New vv/vw device user need some advice

[damnworld]

Hi there vapers...just got my new itaste svd..i'm loving it so much i can't put it down...

But i need some help with the battery & charger..the batt that came with it is a trustfire 18650 3.7v 3000mah li-ion...is it suitable for this device as its get abit warm as i vape...or is it normal....
& the charger is a no brand low quality feel charger..is it safe to use that? If possible i hope i can get some recommendations for a better quality batteries & charger suitable for my svd... Thx in advance guys

 

[damnworld]

Forgot to add that its a flat top batt...& what are the difference between flat & button top except for the looks of it..thx