I was using this Cree light setup:
and got 5 commutes out of it. I am not sure what happened but during recharging after the 5th commute both the charger and the battery died. I like light and would like to replace both the battery and the 8.4 V 6400 mAh lithium battery pack. I am soliciting recommendations for this. So far this is what I have found.
For the battery apparently this fits the plug on the light well.
This is what I found for a charger.
Any other thoughts?