I'm afraid I can't do that, Dave...
1,5 V is way to low for most electrets, if you count in that you loose a few hundred millivolts over the resistance and because battery voltage goes down after a while.
The 4 connector mini jack electrets all get 5V. You can go up to 9V without any problem. I use 12V a lot, because I've got some 12V T-power sources.
A higher voltage will result in better high SPL handling, lower noise and a bit more distortion. But it's the first two that count for me.
This is a schematic for an electret mic on phantom power. Should be easy enough to translate to a 3,5 mm quad jack. Maybe build this into a small box with a quad connector?