How to place thermistor for reading temperature in NiHM single AA cell charger?
I guess that the obvious answer is that it doesn't really matter where the thermistor is placed as long as it is in close contact with the battery being charged, because the cell temperature will be uniform during charge.
I did search the net quite a lot for an answer, but could not find anything about thermistor placement in battery chargers at all. I could only find placement of thermistor in circuit (the schematics). The only reference I found about its physical placement was this: Build a USB Powered AA NiMH and NiCd Battery Charger.


The completed charger with one cell in place. The 2-cell holder was made by cutting the outer positions off of a 4-cell holder. Notice how the thermistor is installed so as to make physical contact with the cells being charged. A small heatsink keeps Q1 cool.

The red marking is where I understand the thermistor was placed, which corresponds to Position C in my picture.