strange cells

[spuffock]

The cells in my phone have insufficient capacity to finish a long conversation, so I thought it wise to replace them. The new cells do not operate the phone at all. Upon checking the new cells, I find them to have a terminal voltage of 1.2 volts with a 22 ohm load. This is as advertised. The old cells, however , are of chinese manufacture, labelled KAIFENG Ni-MH size AAA 1.2v, have a terminal voltage of 1.4 volts into 22 ohms.
There are 3 handsets with this phone ( BT Synergy), none of which work at all on the new cells, and all the cells sport a 1.4V terminal voltage.
Any ideas? There used to be some rechargeable alkaline cells about, but they seem to be long discontinued.
Does BT have any liability about the availability of consumables?

 

[spuffock]

BT phones

I have been informed that the cells used in BT phones have a slightly longer positive pip than everyone else's , and consequently everyone else's cells don't make contact. This explains the non-functionality. A little blob of solder on the new cells and all is fine.
There still remains the enigma of the voltage, though.........

 

[audioguru]

Rechargeable alkaline cells are 1.3V to 1.4V and can be recharged only a few dozen to a few hundred times.
Rechargeable Ni-MH cells are 1.2V to 1.3V and can be recharged 1000 times.

The range of the radio signals of the phone might be reduced when the battery voltage is reduced.