Yes, you can use it directly but 700 mAH capacity isn't much for a bike light. I have a $5 100 lumen bike tail light that has a 650 mAH internal lithium polymer battery and my Blitzu Gator 300 lumen front light has a 1200 mAh battery. I took it apart to see what was inside so I know that value is correct. It was a Christmas gift I will never use so I wasn't worried about destroying it (which didn't happen). I prefer a simple XML-T6 focusable flashlight powered by a Panasonic 3400 mAH 18650 battery. It's brighter than the Gator and simple to switch out the battery should it get dim during a ride.