Trail Runner Free is a comfortable and lightweight headlamp for everyone who loves running. Its features and light beam are optimized for a runner's needs. The basic version of the Trail Runner Free series comes with 3 x AAA batteries and the Hybrid battery case.
5th version? Maybe they'll be better that the previous ones which devoured batteries at a ridiculous rate or randomly switched off (or both). Had several, and had one replaced under warranty, then gave up. Petzl Nao is better in all regards. The latter doesn't have a remote battery, but as the connector was one of the things that made the Silva one randomly switch off, that's no bad thing. I'm not one for being out-spoken about products, but this thing could never be allowed out on a hill - its venerable BD predecessor went instead (or a bike light on an elastic headband)