That is the newer AceWell speedo. I don't think this one has a battery.
It gets it's power from the motorcycle or from an add-on 9V battery.
This this post for a discussion on how to attach the add-on 9V battery.
http://www.gasgasrider.org/forum/showthread.php?t=2812
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This is the type of speedo I was talking about with the other type
of batteries mounted in the back.
The top one is the older style from around 2002. The lower one came with,
(I beleive) the 2003-2006 models. Please correct me if I am wrong.
I was asking in that earlier post how to hook up the newer, 2002, to a wiring
harness set up for the older round gage style. I never got an answer.
I now have a fancy clock on my EC300 with no other functions.
I did pick up one of the newer AceWell gages a couple months ago. I may
try and mount that one and see if I can get it to work.
Best of luck, Jeff