The PowerMax P18K Pop is three times the thickness of a regular smartphone

A chunky mobile phone with a battery life of 50 days has been hailed as the antidote to the ultra-sleek handset that dies on you by teatime.

The Energizer PowerMax P18K Pop is as thick as two to three ordinary smartphones and features an 18,000 mAh power pack that is claimed to be the highest capacity ever seen in a smartphone, compared with the 2,716 mAh battery of the iPhone X.

To put that into perspective, the maker claims: “Users will be able to make up to 90 hours of calls, listen to 100 hours of music and watch two days of video on a single charge. In standby mode, the battery lasts up to 50 days.”

The phone will go on sale this summer priced at about £500

Energizer has shied from publicly disclosing details of