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up-to-date info can be found in the link below
https://en.wikipedia.org/wiki/Honda_Civic_Hybrid

Design

The powertrain of the second generation Civic Hybrid is similar to that of the first generation, with the following notable changes:

• Updated to fourth generation Integrated Motor Assist (IMA)
• More powerful electric motor of 20 hp (15 kW)
• 158.4 V (132 x 1.2 V) Nickel-metal hydride batteries with 5.5 Ah capacity and a 12% reduction in volume.[12]
• Updated to three stage i-VTEC and VCM (Variable Cylinder Management), which permits deactivation of all four cylinders when cruising at moderate speed to run on electric power only. Engine output is increased to 93 hp (69 kW) at 6,000 rpm and maximum torque to 89 lb⋅ft (121 N⋅m) at 4,500 rpm.
• Combined output of both engine and motor is 110 hp (82 kW) at 6,000 rpm. Maximum torque is rated 123 lb⋅ft (167 N⋅m) at 2,500 rpm.
• A new hybrid compressor for the air-conditioner.
• The continuously variable transmission provides a 9% wider ratio range of 2.52 - 0.421:1 between the maximum and minimum gear ratios for better acceleration and reduced engine rpm at high speeds.[12]
• Discontinued manual transmission option.
• The U.S. EPA fuel economy estimate is increased to city 49 mpg‑US (4.8 L/100 km), highway 51 mpg‑US (4.6 L/100 km).[13] (In 2008: EPA revised the way it estimates fuel mileage,[14] as a result, the EPA rating for the 2008 model is: city 40 mpg‑US (5.9 L/100 km), highway 45 mpg‑US (5.2 L/100 km)).
• Updated to 15-inch lightweight aerodynamic alloy wheels (later featured on the Civic DX-G in Canada as well).
• Certified as AT-PZEV throughout 50 states.

InteriorBy using high-performance magnets and high-density windings, Honda is able to increase the power output of the electric motor by 50% to 20 hp (15 kW) at 2,000 rpm when compared with the first generation. The inverter that controls motor speed is integrated with the motor's ECU for more precise control, resulting in greater efficiency and fuel economy. The output of the battery is increased by around 30% to 158.4 V. The battery storage box is designed for better cooling performance and vibration resistance to enhance long-term reliability. The higher output of the electric motor enables the car to run on electricity only, at a steady 15 to 20 mph (24–32 km/h) when cruising on a flat surface.
An internal electric motor is added to the air-conditioner, so it can be powered by either the engine, an electric motor, or both. At a stop, the compressor powered by the battery keeps the cabin cool. An additional compressor that is powered by the petrol engine also engages if rapid cooling is required. When the interior temperature is stable, air conditioning is provided by the battery solely. As soon as the brake pedal is lifted, the petrol engine comes back to life again.The new three-stage i-VTEC valvetrain has low-rpm, high-rpm, and cylinder idle mode. High output valve timing helps the engine to increase its output by 9%. During deceleration, the engine is kept idle. There is no combustion in all four cylinders and the cylinders are sealed shut, reducing pumping losses by the engine. As a result, the recovery of energy wasted during braking is improved by 10%.

A digital display is incorporated in the instrument dash showing how much electricity is sent to the battery or how much is used. When the car is braked moderately, all the green bars light up showing energy recaptured. When the car is braked harder, the conventional brakes are activated.

Car and Driver found when compared with the previous generation, the car was faster, offered greater refinement, was quieter at highway speed, with a stiffer body and a revised suspension that handled bumps better and more quietly.[15]