Stewart Golf X3R Battery Your X3 is guaranteed to complete the toughest 18 holes, and in many cases will complete 27 holes or more. However if you regularly play more than 18 holes in one day then we recommend that you also purchase an additional battery pack. Then all you will need to do is swap them over at the break and you will have plenty of power - so all you need to worry about is your game. The additional battery pack is supplied complete with terminals and carry strap.