Voltage Weirdness

It's strange how the battery voltage varies after the electrodes are restabbed. First it jumps up a volt or so, then immediately drops down to less than it was before. This is followed by a gradual rise and then a gradual discharge, sometimes with random spikes thrown in.

In the plot below, I restabbed the electrodes just after the first hour 18, at the second hour 12, at the last hour 0 or so, and at the last hour 14 (at which time the voltage dropped just a bit too low and the server reset). All other variations were entirely the potatoes' whim.