Rechargeable CR2032 Listings Often Mean LIR2032, Which Differs in Voltage and Capacity

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A PlainBattery article warns that marketplace listings labeled rechargeable CR2032 usually refer to a LIR2032, which shares the same 20 × 3.2 mm size but differs electrically. The piece notes that a LIR2032 nominally runs at about 3.6–3.7 V with roughly 35–45 mAh capacity, while a CR2032 is a 3.0 V primary cell rated near 220–240 mAh. Charging a disposable CR2032 or installing a LIR2032 in a device designed for a primary cell can cause overheating, rupture, or over-voltage. The article also explains that milliamp-hour ratings depend on load, temperature, and cutoff, so runtime estimates using average current only hold when conditions match.

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