After a successful first run, the programme entered a second stage this month to further evaluate battery performance, driver behaviour and other metrics.
If all goes well, Better Place hopes to convince a car maker to mass-produce exchangeable-battery taxis for Japan's capital.
The current test vehicles are converted Nissan Dualis SUVs, called Qashqai in some markets. Nissan is not involved in the scheme directly: an outside company has re-engineered the cars with batteries provided by US-based A123 Systems.
Better Place estimates that Tokyo's 60,000 taxis account for just 2 percent of vehicles on the road but are responsible for 20 percent of vehicle emissions. Moving those taxis onto battery-power will help the environment and might also encourage the spread of electric cars to regular consumers, Better Place Japan President Kiyotaka Fujii says.Also See: The myth that is the great Indian middle class
"Taxis have a touch-point for consumers," he told Reuters
. "Trucks don't induce a person's purchase decision. Taxis do. Once they catch on, I think it'll be quick."
So far, the reaction from passengers has been encouraging.
Of the 700 responses collected from in-car surveys in the three months to July, 97 percent rated their experience as positive. Asked whether they would prefer riding in an all-electric taxi over a conventional one, 70 percent of passengers said they would, while 80 percent said they wanted all taxis in Tokyo to become electric, according to Better Place.
Takahashi, one of eight Nihon Kotsu drivers behind the wheel of the electric taxis, is also content with his ride. While the electric taxi's maximum range of just 100 km (62 miles) on a full charge means it requires four or five battery swaps every shift, Takahashi said that hasn't stopped him from taking on as many passengers as he would in a normal taxi -- about 22 or 23 a day on average.Also See: Boeing tears down historic Plant 2
"The car handles really well. It's extremely smooth -- much more so than the Prius that I normally drive," he said, referring to Toyota Motor Corp's fuel-sipping hybrid, a popular choice these days for the city's taxis.