Towing an extra battery pack for plug ins extended range

[TXwaterdog]

So, Electric vehicles are basically all torque. I'm wondering instead of getting range anxiety why not just have a towable extended range battery pack?

Those of you who are electrical engineers might be able to answer the question of a Tank 2 switchable system like the old trucks... what system surges should be worried about? Can a parallel system teaming the two battery packs together be a useful system? What suggestions do you have for such a system.

[Daox]

Its been talked about many times. Some people with EVs have done it. Its not a bad idea.

[TXwaterdog]

Originally Posted by Daox

Its been talked about many times. Some people with EVs have done it. Its not a bad idea.

Perhaps when people start replacing battery packs they can use the old one for this type of backup range extender.

[Ryland]

I've thought about building one with my spare pack from my EV but range anxiety is something you get before you buy the car, not after you've owned it, unless you can't do math and bought a vehicle that doesn't fit your needs.
If you have two packs you want to use them both at the same time because you will get more range out of them as you discharge them both slower.
If you look at Steve Hawkins' RXT-B (range extending trailer) you will see a battery trailer that is adding about 55 miles of range, the guy says he's increased his range from 80 to 135 miles by adding more or less an identical pack to what the vehicle that is towing it is using.