The savings are in the details:

The secret to Sapphire's power efficiency is in the design.

We use 60:1 non back-driving gear assemblies, custom made by one of the world's premiere gear producers. Non-back driving means gears 'lock' into place after each movement, requiring no power to remain fixed at rest! 

And here's why that matters:

When filming timelapse in move-shoot-move mode the pauses, or intervals between camera firing and movements, typically consume a majority of the total time you spend shooting.

The Sapphire has the unique ability to 'sleep' during these pauses and keep your camera perfectly positioned... powered or not.