Here's a comprehensive list:
1ea, SF123A 3-volt Surefire lithium battery:
http://www.armyproperty.com/nsn/6135-01-417-95671ea, SF223A 6-volt Surefire lithium battery:
www.armyproperty.com/nsn/6135-01-503-161612-Pack, 123A 3-volt lithium batteries (multiple brands available):
http://www.armyproperty.com/nsn/6135-01-351-113112-Pack, SF123A 3-volt Surefire lithium batteries:
http://www.armyproperty.com/nsn/6135-01-554-086472-Pack, SF123A 3-volt Surefire lithium batteries:
http://www.armyproperty.com/nsn/6135-01-522-6679