A YouTube channel named "Flat Out" testing BYD (A Chinese e-vehicle brand)'s E6 model come out 10 years ago. As second hand car, it now worths HKD6,000 only.
https://www.youtube.com/watch?v=HCrtk5_GCVk
The car is over 10 years old, and have mileage over 280,000km already. The performance you see in the video is already in "sport mode".
In the beginning part of video is a lot of history because this is the first batch of e-vehicle taxi imported to Hong Kong. It claims can go 300km after fully charged, but most taxi owners found it drops to under 100km after a year. And worst, taxies in Hong Kong are expected to run like 7 x 24 because they'll be shared by multiple drivers of multiple shifts. The 2-hours charging time (with their proprietary adaptor) made it very unsuitable to be used as taxi in Hong Kong. And the price per km is roughly the same for electricity when compared with LPG taxies. Because of these, while they order 47 as the first batch, at the second batch the taxi guilds only ordered 1.
Then they go and tested the car on the infamous "steepest slope" in Tai Po (with ratio 1:4), where even though they did "flat out" on the gas pedal, it only goes 3 km/h and decreasing. Fearing it may roll backwards in the mid-way, they decided to U-turn and leave there.
The second half of the video is to compare it with other e-vehicles at the time like Tesla Model S generation 1.
And near the end is the footage that they return to that steep slope to try it the second time, this time with the driver only.
In the comments, there's someone state that the newer generations of E6 has the same problem on steep slopes.