J Lachowski,
If You use ~5000 mAh Lipo and need rather light LiPos there is a new Hacker TopFuel 5100 mAh 20C 5S Competition F3A 2018:
https://www.hacker-motor-shop.com/Battery-pack-and-Accessories/TopFuel-F3A.htm?shop=hacker_e&SessionId=&a=catalog&p=10784
About 1096 gram for 10 cell pack.
I use myself the smaller version of this Competition F3A LiPo, the 4600 mAh (10 cell pack is between 989-992 gram).
/Bo