# Why can't you rent towable aux batteries for electric cars?

**URL:** <https://boards.straightdope.com/t/why-cant-you-rent-towable-aux-batteries-for-electric-cars/953519>\
**Category:** In My Humble Opinion\
**Created:** [October 30, 2021, 1:47pm UTC](https://boards.straightdope.com/t/why-cant-you-rent-towable-aux-batteries-for-electric-cars/953519 "2021-10-30T13:47:50Z")\
**Posts on this page:** 1\
**Showing post:** 8

<div class="post-metadata">

**Author:** ![Heracles](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/heracles/32/487_2.png) [@Heracles](https://boards.straightdope.com/u/Heracles)\
**Post date:** [October 30, 2021, 6:14pm UTC](https://boards.straightdope.com/t/why-cant-you-rent-towable-aux-batteries-for-electric-cars/953519/8 "2021-10-30T18:14:03Z")

</div>

> [@Capn\_Carl](#):
>
> The trip to California is 40 minutes longer because it requires 3 stops of 20 minutes.

For more details on the math, please see the [recent thread on relativity](https://boards.straightdope.com/t/can-one-theoretically-travel-faster-than-light-relativistically/950057/8). 🙂

ETA: OK, I just re-read your text, I had missed this part about the ICE:

> [@](#):
>
> On the upside, the trip to CA is faster, because there’s just 2 10-minute stops.

---

_[View the full topic](https://boards.straightdope.com/t/why-cant-you-rent-towable-aux-batteries-for-electric-cars/953519)._