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Honda isn't working with another auto-maker -- at least not yet.

Honda has joined the list of companies looking into solid-state batteries for electric vehicles.

"We've been researching all solid-state batteries. At the moment we're not developing them with another auto-maker," a spokesperson for the Japanese company told Reuters.

Nissan and Toyota, Honda's main rivals in Japan and abroad, are also developing solid-state batteries. Notably, Toyota believes it can bring the technology to the market in the early 2020s. It might team up with Panasonic to split costs and accelerate the development process.

If all goes according to plan, solid-state batteries will replace the lithium-ion batteries commonly found in most of today's electric and plug-in hybrid cars. Early estimates suggest they'll offer considerably more driving range and much quicker recharging times. They'll be safer, too.

It doesn't sound like Honda's solid-state batteries will be ready for mass production when the company launches its promised electric car offensive. The Clarity -- which is offered as a plug-in hybrid, an EV, and a fuel cell-powered vehicle -- will be joined by a range of long-range battery-electric models in 2019. One of them will be a toned-down version of the Urban EV concept (pictured) shown at the Frankfurt Auto Show earlier this year.