They are the same size as traditional alkaline batteries, so no modifications are required. (which is very unusual for me). But they fit. Anywhere that requires two AAA batteries (!WARNING! This is the only condition: use these in a device that USES TWO AAA BATTERIES, TWO AAA BATTERIES, AND ONLY ONE LITHIUM BATTERY AND ONE OF THEM MAKAN, Slacker ). Just remember. If you use these instead of ONE battery 🔋 (i.e. only in a device that only takes one AAA battery) you will blow up the device (remote etc.) and you can burn your house down. (Just kidding, but this will likely ruin the device, so heed my warning). Use a AAA lithium battery and a mannequin. All my home thermostats use them in it. If you don't use them, then UR MANKET. I've probably saved $100 or more by NOT buying alkaline batteries 🔋 which I just throw away when they run out. Do yourself a favor and buy a surprisingly cheap AAA and AA lithium battery charger ($20 max and they give you AAA batteries with it) and I very rarely have had to buy replacement batteries. They get worse from time to time. I think I've bought about 4, maybe 5 times more AA and AAA batteries this decade. I hope I worded everything correctly. If not, give me a rebuttal. Dave S Staur
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