Fairlight-CMI

Hello Fairlight people

My QWERTY is not responding and I was wondering if replacing the battery would restore 
functionality.  Ed Hughes suggests replacing battery. Have re-seated cards to no avail. Comp 
boots up fine but no response from QWERTY. My question; can I replace a 3.6V 1500mAh 
Lithium Wafer Cell with a 3.6V 1700mAh Lithium Wafer Cell? Radio shack says no problem 
but I figured I'd ask my Fairlight mates. I have a series III running rev 5.14. My machine has 
been so reliable and integral to my music making since  (man, its been awhile) - well since I 
got it. 
Though I don't post often I visit this forum daily, reassured that others are still making music 
with this machine as well.
Peace and thanks from NY
Billyrock