On Wednesday, September 18, 2013 8:43:43 AM UTC-4, wrote:
A new battery shouldn't drain down in a few days in a
generator even if it's not being charged. It's kind of
like a lawn mower tractor battery or motorcycle battery.
They sit around for a couple of months without being
charged and still start.

Not quite the same.

On a lawn mower tractor, the battery only powers the starter motor to make the engine run.

On a generator, the battery is powering the monitoring equipment that senses when street power goes out.