The V3 Spikelights will be powered by a very special energy cell that will be whole new experience for most users (who aren’t electronics-nerds). It’s called the ’18650′ cell.
If you like to carry a spare battery with you, then I can confidently say, that spare 18650 cells are lighter, smaller and cheaper than any other headlight battery on the planet (for the same amount of energy stored).
Better yet, you can buy them all over the world in a very competitive market. Other high-end headlight manufacturers force you to use their own special-shaped battery. This means you have no control over the quality or the price – and if they stop selling them oneday, then that’s just too bad!