Tom,
I will remove the battery from both engines measure voltage then charge them and try again.
That won't effectively test the battery. Test the battery as follows:
- Put the engine on a track and give it power.
- Start it making sounds either under DCS or conventionally.
- Immediately turn off track power. If sounds do not persist for 6-7 seconds after track power is turned off, charge the battery until sounds do persist for 6-7 seconds, or replace the battery and retest.