IT’S AN AWESOME TOOL. IT’S AS EASY AS CONNECTING IT TO THE MYCHRON 4 AND JUST DRIVING AROUND. THEN YOU DOWNLOAD IT (NEED THE KEY) AND CAN REVIEW ALL SORTS OF DATA (YOUR DRIVING LINE, LATERAL ACCELERATION, ETC.)
A single 9V will last for a day or two of driving. So $2 a day to use it. There are hooks on the extension box that comes with it to put in a larger battery, but so far I’ve not found replacing the battery to be that big of a deal.
Battery: as Ray said.. not a big deal. One 9V lasts me around 9-12 sessions. I used one batterty for the first 3 days of Supernats, one for the last 2 just to be safe :)
It is a fantastic tool for helping to improve your driving and setup of the chassis. Works really well if you have team mates you can share data with to compare against.
Plan on 1 new 9V battery per race weekend. We have found the Werker batteries to hold up the best for power and vibration.
The lithium 9V batteries last a lot longer than alkaline.
I use a pack of 6 AA lithium batteries taped up behind the nassau and connected to those leads and rarely need to think about batteries anymore. <shrug>