The indoor part of the inside/outside thermometer has again had problems with the Nickel-Zinc batteries. Once again I noticed it because the illumination was weak. And once again the voltage of one of the batteries had dropped to just over 1.0 V. Looking at my records, I see it was the same one I had problems with last time. Here part of my records:
| Before | After | |||||
| Battery | Date | charge | charge | |||
| 5 | 15 October 2012 | 1.765 | 1.896 | |||
| 10 | 15 October 2012 | 1.007 | 1.848 | |||
| 5 | 23 October 2012 | 1.798 | 1.867 | |||
| 10 | 23 October 2012 | 1.024 | 1.797 | |||
So clearly there's something wrong with battery 10. More importantly, batteries of differing quality really don't mix. I wonder what I can do with a single flaky battery, apart from throw it out. I think it would work OK without being in series with a more powerful one.