wrote:
On Fri, 17 Jul 2015 07:38:29 +0000 (UTC)
Recliner wrote:
More relevant was the Rolls Royce Phantom which I quoted. Its batteries are
probably as big as a bus's.

I doubt it. On the youtube video of one of the BYD buses it says the
batteries weigh 3 tons.

Yup, the car battery was 'only' 2/3 of a tonne:

From
http://www.autocar.co.uk/car-review/...-phantom-102ex

The 71kWh battery pack is made up of a NCM
(Lithium-Nickel-Cobalt-Manganese-Oxide) pouch cells. There’s a total of 96
cells weighing 640kg, 90kg more than the combined weight of the
conventional engine and transmission.

Three separate 3kW charger units are fitted to the battery pack and it
takes 20 hours to recharge the huge battery. Using a three-phase electrical
supply it takes eight hours for a full charge.

The 102EX also features induction charging, using an induction pad mounted
under the floor. Positioning the car over a transmitter pad, installed in
the road surface allows the battery to be recharged across a gap of 150mm.

This giant battery pack drives a pair of electric motors, which are mounted
on the rear subframe, and housed inside water jackets, themselves chilled
by coolant piped down from the radiator.

The motors drive a single ratio transmission with an integrated
differential. Each motor is rated at 145kW but, more importantly, together
they also deliver a whopping 590lb ft of torque from standstill. Although
the power from the motors is 48kW down on the equivalent power from the
V12, the torque peak is 59lb ft, or 11 percent, up.