You can buy 3.6-volt lithium batteries at major home improvement stores, specialty electronics retailers, and reputable online marketplaces . Because these are often industrial-grade batteries used in security systems and utility meters, they are less common in standard grocery stores. 📍 Where to Buy (Quick List) Online Marketplaces

: Stocks 3.6V cells typically in the security or specialty battery aisle.

: A trusted specialty site for high-performance and industrial batteries.