You might want to consider getting a 510 threaded battery. That's the predominant thread size for most of your attys/cartos/clearos found in the market.. You DONT have to use 510, just sayin you'll have more options that way.. adapters can always be gotten for other sizes if needed.
And yet the 901 (808 compatible) attys are considered one of the best. Go figure.
The OP stated they were using 901's with 808's and asked only about resistance. I don't get this need some ppl have to convert everyone to 510.
No bias here. I'm using 901 attys on a 510 ego with an adapter.
To the OP: generally its accepted that low res (<2ohms) should not be used on batteries below 400mah as it can reduce the life of your battery.
I happily dripped using 2.5ohm attys on a 3.7 volt 380mah 808 M3 battery (is this what you have?) for months and months. I recently tried 2ohm attys and love them to death. I did, however, pop one while driving it too hard. I'd never popped a 2.5ohm atty.
I personally, don't need anything below 2ohms on a 3.7 volt battery. 1.8ohms I get a burnt taste.
If you're not sure, get one of each. 901 attys from health cabin are inexpensive enough to do it. Just be aware that 1.5ohms might damage your battery.
