Batteries are only covered under warranty for one year and are not covered under the accidental damage protection.


The part numbers for a genuine Lenovo battery (Internal, 3c, 42Wh, LiIon, SMP Rechargeable Batteries , internal)  are 01AV443 or 01AV442.


Lenovo - https://lenovo.encompass.com/item/11092855/Lenovo/01AV443/



Newegg  - https://www.newegg.com/Product/Product.aspx?Item=9SIAFUD7ZE7984&Description=01AV443&cm_re=01AV443-_-9SIAFUD7ZE7984-_-Product


You may also locate one on eBay or Amazon by searching for it by part number


For Example:

eBay for $69.19 but shipping from china! - https://www.ebay.com/itm/NEW-Genuine-Laptop-Battery-For-L-SB10K97595-01AV442-3575mAh-11-4V-43Wh-/273132701830

eBay for $52.88 but shipping from china! - https://www.ebay.com/itm/42Wh-New-Genuine-Battery-For-Lenovo-SB10K97595-01AV442-01AV443/113318205749?hash=item1a624a9935:g:FGEAAOSwhN5bySAT