Younger readers will think I'm making this up, but back in the day (the 1990s and early 2000s), a cellphone's battery would last the best part of your working week - until the dreaded "Friday phone" low when you had to go searching for your charger.
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Then big touchscreens and thirsty processors arrive and now, of course, you're lucky to get through a whole day. And given lithium-ion batteries degrade over time, in 12 to 24 months that can dwindle to a half-day.
Apple's new iPhone 11 series, released in September, actually got pretty good notices for battery life, as did their predecessors.
As Brian Chen wrote in his review of the 11 series, "The new iPhones all have longer battery life. Even after a day of heavy use, which included taking phone calls, using maps and shooting lots of photos, each iPhone had lots of juice remaining — at least 30 per cent — by bedtime. After similar tests with an iPhone X two years ago, the battery had about 15 per cent left by bedtime."