Apple is prioritizing larger batteries and more advanced health sensors over fingerprint authentication for the Apple Watch, according to a new claim from a prominent Chinese leaker. In a new Weibo post, Instant Digital pushed back on recent speculation about biometric recognition coming to Apple's wearable lineup, claiming instead that the company remains content to let users unlock their devices via their paired iPhone. Adding Touch ID sensors would introduce extra cost and eat into precious internal space that could otherwise be used for battery capacity, which is a tradeoff Apple apparently isn't willing to make at this stage, suggests…