Polar Vantage V2 review: big on recovery but struggles to go the distance

The Polar Vantage V2 is the second generation of Polar’s flagship multisport watch aimed at serious runners, riders and swimmers. It comes with a beefed up 100-hour endurance battery, a lighter, sleeker design, improved touch screen and button controls and the most complete suite of performance, training, recovery and sleep tools we’ve seen on a…