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Toyota Rav4 EV - Extending Range

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I saw postings around attempting to build a new battery pack to extend the range of a Rav4 EV. Has anyone attempted or done it using used Tesla battery packs? Or is there another less time consuming way to try this? I am not an electrician or electrical engineer. Just really like the vehicle, its capacity, etc.

Also Toyota strongly recommends not using the Rav4 EV to tow a trailer, etc. They warn it would void the warranty, but with the exception of the battery itself. So what are the consequences and why?