Photos of the batteries were highlighted on Saturday by Nowhereelse.fr, showing lithium-ion polymer components with a capacity of 1,810mAh. For comparison, the battery in Apple's current flagship iPhone 5s has a capacity of 1,440mAh.
That Apple's next iPhone would feature a larger battery is unsurprising: It's expected that the so-called "iPhone 6" will feature a new form factor with larger display which would be able to cram in an even bigger internal battery.
Saturday's latest parts leak is claimed to be for the 4.7-inch model. Rumors have also suggested that Apple is planning to release a 5.5-inch version of this year's iPhone, a significant increase from the 4-inch display of the iPhone 5s.
The latest leak is actually the second time that such batteries have been shown with a capacity rating of 1,810mAh. The first sign of those parts came in July.
Markings on the latest batteries suggest they were manufactured in June, while the ones pictured back in July were alleged to have been built that same month.
Potentially confusing matters is a yet-unsupported claim made earlier this month that the batteries leaked thus far have only been used for testing purposes. Analyst Sun Chang Xu claimed that Apple in fact plans to cram a 2,100mAh battery into the final shipping product -- but thus far, no such parts have been pictured.
Regardless, a larger iPhone would almost certainly feature a larger battery, allowing Apple to boost its longest uptime for a handset yet.
Apple is expected to host an event on Sept. 9 where it is reportedly planning to show off its next-generation iPhone. If the company follows its usual release pattern, the "iPhone 6" would first begin arriving in customers' hands the following Friday, Sept. 19.