Panasonic vl20 rechargeable button cell lithium 3v 203050mah panasonic vl2020 1vce this 20mah rechargeable button cell from panasonic is a vanadium pentoxide lithium battery equipped with solder tags for low current output use only such as replacing the battery of a bmw ignition key panasonic vl2020 1vce 20mah rechargeable button cell lithium 3v 1 pcs