Method of producing nonaqueous secondary battery

A method of producing a nonaqueous secondary battery, comprising:

• preparing an electrode body which includes a positive electrode having a positive electrode active material layer and a negative electrode having a negative electrode active material layer, wherein a surface area of the negative electrode active material layer is larger than a surface area of the positive electrode active material layer and wherein the negative electrode active material layer includes an opposite portion which is opposite to the positive electrode active material layer and a non-opposite portion which is not opposite to the positive electrode active material layer;
• constructing a battery assembly with the electrode body and a nonaqueous electrolyte;
• initially charging the battery assembly;
• aging the battery assembly at 40° C. or higher;
• adjusting a residual capacity percentage of the battery assembly to 11.5% or more and 14% or less, based on the following equation:
• Residual
• 
• 
• capacity
• 
• 
• percentage
• 
• 
• (
• %
• )
• =
• (
• ∑
• charging
• 
• 
• capacities
• -
• ∑
• discharging
• 
• 
• capacities
• )
• ∑
• charging
• 
• 
• capacities
• ×
• 100
• ,
• where the Σ charging capacities and the Σ discharging capacities respectively represent a total sum of charging capacities and a total sum of discharging capacities from the constructing the battery assembly to the adjusting the residual capacity percentage;
• self-discharging the battery assembly and measuring a voltage drop amount after the adjusting the residual capacity percentage;
• and
• determining a quality of the battery assembly based on the voltage drop amount.