I have little idea, Tesla can make extra portable batery(low weight) which can be used in emergency like to have 3galon gas tank in the trunk.
Simply conecting in the trunk area one or two batery pack. To use extra power car will be in some software economy mode max 50mph no A/C no stereo (only Navi) which will give another 10 or 20miles extra.
To use the driver must stop the car and turn on some switch in the trunk are (to prevent using extra distance power during normal use) In some Gas stations later can be those batery pack for exchange or buy or rent).
Good to have one in the midle highway or forest road or trip to hospital with no power (or no time to charge) becouse there is no option to call friend and say Hey bring me el.power here
meaby if hi have el.generator, then can halp you...
If the Tesla car didnt think about it there is my idea... I see the document in TV on Nat.Geo chanel at Megafactories and i really like that car and later my friend told me tha his father allready pay downpayment for the S model whem visiting US Florida.
So dear TESLA if you like my idea you can give me thank you meaby this way ..one free car
With best regards Richard NOGA Czech Rep. (18.1.2013 at 8:05am) [email protected]