While smartphone vendors have been able to cut power consumption dramatically in the past 10 years, most of those power savings has gone into making thinner phones with smaller batteries. So for heavy phone users that need a phone that can still last all day – or even longer – the best option has often been to pair a thin smartphone with a battery case in order to make up for the difference. Every now and then, however, we still see someone release a phone with a large integrated battery, and this year at Mobile World Congress that someone was Avenir Telecom. The company, which licenses the Energizer brand for smartphone use, was showing off its prototype Energizer Power Max P18K Pop handset, a premium-tier...

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