Originally Posted by MikeW9788

The best batteries to use in thus or any other transmitter are the Panasonic eneloops. Not the pro ones but the regular white ones. They rate much better than the pros. These are what all the pro photographers use in their flashes. There has been extensive testing on batteries to determine the best ones and the standard eneloops come out on top. They hold charge the longest, recycle the fastest, and can be recharged the most number of times. Real good prices on amazon with the great charger that comes with them. If you look into it these batteries are real impressive.camera flashes are high draw devices and their recycle time is directly related to the quality and type of battery you use.that is how I found out about them.