Has anybody tried replacing the "nonreplacable" batteries in a PET tack? Ive got an old one that quit, so I ground off the case and found two 3V button batteries hooked in parallel. So thats still 3V . I put two D size batt. in series for 3V . Wired it up and it works but the readings are way off. Is it worth it to try to locate the same kind off batteries or is it trash can?
John
John