We're fans of Surface on TechRadar, even if we think that Surface Pro is too expensive and Surface RT is too limited. But a big problem with Surface Pro appears to be battery life, with around four hours reported for most. That's about half the battery life of Surface RT and the iPad, but while you might not be too surprised considering the Intel Core i5 that the Surface Pro runs, we'd point you in the direction of the six or more hours that many Ultrabooks can reach. In a two hour AMA (Ask Me Anything) session on Reddit, head of Surface Panos Panay talked about the Surface Pro in detail and had to defend the battery details against Redditors who suggested Panay - and fellow engineers who also appeared to be participating in the chat - were giving guarded answers drawn from marketing speak. They had a point. Exhibit A is a key passage about the battery life and size, and the compromise that has been made. "If you compare [Surface] to say a MacBook Air, you will quickly see that pound for pound in battery size vs battery life, you will find optimizations that puts Surface best in its class. "That said we picked a smaller battery to be sure we were able to give you the same performance and to keep it thin. This kept the weight under 2lbs. While these tradeoffs are challenges as much as they are opportunities, we think given the performance and experience you will be getting, it is an exciting product."Put simply, the 42Wh Surface Pro battery had to be small and, whi
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