Do you want to extend your flight times, learn how batteries work and make one yourself?
Watch this two part video get any confusion out of the way and you should be up and running in no time!

Still not conviced and want lipos instead, great no problem check these ones I used before:
https://hobbyking.com/en_us/customer/...

Product links
Batteries: https://www.banggood.com/custlink/vD3...

Battery Spot Welder: https://www.banggood.com/custlink/KmK...

Nickell Ribbon Strip: https://www.banggood.com/custlink/3KG...

Glue Gun: https://www.banggood.com/custlink/GDK... or https://www.banggood.com/custlink/v3G...

Kitchen Scale: https://www.banggood.com/custlink/3mD...

Balance Cable: https://www.banggood.com/custlink/mvD...

XT60 w/Cable: https://www.banggood.com/custlink/mvm...

Soldering Iron: https://www.banggood.com/custlink/Gvv... or https://www.banggood.com/custlink/v3G...

Solder Wire: https://www.banggood.com/custlink/Dm3...

Other useful accessories: https://www.banggood.com/custlink/DGK...
https://www.banggood.com/custlink/G3v...
https://www.banggood.com/custlink/KGK...