And what do you know, it booted up! Without the 3V! I wasn't expecting that at all. Inserted the AA batteries and for fun tried to turn the unit on before applying 3V to the leads. I put the unit back together with the leads coming out. Anyways, the 0.5V reading gives me more confidence that the battery is the culprit. I'm not sure how I was seeing 1.5V before, perhaps it was a residual charge because the last time I took a measurement it wasn't too long after removing the main batteries. I did measure the battery voltage again after I removed it and ended up with 0.5V. I soldered on a couple leads to the battery terminal with plans to do some testing with an external 3V battery to see if I could get it to boot up. I decided to de-solder the battery hoping there was a marking on the other side but unfortunately there wasn't. I took a look at the battery and on the side that was visible it only had markings "68 f+" which I couldn't find any info on. Well, good news! Though I'm a little puzzled, too.
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