Mark Chediak :

The kind of battery that powers electric vehicles is now the cheapest it’s ever been thanks to a global ramp-up in production.

Lithium-ion battery packs are selling at an average price of $209 a kilowatt-hour, down 24 percent from a year ago and about a fifth of what it was in 2010, a Bloomberg New Energy Finance survey shows. The rate has further to fall — reaching below $100 a kilowatt-hour by 2025, according to a report by BNEF analyst James Frith.

That’s a magic number for the electric car business. According to Frith, $100 is widely seen as “a tipping point in the adoption of EVs.”