The Battery is brand new original quality comes in loose pack.
Terms and condition of Warranty:
This battery comes with 90 Days replacement warranty
However, if any type of physical damage is there then it is not included in the warranty. Also, if battery is BULGE due to any reason, then it is not covered under warranty
 
This is not made by vivo but quality is same
Charging takes 8-10 minutes extra but backup is superb