This impressive lifespan is being achieved not through the use of new battery technology, but simply because the handset will have a bigger cell than any other device on the market to date.
Tech firm, Oukitel, is allegedly going to equip its next flagship device with a 10,000mAh battery, which is three times more capacious than even the biggest phablets on offer at the moment.
Leaked pictures of the smartphone have appeared, indicating that it will feature a sizeable screen. But the bigger battery does not seem to have resulted in many design compromises.
Battery life is the bane of many modern models, since getting two days of use out of a device, without needing to recharge it at some point, is almost impossible.
Bigger cells seem to be the way to go for the time being, although various researchers are working on technologies that will make the batteries of the future both longer lasting and quicker to achieve a full recharge.