Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: Tigervivi Laptop Battery A1405 for Apple MacBook Air 13" A1369 (Mid 2011 version) A1466 (Mid 2012 version) 020-7379-A 661-6055 MC503 MC504 MacBook Air Core i5 13" i7[Li-Polymer 7.6V/54.4Wh]
Product description: About Tigervivi, Tigervivi offers high quality laptop battery,our batteries comply with RoHS and CE quality testing standards. More professional, Higher quality and Better service,Thanks for your purchase!, Compatible Part Numbers: Battery Model number: A1405 020-7379-A, Compatible Laptop Models: MacBook Air 13" Model A1369 Mid 2011 Version (Look At Your Laptop Bottom Case to find the Model and the Year) Intel i5 1.7 GHz (Mid 2011) Intel i7 1.8 GHz (Mid 2011), MacBook Air 13" Model A1466 Mid 2012 Version (Look At Your Laptop Bottom Case to find the Model and the Year) Intel i5 1.8 GHz (Mid 2012) Intel i7 2.0 GHz (Mid 2012), NOTE: 1. Please pay more attention on the year of your laptop.You can find the year onr your laptop's bottom Case! 2. Boot up your computer. Click on the apple logo in the upper left corner and select "About This Mac." You will see your Mac Models details. 3. This listing is for a MacBook Air 13" A1405 battery, not for a MacBook Air 11" A1406 battery., Package Included: 1 x Battery for Apple A1405 2 x Free Screwdrivers, Warranty: 12 months product warranty guarantee from Tigervivi. Customer Satisfaction is our Highest Priority. Please feel free to contact us with any questions.
Product feature: Battery Type: Li-Polymer; Voltage: 7.6V;Capacity: 54.4Wh;, THIS BATTERY IS FOR 2011 AND 2012 MODELS ONLY! DOES NOT FIT A1406!, All our products were tested by manufacturer to match and/or exceed specifications of OEM products, No memory and virtually no self-discharge for maximum productivity and less downtime, Warranty: 12 Months Warranty,24 x 7 email support.
Product brand: TigerViVi
Target attributes: Capacity
Answer: attribute: capacity
value: None
source: None