franzbassist

One is to charge it with the supplied 10v power supply, the other is for an optional power supply such as an in-car charger. It also charges via USB

I love mine but I also have problems with the rechargeable battery. I only get around 45mins. Seems like it only needs about 20mins to charge before the green light goes out. Tried both 10v and usb.

re your question about charging, the green light goes out after 30 mins or so. This is a fast charge only and  will give you the 45mins or so that you are getting. A full charge with the charger takes about 10 hours according to Ashdown. Hope that helps.