.7v x 3.7 v = 13.69 / 2Ω = 6.8 watts.
keep in mind the lower the resistance the faster the drain on the battery you may want to think about a battery with a bigger capacity (maH) like an eGo style unit or a PCC to charge your 510 on the go.
If you want to stick with 510 stay between 2Ω-2.5Ω. 2.5 attys are what most 510's come with.Boge 2.0 cartomizers are my personal favorite for 510.
Hope this helps. Happy vaping!!