I have 10 sets of a setup that's 2 CR2032 coin cells in parallel supplying to a 13Kohm resistor (1% tolerance). I started with brand new coin cells wi th voltages around 3.1V individually which I measured prior to put them in parallel. The coin cells are seated in coin cell holder which I've bought. I monitor the voltages at the resistors daily and after about 35 days later , I see varying voltages between different sets. Some stays around 2.9 and others around 2.8 or even lower. I measure individual coin cell voltages on sets that has the lowest voltages. I found there are differences in voltag es between cells. 1 cell could be at 3.0V and the other cell could read 2.7 V. Also I noticed that when I tried to measure the voltages at resistor, th e meter reading is not stable, varying from 2.7 to 2.6 and 2.5 by the secon d. Can someone please explain the phenomenon I am witnessing here?
- posted
9 years ago