the International Rollei Club

I recently bought a rollei 35 in bargain condition from KEH.com and a m9 adaptor for the battery so i can get the correct voltage. I popped in the battery and the needle moved and seemed to read accurate but when i went out in the sun the needle immediately started to wiggle back and forth till it went all the way back and it hasn't moved since then...
does anyone know what to do? is it dead or can it be fixed? i have a film loaded so can't check the battery until i'm done shooting that roll.

Thanks for help

a) clean battary contacts, tighten battery compartment cover firmly, try again.

b) open top, clean area around battery contacts, resolder wiring (add small wires / new battery contact were needed), try again.

c) replace meter.

Update:
The meter just started working and has been great.