The Varta 55615702012 MemPac Rechargeable NiMH Button Cell 150mAh 24V is a compact power solution designed for demanding backup and memory applications. This small-format battery combines nickel metal hydride chemistry with button-cell packaging to support reliable energy delivery in specialized devices.
Engineered for long cycle life and stable performance, this cell is commonly selected by system designers who need a dependable 24V memory backup source with a form factor that fits tight enclosures.
| Product Identifier | Key Specification | Value | Notes |
|---|---|---|---|
| Model | Varta 55615702012 | MemPac Rechargeable NiMH Button Cell | Factory-sealed button-cell format |
| Chemistry | Nickel Metal Hydride (NiMH) | Rechargeable | Memory-friendly chemistry with low self-discharge |
| Capacity | Rated Capacity | 150 mAh | Typical capacity at C/5 discharge rate |
| Nominal Voltage | Cell Voltage | 24 V | Designed for 24V memory backup systems |
| Application | Primary Use Case | Memory Backup & RTC | Maintains CMOS memory and real-time clock during main-power interruption |
Reliability in Memory Backup Applications
In critical systems where power interruptions must not corrupt settings, the Varta 55615702012 MemPac delivers consistent backup energy. Designers value the predictable discharge behavior of NiMH chemistry in roles such as memory backup for instrumentation, industrial controllers, and communication modules. Because the button-cell format fits densely populated PCBs, this cell is a practical choice when board space is at a premium.
Charging and Maintenance Guidelines
Proper charging is essential to maximize cycle life and avoid cell stress. This 150 mAh NiMH button cell benefits from controlled current profiles that respect its energy capacity and internal resistance. When implemented with appropriate charge termination and protection features, the Varta MemPac maintains stable voltage and retains capacity over many recharge cycles.
Environmental and Operational Considerations
Operating temperature range and storage conditions influence the performance and longevity of rechargeable button cells. Engineers should evaluate the expected ambient temperatures and charge intervals for their application to ensure that the Varta 55615702012 MemPac performs as specified. Avoiding prolonged exposure to high temperatures or deep discharge states helps preserve capacity retention over the product lifecycle.
Specifications and Performance Overview
Understanding the electrical and mechanical characteristics of this cell enables correct system integration. Key parameters such as capacity, voltage, internal resistance, and dimensions define how the battery interacts with the host circuit and enclosure design.
Performance Specifications
| Parameter | Typical Value | Unit | Condition |
|---|---|---|---|
| Cell Capacity | 150 | mAh | C/5 discharge, 20–25°C |
| Nominal Voltage | 24 | V | Multiple-cell stack target |
| Internal Resistance | Variable | mΩ to Ω range | Depends on cell stack and protection circuitry |
| Max Charging Current | Limited | mA | Recommended by application circuit design |
| Cycle Life Expectancy | High | Cycles | Hundreds of cycles at proper charge conditions |
Installation and Compatibility Guidance
Mechanical fit and electrical compatibility are vital when retrofitting or designing new modules around the Varta 55615702012 MemPac. Verify connector types, terminal polarity, and available volume before committing to a final bill of materials. Consulting the device vendor ensures that this button cell meets the intended system requirements without requiring mechanical redesign.
Key Takeaways and Implementation Recommendations
- Confirm system compatibility with the 24V nominal output and button-cell form factor
- Follow manufacturer-recommended charge profiles to maximize cycle life
- Monitor temperature and avoid deep discharge whenever possible
- Validate enclosure space and connector alignment before finalizing the design
- Leverage the NiMH chemistry for reliable memory backup with low self-discharge
FAQ
Reader questions
Can this battery be used as a direct replacement for a primary 24V button cell in legacy equipment?
Yes, in applications where the original cell provided 24V and sufficient capacity for memory backup, the Varta 55615702012 MemPac can serve as a rechargeable replacement. Confirm connector dimensions and charging availability within the existing system to ensure safe integration.
What is the expected cycle life under normal backup conditions?
With controlled charge current and proper termination, this NiMH button cell can deliver hundreds of full cycles while retaining the majority of its rated capacity. Actual life varies with temperature, depth of discharge, and charging regimen.
How should I manage charging to avoid overstress?
Use a charger designed for NiMH batteries with current limits suitable for a 150 mAh cell, and include temperature and voltage monitoring when possible. Avoid trickle charging at very high current for extended periods to preserve long-term reliability.
Is this cell suitable for high-vibration or mobile environments?
The button-cell construction and solid-state NiMH chemistry provide robustness for demanding environments, but mechanical mounting and shock protection should be evaluated based on the specific application and shock profiles.