Can you recommend any brands/flavors that actually taste like cigarettes?
Chasing the flavor of your brand of cigarettes can be very frustrating. I found one that reminds me of camel from a local vender, but I'm sure it wouldn't suit someone who is smoking camels now.
My recommendation is to pick flavors that sound appealing to you (fruits, deserts, flavored tobaccos, etc) but don't drive your self crazy looking for the flavor of your brand. Besides, half of the advantage to vaping is not always smelling like cigarettes!

There are some great tobacco flavors out there that taste like some pipe tobacco smells (never smoked pipe tobacco). Also some good cigar flavors. I stuck to tobaccos my first 6 months, but now I'm mostly a mint vapor (wasn't a big menthol fan when I was a smoker, but a few times I quit Altoids where my replacement for cigarettes... obviously it didn't work too well... the few times I quit... lol)
Your best bet is to go sampling at local shops, provided there are any in your area.
better battery?
The best for new vapors (IMO) is an iStick (I think the 30w are out which the build quality has improved from the 20w) or the MVP20w. Both are great powerful "Advanced Personal Vaporizers" (APVs) that will make your vaping much more enjoyable. Most that upgrade from Ego agree that there is a night and day difference (for the better) between Egos and APVs. It is a big bigger of a device and doesn't resemble any tobacco products (ego's remind me of a long skinny cigar). Generally they last most users all day, and you can vape while you charge if the battery gets low. They accept android phone charge cables so you can just use your cellphone charger to charge it (less cables running around if you have android devices, and great that you can top off the charge in the car or at the computer).
A nautilus tank is a highly regarded tank as well, but be sure and get the BVC coils for it, which is really what makes it shine. It does well on the 20w box mods, though some like to push it slightly above 20w, so the 30w may make sense.
Check youtube for reviews on products before you buy. It will show you the ins and outs, and give you some opinions on what experienced users like/dislike about the products.
101vape is usually my goto site because they have some of the best prices and ship from the US.
Welcome to the Forum!