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I'd say where the previous Seiko Kinetic movt was 20% mechanical/80% electrical quartz (it simply uses wrist movt to charge a Li battery which then powers the quartz oscillator and hands), the Spring Drive is a different animal altogether. A large part of it is mechanical – the auto-winding system, the mainspring barrel that stores power, the gear train that moves the hands. The only electrical/quartz part is in the escapement which converts the stored mechanical energy to electrical energy and uses it to power the glide wheel (that moves the hands) and the quartz circuit.
So I'd say Spring Drive is 70% mechanical/30% electrical-quartz.
Watch forums I read Spring Drive is 94% mechanical