I just doubled checked the charger it is 4.2V rated.
I will have to double check on the batteries.
I will have to double check on the batteries.
I'm curious about the battery voltage itself, before any VV technology occurs. The reason being that operating a device at a higher voltage than the battery produces introduces a certain level on inefficiency which will reduce the useable time available from each charge. Operating at a lower voltage is pretty efficient and doesn't have the same "overhead" that higher voltages require.