Two batteries using the same technology but with different mAh ratings ... the main difference will be longer life between charges. Put another way, after some period of time the one with the higher mAh rating will have a higher voltage remaining, on and off load.
There IS a performance increase in the higher mAh rated battery from the very first second; how much depends on the ratings - one would not tell much much of a difference between 1000mAh and 2000mAh but between 100mAh and 200mAh it would be noticeable. The reason is internal resistance. For a given range of batteries (same technology inside), bigger capacity will imply lower internal resistance meaning lower voltage drop under load and more current (hence more power).
In brief, a higher mAh battery will give longer life, better performance for longer and slightly better performance from the very first vape.
(There are some lithium batteries with high mAh designed for backup power that use a different chemistry and cannot supply a high current. These aside, there is a small advantage in power from the very beginning with a higher capacity battery, though it is over time that the slower decline in charge means that the performance difference becomes greater.)
There IS a performance increase in the higher mAh rated battery from the very first second; how much depends on the ratings - one would not tell much much of a difference between 1000mAh and 2000mAh but between 100mAh and 200mAh it would be noticeable. The reason is internal resistance. For a given range of batteries (same technology inside), bigger capacity will imply lower internal resistance meaning lower voltage drop under load and more current (hence more power).
In brief, a higher mAh battery will give longer life, better performance for longer and slightly better performance from the very first vape.
(There are some lithium batteries with high mAh designed for backup power that use a different chemistry and cannot supply a high current. These aside, there is a small advantage in power from the very beginning with a higher capacity battery, though it is over time that the slower decline in charge means that the performance difference becomes greater.)
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