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Im using the pill it comes with, Also its a LiFePO battery because its rechargeable, if a lithium ion battery hits 0% its dead. Or so I have heard.
With that 520nm diode it is impossible to come close to fully draining your Li-Ion batteries, it can't come close to using the full capacity of the batteries before it stops working. That diode needs 5.8V just to reach its lasing threshold (about 15mW), and about 6.7-6.8V for full power. There is also a small voltage drop accross the driver, so you get short battery life to begin with. You have to use the 3.7V batteries that charge to 4.2V when fully charged, otherwise you will get reduced power and it won't work for more than several minutes if even that long. Be sure your batteries are fully charged before use, they normally ship uncharged. The one I have uses a micro boost driver and runs on one 18650, it starts flashing when the battery gets too low, the SL drivers won't flash though, you will simply notice a power drop well before it stops working.
Alan