1620 Battery you need - https://amzn.to/3Wgpc7e

Here is a quick little video on how you can replace your non working/dead 1620 battery in your Scion key fob. Hope this was helpful for you!

OEM 2018-2019 SCION KEYLESS REMOTE ENTRY KEY FOB FLIP KEY
2016 2017 2018 2019 Scion iM tC xB xD 3 Button High Security Remote Flip Key - HYQ12BFA
FCC Number HYQ12BFA
OE Part # 89070-12C20

Number of Button 3
Reusable YES
Product Type Remote head key
Products By Make Scion
Programming instruction No: Must be programmed at a Dealership or Automotive locksmith
2017-2019 Toyota Corolla iM
2017 - 2018 TOYOTA COROLLA iM REMOTE FLIP KEY - HYQ12BFA
Compatible 2008 - 2012 Scion xD with Anti-Theft
2011 - 2013 Scion iQ with Anti-Theft
2008 - 2013 Scion tC with Anti-Theft
Battery Part Number CR1620