As first discovered by AnandTech, Apple started quietly shipping an updated iPad 2 model with a Model Identifier of "iPad2,4" on or around March 25, 2012. This model is not formally acknowledged by Apple, but it has a smaller 32 nm 1 GHz "dual core" Apple A5 processor (S5L8942, APL2498) and slightly superior battery life. Consequently, EveryiPad.com has documented it as its own model.

Just like the 45 nm 1 GHz "dual core" Apple A5-powered iPad 2 (Wi-Fi Only), this model is equipped with a 9.7-inch (1024x768, 132 ppi) multitouch "glossy" LED-backlit IPS display and runs a version of the same iOS operating system that powers the iPhone and iPod touch models. As a result it is compatible with thousands of iPad-specific apps as well as most apps for the iPhone/iPod touch, but not Mac OS X apps.

This iPad 2 also has 16 GB of flash memory (the earlier iPad 2 model originally was offered with 16 GB, 32 GB, and 64 GB of flash memory), front and rear mounted cameras, 802.11a/b/g/n Wi-Fi support, an accelerometer, a three-axis gyroscope, an ambient light sensor, digital compass, a speaker and a built-in mic packed in a 0.34 inch thick, 1.33 pound glass and aluminum case with a black or white front and an aluminum back.

Officially, the battery life of this iPad 2 is the same as the earlier iPad 2 (Wi-Fi Only) model -- 10 hours "surfing the web on Wi-Fi, watching video, or listening to music."
https://everymac.com/systems/apple/ipad/specs/apple-ipad-2-wi-fi-ipad24-2012-specs.html