Backup Battery Holder: Lifespan >10,000 insertion cycles

Component Specifications

Definition

A precision-engineered component designed to securely house and maintain electrical contact with a backup battery (typically coin cell type) in Real-Time Clock circuits. It provides uninterrupted power to the RTC chip during main power loss, preserving accurate time and date data in electronic systems. Key features include low-contact resistance, vibration resistance, and reliable spring-loaded contacts for consistent battery performance.

Working Principle

The backup battery holder maintains physical and electrical connection between the battery and RTC circuit through spring-loaded contacts. When main power is available, the RTC operates from the primary supply while the battery remains in standby. During power loss, the battery automatically supplies power to the RTC chip through the holder's conductive path, preventing data loss and maintaining time accuracy.

Materials

Phosphor bronze contacts with gold plating (typically 0.3-0.5μm), PBT (Polybutylene Terephthalate) housing (UL94 V-0 rated), nickel-plated steel springs.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Lifespan	>10,000 insertion cycles
Battery Type	CR2032/CR2025 coin cell
Insertion Force	5-15N
Withdrawal Force	1-5N
Contact Resistance	<50mΩ
Insulation Resistance	>100MΩ at 500VDC
Operating Temperature	-40°C to +85°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

IEC 60068-2-27, MIL-STD-202

Parent Products

This component is used in the following industrial products

Real-Time Clock (RTC)

An electronic component that keeps track of the current time and date independently of the main system power.

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Engineering Analysis

Risks & Mitigation

Battery contact corrosion in humid environments
Spring fatigue after repeated battery changes
Intermittent connection due to vibration

FMEA Triads

Trigger: Contact oxidation in high-humidity environments
Failure: Increased contact resistance leading to voltage drop
Mitigation: Use gold-plated contacts and conformal coating on PCB

Trigger: Spring material fatigue
Failure: Reduced contact pressure causing intermittent connections
Mitigation: Implement nickel-plated steel springs with proper tempering

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1mm for contact positioning, ±5% for spring force

Test Method

IEC 60529 for ingress protection, MIL-STD-202 for vibration/shock testing

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Backup Battery Holder

Manufacturer profiles associated with Backup Battery Holder.

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Frequently Asked Questions

What battery types are compatible with standard RTC backup holders?

Most industrial RTC backup holders are designed for CR2032 or CR2025 lithium coin cells, with some models accommodating multiple sizes through adjustable contacts.

How does the holder prevent battery leakage or corrosion?

Gold-plated contacts resist oxidation, while precision spring tension maintains consistent pressure without over-compressing the battery. The PBT housing provides chemical resistance and thermal stability.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Backup Battery Holder