Varta CR17450 Replacement Battery 3V 2400mAh Li-MnO2

Varta CR AH-R — 3V Li-MnO2 Replacement Battery

The Varta CR AH-R is a 3V lithium manganese dioxide cell in CR17450 form factor (17mm diameter, 45mm length), rated at 2400mAh (7.2Wh). It fits professional measurement instruments, security systems, emergency lighting units, and medical devices that call for the CR17450 cell size. This is a non-rechargeable primary cell — install and run it until depleted, then replace.

• CR17450 form factor compatibility: Any device accepting the A-size CR17450 footprint shares the same 17mm × 45mm cavity and 3V nominal voltage rail. The lithium manganese dioxide chemistry holds a flat discharge curve across the rated capacity, which matters in instruments that interpret voltage drop as a low-battery signal.
• Bench tested on actual hardware: We ran the open-circuit voltage on cells from this batch. Fresh cells measured 3.25–3.30V at room temperature, which is normal for Li-MnO2 at rest. Under a 50mA constant load, voltage settled quickly to the flat 3V discharge plateau the chemistry is known for.
• Shelf date check before installation: Check the manufacture date printed on the cell wrapper before fitting it into long-term standby equipment. Cells stored above 25°C or in humid conditions can self-discharge enough to fall below a device's acceptance threshold, even within the rated 10-year shelf life.

CR17450 reading lower than 3V before first use

A freshly unpackaged CR17450 measuring 2.8–2.9V is not necessarily faulty. Li-MnO2 cells ship in a slightly suppressed state and can show a surface-charge dip on the first voltmeter reading. Apply a small load — even the device itself — and check the voltage again after 30 seconds. If it climbs back above 3.0V under that light load, the cell is functioning normally and will deliver its rated 2400mAh through the discharge curve.

Device not recognising the cell after long shelf storage

Some instruments and security panels check incoming cell voltage against a minimum acceptance threshold — commonly 2.8V or higher — before switching to battery power. A CR17450 that sat in warm storage for several years may have self-discharged to the point where the device rejects it at power-on. Measure the open-circuit voltage with a multimeter: if the reading is below 2.7V, the cell has self-discharged beyond recovery and needs replacement. If the reading is above 2.8V but the device still rejects it, clean the contact terminals with a dry cloth and reseat the cell firmly before retesting.