Hi, I am using a Wheatstone bridge to measure very low resistances (around 0,2ohms) and my measurements are changing from day to day. If I take the resistance measurement of the same resistor several times, I notice that each measurement will be lower than the next. But the next day, the resistance will be fairly high again, and decrease on subsequent measurements. My hypothesis is that the battery is draining, or at least losing some kind of potential, and it "self recharges" overnight, (kind of like a gameboy that would run out of batteries, and run for a few seconds the next day? =S) I think we are using a series of batteries (I don't want to disrupt my circuit to check, but it's just standard batteries you can buy anywhere.) Is my hypothesis valid? Is there a name for this phenomenon? Is the battery really recharging (a bit) overnight?