Avenir Telecom’s Energizer HardCase P28K smartphone garnered a lot of attention at Mobile World Congress this week due to its standout feature: a massive 28,000 mAh battery. But the power-bank-with-a-smartphone isn’t the only new device the company is showing off at MWC. The Energizer Ultimate U660S is a phone that stands out for another reason: it’s […] The post Energizer Ultimate U660S is a €499 flip phone with a foldable OLED display appeared first on Liliputing.