Uber has denied pressuring customers into paying higher fares, even though the app can detect when phones reach low levels of battery, as it switches the app into a power saving mode.
http://www.dailymail.co.uk/news/article-3603264/Does-Uber-know-desperate-ride-App-knows-tell-phone-battery-low-likely-rush-paying-surge-prices.html
SURGE PRICING WAS TOO UNPREDICTABLE TO ME SO I NEVER USED LYFT OR UBER