Apple managed to significantly reduce the thickness and weight of the iPad 2 compared to the iPad 1 by trimming the dimensions of several key components, most notably the battery, according to IHS iSuppli teardown analysis.

The total thickness of the iPad 2 is 8.8 millimeters, down 34 percent from 13.4 millimeters in the iPad 1. The iPad 2 weighs about 600 grams, down 15 percent from 700 grams for the iPad 1. The biggest reduction in thickness came in the iPad 2's battery subsystem. This section in the iPad 2 is 2.5 millimeters thick, a 59 percent reduction from 6.1 millimeters for the iPad 1.

This refinement to the iPad design spurred a 10 to 15 percent increase in its iPad 2 power density, which is a measure of battery life relative to the mass of the battery. It shrinks the iPad 2's weight by 5 grams, while still delivering the same battery lifetime.

The analysis says that another factor contributing to the thinner form factor was the elimination of a stamped sheet metal frame from the display. This slashed the size of the display subsystem to 2.5 millimeters, down 17 percent from 3 millimeters for the iPad 1.

On the touch screen overlay, Apple has adopted a new glass technology that allows it to reduce the thickness of the section while maintaining durability. The touch screen overlay on the iPad 2 is 0.6 millimeters thick, down 25 percent from 0.8 millimeters for the iPad 1.

Physical tests conducted by IHS reveal that the iPad 2 glass is more flexible than the glass used in the iPad 1, a characteristic of increased durability.

The iPad 2 also slightly trims the space between the rear of the display and the top of the batteries. This space now amounts to 1.3 millimeters in size, down 19 percent from 1.6 millimeters in the iPad 1.