system
Given the following post, respond as if you're commenting on Reddit:
human
Why isn’t interchangeable batteries a thing for electric cars?

The biggest complaint I hear about electric cars is the charge times. I always wondered why something like an exchange system for propane tanks, but for batteries doesn’t exist when it could be as fast as filling your car with gas. Biggest reason I can think of is weight, but that could be solved with distribution between multiple batteries of smaller sizes.
gpt
The idea of an interchangeable battery is certainly appealing in the search to speed up recharging electric vehicles. However, there are a number of practical limitations and they largely center around the weight and size of the battery packs.

The battery pack of a fully electric car can weigh as much as 500 kg. With such a weight, even if you break it down in smaller batteries (and indeed, the battery packs consist of a larger number of individual cells), it's still not something that an average human will be able to quickly carry out and replace.

So you need to do it in an automated way. But then you end up with the problem that not every model is the same and there is no one-size-fits-all solution to taking out a battery pack and replacing it with a robot. While the number of electric car models is still quite limited today, that will change rapidly. And with more different models, the updates to an automatic system will have to keep coming.

And from that we branch to another problem and that's the location of these battery packs. Since they're so heavy, you can't simply dump them all in the trunk or in some other spot. In order to ensure that the car still handles OK, the battery packs are typically spread out across the bottom of the vehicle, distributing the weight more evenly. To replace the batteries, you'd have to essentially dismantle parts of the bottom of the vehicle to be able to access every location where a battery is installed.

Doing this in an automated way for a rapidly increasing number of models each with its own layout and construction is very impractical. So for now, and probably for quite some time to come, the best way to recharge your electric vehicle is to simply plug it into a charger and wait.