Laptop Battery Help

[BluebirdCCFC]

I need a new battery for my Acer Aspire 5742 laptop.

Where is the best place to buy? (Taking into account price and quality of the product)

Also do I need to buy an exact replacement and match the voltage etc?

[AirShowNut]

I have always found that Amazon is a decent place to get replacement laptop batteries both for price and service.
Enter your laptop make and model in the search and the correct ones will be listed.