Rechargeable coin cells look identical to the disposable ones they replace, but picking the wrong series will cost you either cycle life or runtime. The two dominant families are LIR (3.6V lithium-ion) and ML (3V manganese lithium). They are not interchangeable — different voltage, different charging profile, different job. Here is how to choose.
LIR vs ML at a glance
| Property | LIR series | ML series |
|---|---|---|
| Chemistry | Lithium-ion (LiCoO2) | Manganese lithium (Li-Mn) |
| Nominal voltage | 3.6V (charge to 4.2V) | 3.0V (charge to 3.1V) |
| Capacity | Higher | Lower |
| Cycle life | ~500 cycles | ~1,000+ cycles |
| Self-discharge | Higher | Very low |
| Best for | Devices with regular recharging & real current draw | Trickle-charged memory backup, RTC |
When to use LIR
Choose an LIR rechargeable button cell when the device is charged on a schedule and actually draws current between charges — Bluetooth headsets and TWS earbud cases, small wearables, rechargeable lights, and consumer gadgets. LIR2032, LIR2450 and LIR1220 are the common sizes. The trade-off is voltage: LIR sits at 3.6V nominal and charges to 4.2V, so it is not a drop-in replacement for a 3V CR cell in a device that expects 3V.
When to use ML
Choose an ML series cell when the job is memory backup or a real-time clock that sits on a trickle charge inside the host device — motherboards, industrial controllers, meters and instruments. At 3.0V nominal it matches the CR cells those circuits were designed around, its self-discharge is very low, and it delivers well over a thousand shallow cycles. ML2032, ML1220 and ML614 are typical.
The voltage mistake to avoid
The most common sourcing error is treating LIR2032 as a rechargeable CR2032. Physically they fit the same holder, but a fully charged LIR2032 delivers 4.2V into a circuit designed for 3V, and a CR2032 must never be put on a charger. If you are replacing a primary lithium button cell with a rechargeable one, confirm the host circuit tolerates the voltage range and includes a proper charging path.
Charging matters as much as the cell
Rechargeable coin cells need charge control. LIR requires a constant-current / constant-voltage profile terminating at 4.2V; over-charging degrades it quickly. ML cells are usually trickle-charged through a resistor and diode from the host rail, which is why they appear soldered onto boards. Specify the charging arrangement together with the cell — the pairing, not the cell alone, determines how long it lasts.
What about silver oxide and alkaline?
Neither is rechargeable. Silver oxide (SR) cells are primary cells prized for a flat 1.55V, and alkaline (LR/AG) cells are low-cost 1.5V primaries. If your device needs recharging, the choice is between LIR and ML — not between these.
Frequently asked questions
Can I replace a CR2032 with an LIR2032?
Not without checking the circuit. LIR2032 is 3.6V nominal and charges to 4.2V, while CR2032 is a 3V primary cell. The sizes match but the voltages do not, and the host device must provide a proper charging circuit. For a 3V rechargeable drop-in, ML2032 is the closer match.
How many times can a rechargeable button cell be recharged?
LIR cells typically deliver around 500 full cycles; ML cells commonly exceed 1,000 shallow cycles in trickle-charge backup use. Actual life depends on depth of discharge, charging voltage and operating temperature.
Which rechargeable coin cell is best for memory backup?
ML series. Its 3.0V nominal voltage matches circuits designed around CR cells, its self-discharge is very low, and it tolerates the long, shallow trickle-charge cycles that RTC and memory backup use.
Source rechargeable button cells
JBWCELL manufactures the full range of rechargeable button cells, including the 3.6V LIR series and 3V ML series, with standard or custom solder tabs and pins. New to coin cells? See our coin cell buyer’s guide or contact us for datasheets and OEM/ODM pricing.
