"New" replacement battery manufactured in 2014 - still useful?

Hey guys,

my display broke and during its replacement I also want to change my battery, because the original one is almost 3 years old.

I bought one on ebay with LG logo and the correct inscription, but the fabrication date is 21 March 2014.

Is the battery still suitable or did it lost too much capacity already? Because otherwise I would just stick with the original battery.

Thanks!