Battery dying in continuity tester

[Big Grouch]

I have a Snap On MT 270 continuity tester, powered by a 9 volt battery. 25 years old, the first battery lasted more than 10 years. Since then, batteries last 6 months to a year, sometimes less. I only use it once or twice a month, and have tried name brand and off brand batteries. Snap On tech line had no idea, just suggested taking the battery out after use, but it's a tiny Phillips screw into plastic. If the leads were making contact I would hear it, its about as loud as a backup alarm. It's in the original package and I make sure the lead isn't near the probe. Ideas? Thank you.

 

[Outlawmws]

Many batteries die on the shelf once opened. T=he only ones that don't are Lithium batteries. They cost more, but for what you are doing probably worth it. (My Glove box flashlights all have lithium's.)

 

[reptilezs]

check the current draw with a multi meter

 

[Bigplum]

Is the Off switch acting a bit flakey?,
The old 9v batteries were made different ,layered little blocks whilst the new ones are made up from individual AAAA size batteries in the pack, so a fair bit of wasted space for given area

 

[monkeyspanners]

I've noticed 9v batteries not lasting long in my weigh scales and vacuum gauge, wondered if it was the cold weather but maybe they just gone rubbish.