According to China’s Ministry of Industry and Information Technology Telecommunication Equipment Certification Center (TENAA), iPhone X has a 2716mAh battery, plus 3GB of RAM inside. The details were shared by tweets from @OnLeaks:

As you can see from the screenshots below, battery capacity and RAM are circled in red. Interestingly enough, the screenshot below shows a colour option of Rose Gold (via Google Translate), suggesting Apple had planned to debut a third iPhone X colour, or a third option may be available for Chinese users:

The 2,716mAh battery in iPhone X is larger than the 2,691mAh battery in iPhone 8 Plus, but not as big as the 2,900mAh battery in the iPhone 7 Plus. Apple says iPhone X will get up to two hours more battery than iPhone 7.

Below we see the A11 Bionic chip clocked at 2.4GHz and the listing of 3GB of RAM.

When iOS 11 GM leaked, we already found out iPhone X and iPhone 8 Plus would have 3GB of RAM. Given iOS optimizations, even with “just” 3GB RAM iPhone X and iPhone 8 Plus blow away Android competitors with way more RAM.