Mercury battery -- alternatives ?

I have 3 pieces of older test equipment that use 1.345v mercury batteries.
I believe they are either used as reference voltages, or one unit uses 2 batteries (for +1.345v) and might be used in a dc bridge (for a null detector unit).

I have found these two things...

1)....For cameras, there is a "silver oxide" 1.55v battery and a zinc disc or other adapter, to mimic the mercury's steady 1.345v.
http://www.cameracheckpoint.com.au/html/mercury_battery.html

2)....Using any battery of a higher voltage, then regulating them to 1.345v.
http://www.techlib.com/electronics/mercury.htm

I'm not sure if a "voltage reference" chip would work.....the closest voltages are 1.2v, or there's a 1.2875v.
(I suspect in the bridge circuit, that the 1.55v silver oxide's might work straight-away, because they're just there to achieve a null, anyway.)

=FB=

Here is the gear I need to build a battery replacement for:
http://i5.photobucket.com/albums/y177/Midiot/PVP1000cr.jpg


Here is the specs I found for one of the mercury battery I need to replace:

Old Battery:

Mallory RM42R T2
Mercury-Zinc
1.345v
14000 mAh
34mm diameter
60.7mm height
167 grams


(text from the equipment's manual)....

"" The mercury cell is thermally lagged to maintain a voltage stability of 0.0005% / 0.5 hour (5ppm / 0.5 hour). This stability is for extremes of temperature variation in a normal operating environment. Where highest accuracy is required, calibration should be checked at the beginning of each new measurement. To maintain stability when the (voltage divider) is disconnected, provide a constant battery load by connecting a 100k resistor across the (voltage divider) load. ""

So, is it possible to use a 1.2V voltage reference chip ....with a current buffer/booster....driven by an isolated line voltage----or a pack of rechargeable batteries ??