Although not generally listed for the E70 (shows 6800), the E70 does fit correctly in the MBC-13L car cradle.
This cradle has sockets for "pop-port" and 12v power but only the Pop-port "passes through" to the phone itself.
Does the power/charging transfer to the pop port within the cradle - ie can pop-port charge the phone ?
Answered my own question - seems to be a big yes.
http://pinouts.ru/CellularPhones-Nokia/nokia_pop_pinout.shtml