However, for club racers , where cars aren't inspected , but everyone is kinda running the same thing, it could be a problem.
Even with normal batteries it is know that if there is no controll they will be overcharged.The safe limit with normal LiPo is 4.235v per cel and believe me, they do it.....
In the attach a picture I shot at an ETS race where 8.40 max is allowed.
I do not know if it is true but I was told the HV LiPo when charged at 8.40v will keep longer a high voltage.