Lenovo and Acer have both unveiled smartphones with much larger than normal batteries.
A total of three devices from the two companies contain cells with 4,000 milliamp-hour (mAh) capacities.
That is more than a third higher than the components used in Samsung and Apple’s latest flagship phones.
Customer surveys have repeatedly highlighted a desire for improved battery life at the top of shopper’s most wished for smartphone features.
But until now, batteries of this size have been more commonly found in tablets rather than 5.5in (14cm)-screened phones.