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I have replied on different posts and thought it might be good idea to have a centralised place to put all info on how to read CAN bus from an Arduino UNO.
The advantage of Arduino UNO + CAN BUS MCP2515 is that it's very cheap, you can get all components
for around 10$ if not less...
Here http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries we can read that "every 0.10V drop below 4.20V/cell doubles the cycle" (I don't know whether that is a fact or not..). Do we know what Model S charge voltage at 100% charge is?