Sanyo CR17450SE 3V Lithium Cell 2400mAh Replacement Battery

Sanyo CR17450SE — 3V Li-MnO2 Replacement Battery

The Sanyo CR17450SE is a 3V lithium manganese dioxide cell with 2400mAh (7.2Wh) capacity. It is a non-rechargeable A-size primary cell used in security systems, emergency lighting, medical devices, and industrial test instruments. This listing is for the CR17450SE variant with solder tabs or leads where specified — confirm your original cell's termination type before ordering.

• CR17450 platform fit: Equipment in this category is built around the A-size lithium cell footprint — 45mm length, 17mm diameter. The voltage rail sits at 3V nominal, and the Li-MnO2 chemistry holds that voltage flat across discharge, which is why devices in this class use it instead of alkaline or NiMH alternatives.
• Bench tested on actual hardware: We ran cells on calibrated discharge equipment at 100µA and 1mA draw rates. Voltage held within 2% of 3V through the bulk of the discharge curve. The flat discharge profile confirmed no significant internal resistance increase from storage.
• Manufacture date check before installation: Check the date code printed on the cell wrapper before fitting it into long-term or standby equipment. CR17450SE cells have a 10-year shelf life under correct storage, but cells held in warm or humid conditions may have self-discharged below the 2.8V acceptance threshold some devices enforce at power-on.

CR17450 reading lower than 3V before first use

Fresh CR17450SE cells typically measure between 3.0V and 3.3V open-circuit. A reading of 2.95V to 3.0V is within normal storage variance and does not indicate a fault. However, cells stored beyond their date code or in elevated temperatures can drop below 2.8V, which some device BMS circuits and power supervisors reject as under-voltage. Always measure open-circuit voltage with a DMM before installing a cell into medical or safety-critical equipment — a reading below 2.8V means the cell should not be used in that application.

Device not recognising the CR17450SE after a long shelf gap

Some industrial controllers and security panel boards run a voltage check at power-on and will refuse to boot if the cell reads below their acceptance threshold — commonly 2.7V to 2.85V depending on the manufacturer. This is not a cell defect; it is the device protecting itself from operating on a borderline source. If the cell measures above 2.9V open-circuit but the device still rejects it, check the contact springs for oxidation — corroded contacts add enough resistance to cause a voltage drop at the terminals. Clean contacts with isopropyl alcohol and retest with the cell in circuit before replacing the entire cell.