OK. The headline is a lie.
There are no garbage "bicycles" in Beijing and they certainly are not electric. Instead there are a variety of pedal powered trikes which serve as garbage trucks. See, in Beijings tight warren-like Hutongs, a US type Mack garbage truck would never fit. But these bikes go there with ease.
But these trikes CAN be electrified and often are. It's quite a simple affair usually. Here is a Moving "Van". The battery is a car battery in the cardboard box on the flatbed.
A bit more sophisticated is this purpose built trike delivering Na'an bread to a Uyghur restaurant. The battery is located behind the steel panel just in front of the right wheel. The motor is the black/silver object immediately behind the wheel, hanging from the underside of the bed. The bed flips up dump truck style.
All sorts of goods are delivered on three wheels ,including coal....
...and more importantly, BEER!
If it looks familiar, that's because this article was originally written by me for Bikejuju.