IT seems we're always being told that important activities should last longer.

But whilst we all obsess with working more hours or stretching our bedroom romps out to a tantric timescale, there's one activity we all wish was a little less time-consuming: charging our smartphone.

Now the Apple rumour mill has thrown up claims that the upcoming iPhone will be fitted with technology designed to shorten this most boring of procedures.

The gossip comes from an iPhone Twitterer called The Malignant, who often shares rumours which leak out of China - the country where Apple builds its smartphones.

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He suggested the iPhone 7 could come installed with a new circuit which allows to be charged more quickly using a high powered adaptor.

Juli Clover, a blogger at the website Apple Rumours, wrote: "Apple's iPhone models currently ship with a 1A/5W charger, but are able to charge more quickly with a 2.1A/12W iPad adapter.

"With the rumored fast charging feature, charging speeds would presumably be even faster than using an iPad charging adapter with a current model iPhone."

However, she cast doubt on the "sketchy" claims.

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"Improved charging speed is not an iPhone 7 rumor that we've heard before, nor does it come from a reputable source, so this information should be viewed with some scepticism," the Apple expert added.

The iPhone 7 is expected to be revealed in September.