Battery Life

[cperry]

I have a Durango 410v3, with speed passion 5.5t motor and speed controller combo and Team Orion 5500ma 90C batteries.

Two of the four batteries just lasted 9 mins but the other two lasted 6 mins.

First question is, why the difference, secondly is 6-9mins about right for battery life?

Voltage protection is on a 3.2v (as per battery instructions) all batteries were fully charged, ALL parts are less than 3 months old.