The following article will explain what the expected battery life is for V3, G3 and V2.
V3 and G3
The watch will last approximately 8-10 hours on a single charge. This can vary from user to user based on their behavior (amount of swings and shots for example) when using one of the tracking modes.
Between charges, your V2 should have approximately 5-6 hours of battery life. This will depend on which mode your V2 is used in and total number of swings. We recommend charging your V2 fully before your first round and after every round you play to ensure optimum battery power. To fully charge your V2 please allow up to five hours charging time.