Originally Posted by
chasmm
One of the complaints about the 500 particularly by long distance riders is that you cannot charge and use it at the same time. The Edge 800 is supposed to be able to work around this by using the official Garmin external battery pack, but I don't know if anyone has actually verified this yet.
With my 705 I use a battery designed for charging USB devices and can use the Garmin when charging so I assume this will work with the 800 as well. This is great for brevets when you are riding through the night with the back light on.