White-Rodgers 1F90-51/-60 digital, programmable thermostat from
about 1987.

Mea Culpa: I left 3 Duracell AA batteries in the unit for years and years.
Corroded the little spade connectors so bad that 2 broke off.

I jerry-rigged something that got it going again, but it's so
flimsy that it could fail anytime. And it's cold, Cold, COLD
nowadays (midwest US).

It looks like a common design. Copper spade connectors that mount
in a groove in the plastic on one end, extend to allow contact
with the battery poles on the other.

Any suggestions on how to do a substantial repair? It's a great old
(4 wire, single-stage) control, there's a zillion of them around
here yet in service: in friends houses, businesses, etc. Moreover, I
got nooooooo idea what t-stats they got on the market currently or
how they might wire.

Thx,
P

"Take Yo' Hand Out My Pocket (I Ain't Got Nothing What Belongs To You)!"
- Rice Miller, who probably never even _heard_ of GW Bush, Paulson, etc