CR2032 CMOS Battery – 3V Lithium Coin Cell
CR2032 CMOS Battery – 3V Lithium Coin Cell
The CR2032 CMOS battery is a 3V lithium coin cell used on computer motherboards to keep the clock and BIOS settings alive when the PC is off. If your computer keeps losing the date and time, resets BIOS settings, or shows a CMOS checksum or battery error at startup, a new CR2032 battery is usually the first thing to replace. The same cell is also used in many clocks, remote controls, car key fobs and small gadgets.
What it does
The CMOS (real-time clock) circuit on a motherboard needs a small, constant power source to keep the clock running and remember BIOS settings after the PC is unplugged. The CR2032 supplies that power. The code tells you the size: CR is a lithium manganese dioxide cell, 20 is the diameter in millimetres and 32 is the thickness in tenths of a millimetre.
Key features
- 3V lithium chemistry – a stable voltage across most of its life.
- 20mm x 3.2mm coin cell – the standard CR2032 size that fits common motherboard battery holders.
- Long shelf life – lithium coin cells lose charge slowly in storage.
- Many uses – motherboards, clocks, calculators, remote controls, key fobs and small electronics.
- Typical capacity of about 220 to 235mAh – 235mAh is the figure on the Energizer CR2032 datasheet; capacity varies by brand.
Technical specifications
| Product | CR2032 lithium coin cell |
|---|---|
| Nominal voltage | 3V |
| Chemistry | Lithium manganese dioxide |
| Diameter | 20mm |
| Thickness | 3.2mm |
| Typical capacity | Approx. 220 to 235mAh (varies by brand) |
| Typical weight | About 3g (brand dependent) |
| Rechargeable | No |
Who it is for
- PC and laptop owners whose clock or BIOS settings reset.
- Technicians servicing motherboards, POS machines and routers.
- Anyone replacing a battery in a clock, remote, key fob or scale.
- Offices keeping spare cells for equipment maintenance.
Before you buy
- Check the cell code. Make sure your device uses a CR2032 and not a CR2025 or CR2016, which are thinner and not interchangeable.
- Not rechargeable. Do not try to charge it, and dispose of used cells responsibly.
- Keep away from children. Coin cells are dangerous if swallowed.
- Installation. Switch off and unplug the PC before opening the case; many holders release the cell with a small clip.
Frequently asked questions
How do I know if my CMOS battery is dead? Typical signs are a wrong date and time, BIOS settings reverting to default, and startup warnings about CMOS or battery errors.
How long does a CR2032 CMOS battery last? In a PC it often lasts several years, depending on how often the computer is powered and the brand of the cell.
Is CR2032 the same as CR2025? No. Both are 20mm across, but the CR2025 is thinner and has a lower capacity. Use the type your device specifies.
What is the CMOS battery price in Kenya? Prices change, so check the current price on this page before ordering.
Order your CR2032 CMOS battery from Adepta Technologies with delivery in Nairobi and across Kenya.