I've heard a lot about the marginal battery life on the S6. I've found that at the office, I'll get through a full day of work without having to recharge, but I've never thought too much about it because I always have access to a Quick Charger.
However, last weekend I had a chance to test side-by-side with my wife's S6 out at the ballfield. No chargers in site, 9+ hours of competitive softball! I set my S6 to 'Reduced Power Consumption Mode' while she left hers at full draw. We both checked the weather frequently (heavy weather coming in), shot lots of photos, videos and updated our social networks. We both had our screens set to Auto Brightness. I could tell my screen just wasn't quite as bright, but perfectly visible on an overcast day.
After 9 hours of ball, she was down in the warning zone of 15% battery or less; while I was at 32% - still plenty of juice to go the distance!
Now the reduced power mode does cut CPU performance - if you're into gaming, you're going to loose some FPS - but it didn't impact browsing, social networks, photography and image editing or network data speeds. So I think it's a great compromise to squeak out an extra few hours of use before you can get back to your quick charger!
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