Truggy & buggy same batts?

[superek4]

I am using 6s 3000 for truggy. My truggy is running Neu 1515/3d 1350kv. My buggy is using 2050kv neu & 4s 5000mah. I was thinking to switch to tekin 1550kv & 6s 3000mah batt?

I know more volt is good. But my races are 7-8mins only.

Using 6s 3000Mah can save cost also as both my cars can use the same batt.

btw 6s 3000 is 585g the weight of 4s 5000mah is 610g

4s 3000mah is 415g

so I m deciding weight vs volt & cost saving.

What you guys think?