CR2032 3V CMOS Battery with 2-Pin Wire Connector (BIOS Backup Battery)

Specifications:

• Battery Type: CR2032 Lithium Manganese Dioxide (Li-MnO2)
  
• Nominal Voltage: 3.0V
  
• Rated Capacity: 220mAh
  
• Connector Type: 2-Pin Polarized Molex / JST Compatible Pitch Connector
  
• Wire Harness Length: ~100 mm (10 cm)
  
• Insulation Wrap: High-dielectric PVC thermal heat-shrink casing
  
• Chemical Composition: Non-rechargeable Lithium Primary Cell
  
• Operating Temperature Range: -20°C to +60°C
  
• Dimensions: 20mm Diameter x 3.2mm Thickness (Cell dimensions excluding harness)
  
• Weight: 5 grams

Key Applications

• Network Infrastructure: Maintaining configuration data in enterprise routers, firewall appliances, and managed network switches.
  
• Industrial Embedded Computing: Real-time clock backup for single-board computers, industrial PCs, and HMI control screens.
  
• Custom Prototyping: Providing standalone RTC fallback energy for data logging shields and remote field monitors.
  
• Consumer Repair: Replacing failed BIOS batteries in mini-PCs, thin clients, and compact motherboard platforms.

Project Evolution

If you have previously mastered basic prototyping with bare coin cells on a breadboard, you know how fragile loose metallic battery contacts can be when subject to slight motion. Upgrading your deployment to this pre-wired 2-pin insulated module completely unlocks clean wire routing and ultra-reliable shock tolerance. This is ideal for Intermediate-level embedded projects where custom, space-constrained enclosures cannot accommodate a large plastic coin cell holder. Minimum hardware required includes a host development module containing a 2-pin battery backup entry header or an external real-time clock breakout board.

Virtual Technician & Wiring Guidelines

⚠️ CRITICAL ELECTRICAL WARNING: This battery is a non-rechargeable primary lithium cell. Do not expose it to external charging rails, or you risk thermal runaway and rupturing the chemical core. Ensure that any charging circuit on your development board is disabled or bypassed before connecting this battery.

 Pin Mapping Guide:

• Red Wire (+): Positive Terminal Connection. Connect directly to the VBAT or VBACKUP header pins of your microcontroller or real-time clock board.
• Black Wire (-): Negative/Ground Connection. Connect directly to the common system GND header terminal.

Package Includes:

1 X CR2032 3V CMOS Battery with 2-Pin Wire Connector (BIOS Backup Battery)

Frequently Asked Questions (FAQ)

1. What is the exact wire pitch connector type on this CR2032 assembly?
   The assembly uses a micro-scale 2-pin polarized connector with a standard spacing suitable for compact motherboard backup headers.
2. Can this battery be recharged using an onboard USB power supply?
   No. This is a primary lithium cell. Attempting to charge this device will damage the battery casing and create an electrical hazard.
3. How long will this battery keep a standard BIOS configuration alive?
   Under normal low-power standby current draws, it will reliably retain data and keep the RTC ticking for 3 to 5 years.
4. Is the external wrap around the cell safe to leave on?
   Yes, the outer wrap is electrical grade insulation. Do not strip or remove it, as it prevents short-circuits against chassis elements.
5. What happens if I reverse the red and black wires during installation?
   Reversing polarity can damage sensitive RTC components or wipe memory instantly. Always double-check your motherboard's pin mapping before plugging it in.
6. Can I use this directly with an Arduino Uno board?
   The Uno lacks a dedicated onboard hardware backup rail (VBAT), but you can connect this battery to an external clock shield or module like the DS3231.
7. What is the shelf life of this battery if stored in a parts bin?
   It features an incredibly low self-discharge rate, maintaining up to 90% of its native charge over a 5-year shelf storage period.
8. Is this component rated for industrial outdoor environments?
   Yes, it functions down to -20°C and up to +60°C, making it stable for field monitoring units and outdoor telemetric stations.
9. Can the wires be safely snipped and soldered directly to a custom circuit board?
   Yes. Ensure you cut and strip each wire one at a time to avoid shorting the positive wire against the negative wire with your wire cutters.
10. What is the continuous current draw capacity of this battery?
    It is optimized for micro-ampere level backup loads (typically 5µA to 20µA continuous standby current).
11. Will this work as a direct replacement for an old laptop CMOS cell?
    Yes, provided the laptop motherboard matches the 2-pin layout. Check the legacy connector terminal dimensions before installation.
12. Does this variant include a double-sided adhesive mounting patch?
    This listing is for the insulated battery and wire harness assembly. We recommend using generic non-conductive mounting tape to fix it to the chassis.
13. What is the exact nominal voltage of this cell?
    The core cell delivers a stable 3.0 Volts throughout the majority of its discharge lifestyle curve.
14. Is this battery completely mercury-free?
    Yes, it is built with modern green lithium chemistry containing zero added mercury or cadmium.
15. Why is my device resetting even though the battery is plugged in?
    Ensure the connector pin is fully seated, the wire orientations match your board's schematics, and that no dust has corrupted the socket pins.
16. Can I tape multiple units together to increase capacity?
    Do not connect primary cells in parallel or series without balancing diodes, as it can induce cross-charging and destructive cell failure.
17. How thick is the complete insulated assembly?
    The battery assembly measures roughly 3.5mm to 4mm in thickness when accounting for the wire joint protection wrap.
18. What happens if the cell drops below 2.0 Volts?
    Once the voltage drops below 2.0V, the attached logic systems will start failing to access or read valid memory blocks during boots.
19. Is it affected by continuous mechanical vibration in industrial robotic frames?
    No, the direct wire integration with strain relief is far superior to standard metal pressure clips under high vibration profiles.
20. How do I safely dispose of this cell when it fully depletes?
    Please drop it off at an official local e-waste processing facility or battery reclamation center to preserve ecological recycling loops.