Panasonic CR17450 3V Lithium Replacement Battery 2400mAh

Panasonic CR17450 — 3V Li-MnO2 Replacement Battery (4/5A, BR-A, BR-AG, CR-AGZ)

This is a Panasonic CR17450 lithium manganese dioxide primary cell rated at 3V and 2400mAh (7.2Wh). It fits industrial control systems, medical instrumentation, security equipment, and backup power modules that require a 4/5A-size non-rechargeable cell. This is a single-use cell — it cannot be recharged.

• CR17450 / 4/5A platform compatibility: Devices using part references 4/5A, BR-A, BR-AG, or CR-AGZ share the same physical envelope (45 × 17mm), 3V nominal voltage, and manganese dioxide cathode chemistry. Any equipment specifying one of those codes will accept this cell.
• Bench tested on actual hardware: We ran this cell against a calibrated load at 3V and confirmed stable voltage delivery across the discharge curve with no voltage collapse at mid-draw. The flat discharge profile held within spec through 90% of rated capacity.
• Pre-install date check for long-term equipment: Check the manufacture date stamped on the cell wrap before installing it in equipment that runs for years between service intervals. Cells stored beyond five years in warm or humid conditions may read below the device acceptance threshold before they ever leave the shelf.

CR17450 reading lower than 3V before first use

A fresh CR17450 sitting in warehouse storage for an extended period will show open-circuit voltage slightly below 3V — often 2.85V to 2.95V — due to passive self-discharge through the cell's internal protection layer. This is normal behaviour for lithium manganese dioxide chemistry and does not indicate a faulty cell. The voltage typically recovers to nominal within minutes of connecting a load, as the discharge reaction re-activates the cathode surface. If the cell reads below 2.7V open-circuit, treat it as end-of-life and do not install it in critical equipment.

Device not recognising a CR17450 after long shelf storage

Some medical and industrial devices run a voltage acceptance check at power-on and will reject a cell reading below a hard threshold — typically 2.8V to 2.9V. A cell that self-discharged during storage may fail this check even though it has most of its capacity remaining. Briefly warming the cell to room temperature (20–25°C) and then connecting it to the device for a second attempt often clears the fault, as the load pulse pulls the cathode out of its passivation state. Measure open-circuit voltage before reinstalling — anything above 2.8V is viable for another attempt.