Instruction: Using the product's title, description, features, price, and brand, identify and retrieve the values associated with a specified set of target attributes. Output the extracted values along with their respective sources (e.g., title or feature) indicating where each value was found.

Input:
Product title: Original Genuine Laptop Battery for HP Compaq 6720 6720s 6730s 6735s 6820 6820s 6830 6830s HSTNN-FB51
Product description: Compatible Part Number/ Fit Models: * HSTNN-IB51 HSTNN-IB52 HSTNN-FB51 HSTNN-FB52 HSTNN-I39C HSTNN-I40C HSTNN-I49C * HSTNN-I54C 451086-121 451086-161 451085-141 451568-001 456864-001 456865-001 * 464119-142, 464119-362, GJ655AA * HP 550 Series * HP Compaq 6700/6720/6720s/6730s/6735s/6820/6820s/6830s Notebook PC Series
Product feature: Voltage: 10.8 V, Capacity: 55WH, Condition: Brand New, Warranty: 12 Months, Type :Li-ion
Product brand: for HP
Target attributes: Capacity
Answer: attribute: capacity
value: None
source: None