G603 wireless gaming mouse delivers up to 500 hours on 2 AA batteries—twice as long as our previous generation. Even with a single battery the G603 can last through up to 500 matches of League of Legends®. You can also choose which side to place a single battery with no impact to performance for custom balancing. When battery is at 15%, both LED status indicator and Logitech G HUB will notify you before the critical moment.