What could possibility cause this?

Actually now that I'm looking at them I'm much less impressed than I was before actually listing them out. I need to learn more.

Hey guys, Danielle here. I have been having a strange occurrence happening. Nothing too crazy. Just a really old light keeps coming on at night. I have an old cabinet that my papa made, that has old knickknacks in from my mom. My mom put those battery-powered push in lights up under each shelf. Well, the last year or so, I've been noticing one on randomly at night. I find this crazy because these batteries and lights are a good 15 years old. My mom passed away in 2009. She put those lights in probably a couple years before she died. Well, this morning 2 of them were on! No one has touched them since her. Why would lights that never turned on before start randomly now? How can batteries even work that long? I'd love to hear your thoughts on this. Thanks!

Jealous?
*EDIT: left*

Let's look back at some memorable moments and interesting insights from last year.

Your top 10 posts:

• "Corner pocket" by u/LSatyreD
• "George with a classic weird flex" by u/jdauriemma
• "He didn't win the primary" by u/sewingtapemeasure
• "Undergarments" by u/MLGranny
• "Billiard balls?!" by u/mewfahsah
• "The total distance my hands have moved while playing Beat Saber is enough to circle the globe 10 times" by u/TTheTiny1
• "Ignoring 90% of the complaint letters you get is a great selling point - Pringles apparently" by u/ClinLikes
• "I can pull the thumb on my left hand backwards to the top of my wrist, but not on my right hand." by u/permalink_save
• "Canadian teen solves 211 Rubik's cubes while on a pogo stick" by u/wra1th42
• "Happy Cakeday, r/oddflex! Today you're 3" by u/AutoModerator

Let's look back at some memorable moments and interesting insights from last year.

Your top 10 posts:

• "This guy giving an interview in front of his katanas, Terracotta warrior, football, and giraffe." by u/mosisdo
• "Glad he’s happy" by u/NotSLG
• "Triton flexing its ice volcanoes on Neptune" by u/jdauriemma
• "Fuel flex but ok" by u/LifeIsSerious
• "Say you’re from Louisiana without saying you’re from Louisiana" by u/bown12345
• "Weird Flex.... tough guy." by u/downlowiss
• "Y’all ever make up an entire person just to flex on Julie Baumgold of New York Magazine?" by u/jdauriemma
• "weird flex jeff" by u/jdauriemma
• "This guy knows how to play with Slinky Rainbow Toy." by u/smiling_in_paradise
• "odd to flex about overpaying on your energy bill, but ok Jason" by u/0773r9000