I made a couple of one gallon batches of mead in August. They are both basic. Honey and water. One I made with 3# of honey and the other with 4#. Both used the same batch of honey and the same yeast (Lalvin D47). The same process of making the must.
The day after we made the must the 3# batch was bubbling away in the little one gallon carboy. The 4# batch was bubbling, but a bit slower. Over the course of a few days it caught up. Both bubbled visibly approximately the same amount of time. I racked them, but didn't measure the SG a second time then. Measured recently and found something that didn't make any sense.
The 3# batch SGs were before 1.118 and after (I can't remember the exact number, I don't have my notes handy) but the ABV calculates out to 12.8%.
The 4# batch SGs were before 1.128 and after 1.092 which comes out to 4.8% or so. I repitched yeast the other day and wrapped the bottle in a grow mat that I use for starting seeds. It keeps the carboy around 80 degrees F. We left town the next morning, but there was a little foam on top and I could see some little bubbles coming up. So I figured it might have taken. But after coming back last night... no bubbling going on.
Can anyone shed some light on what might have gone wrong? Thanks!