The LIR2032 is a rechargeable lithium-ion coin cell in the CR2032's 20 by 3.2 mm case. It outputs a nominal 3.6 volts, charging to 4.2, and holds only 40 to 45 mAh. It is not a general-purpose substitute for the CR2032 despite the identical fit.
LIR2032, face and side profile, drawn to scale: 20 mm across, 3.2 mm thick.
Voltage
3.6 V
Size (D×H)
20 × 3.2 mm
Chemistry
Lithium-ion (rechargeable)
Capacity
40-45 mAh (rechargeable, ~500 cycles)
Compatible replacements
CR2032: Same size, but the CR2032 is a 3 V primary cell. The LIR2032's higher voltage makes it a risky substitute in CR-designed devices.
ML2032: The 3 V rechargeable alternative used in devices that trickle-charge their backup cell.
⚠️ Do not substitute an LIR2032 for a CR2032 in fobs, motherboards, AirTags or medical devices. The higher voltage can damage circuits, and never attempt to recharge a primary CR2032.
Buying and replacement notes
Treat the LIR2032 as a different battery that happens to share a footprint. Its 3.6 to 4.2 volt range exceeds the tolerance of many circuits designed for a 3 volt CR2032, its capacity is about a fifth as much, and its self-discharge of a few percent per month rules out backup roles. Use it only in devices that explicitly support Li-ion coin cells and have appropriate charging, such as certain wireless keyboards and hobby projects with a proper charger.
Commonly used in
devices designed for rechargeable coin cellssome remotes and keyboardsDIY electronics
⚠️ Keep away from children. Swallowed button batteries, especially 20 mm lithium coins, cause severe injury within hours. If a child swallows one, call the 24/7 National Battery Ingestion Hotline (US) at 800-498-8666 or poison control at 800-222-1222 immediately. What every parent should know.
Frequently asked questions
Can I use an LIR2032 in place of a CR2032?
Only when the device documentation allows it. The LIR2032 delivers 3.6 to 4.2 V against the CR2032's 3.0, which stresses or kills voltage-sensitive electronics, and its 45 mAh drains fast. Fit, in this case, does not mean compatibility.
How do I charge an LIR2032?
In a dedicated Li-ion coin cell charger with a 4.2 V charge termination, typically at 20 mA or less. Never put it in a CR2032 device expecting the device to charge it, and never charge a non-rechargeable CR cell, which can vent or rupture.
What is the LIR2032 actually good for?
Devices engineered for it: some solar or USB-charged gadgets, wireless peripherals with built-in charging, and DIY electronics where you control the charge circuit. Around 500 charge cycles at 40-plus mAh beats disposables in high-turnover roles.