Panasonic vl1220 rechargeable button cell lithium 7mah 3v panasonic vl1220 1hfe this 7mah rechargeable button cell from panasonic is a vanadium pentoxide lithium battery equipped with solder tags offers twice the energy density of button type nickel cadmium battery and ideal for cmos clock memory backup applications panasonic vl1220 1hfe rechargeable button cell lithium 7mah 3v 1 pcs