Where do you find inexpensive batteries? I bought a home security system and the batteries need replacing. Home Depot and Rona have them for $25 each! No way am I doing that. They're 3V lithiums.
Also, dollar stores. The Dollar Tree by my house has Sunbeam brand batteries for $1.25 in all the usual battery sizes including 3V and watch batteries.
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Thanks for the suggestions. My batteries are 3V but similar in shape to AAs, but two-thirds the length and slightly larger in diameter. Nonetheless good ideas and I'll follow up.