Normally full charge is 4.2 VPC
(Volts per cell)
On high volt it’s 4.35 VPC (or more)
Generally HV are used in whoops for a bit of punch/runtime.
They can technically be used in anything as long as it doesn’t over volt any components.
The small increase in voltage from HV isn’t really worth the worry if you’re unsure. As we are talking about a few extra seconds of run time and or a few % more in power output during the first few seconds of plugging in.
I hope that helps. Keep rippin