Even more options
Originally when the Hammer was released, we had the option of running three different batteries, however it only seemed that when wanting to run a single battery only the 20700 was the allowable option. Not anymore, with this 7mm puck now available, we now can enjoy the option of running a single 20650 battery. Definitely worth it in my opinion.
Reviewed by: (Verified Buyer) William Carman from Oklahoma.