After my original Acer battery was defective after 5 years (hardly usable even without power supply) I decided to RAVPower battery. The battery fits seamlessly into my Acer Aspire 5742G and also has a very good performance! The battery life is between 2.5 and 3 hours. The packaging of the battery is high quality and protects the battery during the transport phase very good! That's how it should be! Gladly again!
UPDATE 20/03/2015 I need to reduce to 1 of 5 stars my rating unfortunately. Now the battery does not charge and is therefore defective. Too bad!