A couple of days ago I saw someone trying to push a car to the side of the road and stopped to help. After we got the car parked, he told me that it had suddenly stopped running. So I pulled out the cheap HF digital multimeter and found it would not work because it's battery was dead. Later I put in a new alkaline battery and it was working once more.
So if you have a inexpensive digital meter in your car or truck, you might want to keep a replacement battery with it. Or replace the original non-alkaline battery with a alkaline battery. The non- alkaline batteries have a fairly short shelf life.
Dan