Boeing has also proposed several solutions to prevent the battery malfunction, including limiting the voltage range to reduce the energy in the batteries, adding four additional tests for the batteries, and changing the charging unit.

CNN: Boeing announces changes to Dreamliner battery system

For their part, the Glasgow outfit were limiting Zenit to long range efforts and an Anatoly Tymoschuk drive and an Alexander Anyukov half-volley were easily dealt with by goalkeeper Neil Alexander.

BBC: Zenit St Petersburg 2-0 Rangers

But they could plummet if the batteries cause problems or users find the range of the vehicles too limiting.

ECONOMIST: Electric cars