Hi
@Terry Koontz
In general, the very highest mAh batteries are not the most powerful - they do not have the high amp capability some vapers need.
For example, the famous Panasonic 3,400 (claimed to be 6.8 amp) was indeed a long lasting battery but considered not really suitable for vaping. I used them, as did many others though without incident a few years ago and could still use one now for gentle vaping.
These days, there are a lot of batteries in the 2,000/2,500/3,000 range which are all good for medium power vaping. Doubled up, even better! Hard to go wrong with a 20 amp battery with either 2,500 or 3,000.
So, when you see 1,500 mAh / 30a - it's not really for 'us' that use regular power.
Samsung 30Q and LG HG2 are both good compromise batteries.
Lower ohms means more vape, yes. Really low ohms means you must choose a 20a battery at least.
If you are going to get 20a, then may as well shoot for 3,000mAh.
There is a Panasonic/Sanyo with only 10a but 3,300 - but I've never seen it for real.