I think I may have asked about this quite a while back, but I recently had a thought and went looking for new information.
The question is, is it OK to use a 9 V lithium primary in a multimeter that normally uses alkalines? I think at least one of the Keysight DMMs says yes in its manual, but not in their others. The main benefit I see is that there's less of a worry about a leaking alkaline cell in a DMM that's only occasionally used.
Energizer has datasheets for their batteries, and I went to look at what they say about their
9 V alkaline, and their
9 V lithium. According to their discharge plots, the alkaline starts at 9 V, and the lithium starts just a tiny bit above. Eyeballing it, I'd say no more than 9.2 V.
Now on a meter like the U1252B that has a built in NiMH charging option, I believe I saw somewhere that an NiMH cell hot off the charger can be as high as 10 V. If that is indeed the case, and the DMM can handle that, would that mean it's safe to make use of a 9 V lithium primary instead?