Bought a track day bike last year and finally removed the old transponder. Not sure if anyone could use it. If so, I'll sell it for $10 and ship it priority mail. If it's useless I'll just toss it. Let me know...
https://pitstopusa.com/i-20841032-westhold-activated-car-transponder-green.html I guess it's got an internal battery.
Those have an internal non-rechargable lithium battery. The battery can be replaced if dead. CCS was using these to scoring/timing. Not sure if they still are.