Before I found the info posted in my previous reply, I would have said YES, you have to use non-Dexcom app to read sensor value, from transmitter with replaced batteries. It seems replacing battery may or may not reset the day counter stored in transmitter.
The number of days used, stored in transmitter is what makes Dexcom app or Dexcom receiver unable to get readings from sensor.
So… first find a place to replace the battery, I know @beacher has done this. Or if you have someone with tools to do it, check for demos on youtube.
To keep your current sensor going, you can try the method described in my second link in previous post. You would need someone with android phone, they install xDrip, do the reset on your transmitter, which sets counter back to 0 or 1. Then I believe standard dexcom receiver or app will be able to work. But keep track of date, note number days used after that point. Some report they get another 30-60 days, and my be sudden death. But could be monitored if continue to check via xDrip.