Is it possible to get too big of a battery? Im still not entirely sure what mAh refers to as ive only had the one generic that i have. Also, how long do the batteries tend to last b4 completely giving out? I've had this same one for a couple months now and idk wat id do if i woke up to a non-functioning battery.
Too big a battery is only a problem if you think it's too big to be carrying around. mAh is just a measurement of how much electricity the battery holds. If you can go a day on a 650 mAh battery, you can go 2 on a 1300 mAh one.
How long a battery lasts is pretty up in the air. Theoretically, an Ego quality battery should last hundreds of charges. I've had Ego batteries die within days of getting them. On the other hand, I've had a Riva battery that I bought as a backup about 2 months after I joined this forum and used it daily for a couple of years and it still works just like new. It's only in my backup box now because it looks like crap (serously, I've rubbed the half the finish off the thing from handling). It's been a tank.
I'd highly, highly, highly recommend buying several (as in, at least 3 or 4) spare batteries. There's nothing that'll make you run back to cigarettes faster than suddenly finding yourself completely unable to vape and knowing it'll be days for a replacement to show up.
As for your original question, if learning how to draw hasn't completely fixed the problem, you might consider using a couple of batteries with cartos on them simultaneously. Use one for a few minutes then let it sit as you use the other. Switching between the 2 will give your juice more time to thoroughly wick.