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Get the diagnostics probed with a good code scanner not a cheap one. One that can read all of the modules on your car not just the engine.
Read the transmission control units’ parameters and see the transmissions live data.
Once done, then you may get some intelligent help.

“battery to test bad only when it is installed” seem a little lame and not a full story.
If the battery is good and new…it’s good and new.
Now once you install a battery into your cobalt, there will be a small drain, instantly and is expected.
One item is the trunk light, another are all of the capacitors in all of the modules and radios. But this drain is short lived and should quickly die down to milliamps to microamps.
With your car off! You should not have a large current draw.
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