Batteries are good for roughly 500 charge cycles (drained and charged.) Depending on how much you use them they should be replaced according to that. Every 4-6 months is a good rule of thumb for most people.
Not sure but if you call they are good people. Talk to Courtney very knowledgeable.
Not sure on exactly how often should replace them. I have like 6 sets i rotate though some i have had for 6 months to a year that i can see needs replacing. You can ask Netvapes for the higher capacity batteries and they last me a day and a half to almost two days
I replace my 1 battery every 6 months. It helps to turn it off when charging.
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