When a backup battery is installed inside railway equipment or other critical industrial systems, reliability is not simply about rated capacity. The battery must remain stable across temperature changes, repeated charging and discharging, vibration, moisture and long standby periods.
This 24V 14Ah NiMH battery pack uses a 20S1P configuration of industrial NiMH cells, delivering 336Wh of nominal energy. Its chemistry is well suited to applications where stable rechargeable power and robust environmental performance are more important than simply pursuing maximum energy density.
The pack is enclosed in a customized UL94 V-0 ABS and PC housing with IP65 protection. Inside, the cells are mechanically supported with silicone cushioning, while welded nickel-copper composite busbars help provide a secure current path. A dedicated monitoring and protection PCB adds temperature, voltage and current supervision, while RS485 Modbus-RTU enables communication with the host equipment.
For engineers specifying backup power, this architecture provides a practical balance between NiMH chemistry, mechanical protection and system-level monitoring.
🛡️ Engineered Around Real Industrial Conditions
Industrial battery design is often decided by the details that are easy to overlook. A railway or backup power system may spend long periods in standby, then require dependable output immediately when the primary power source becomes unavailable. Temperature, enclosure protection, connector reliability and charging control therefore become part of the battery solution rather than separate considerations.
This pack supports 28A continuous discharge and up to 42A peak discharge for short-duration loads. The specified operating range is 0°C to +45°C during charging and -20°C to +65°C during discharge. The enclosure uses a UL94 V-0 material system and is designed for IP65-level protection.
For system integration, the Amphenol/Harting 4-pin IP67 connector provides the power and communication interface. RS485 Modbus-RTU supports communication at up to 9600 bps, while monitored parameters include total voltage, current, temperature extremes, SoC and SoH estimation, as defined by the battery electronics.
The finished pack is specified for IP65 water and dust testing, 1.5 m drop testing, -40°C to +85°C thermal shock cycling, 48-hour salt spray testing and swept-frequency vibration testing. The design references IEC 62133-1, EN 50155 and UL 2054 requirements, with CE and RoHS compliance requirements considered during production.
Specifications
24V 14Ah NiMH Battery Pack
Battery Chemistry
Nickel-Metal Hydride (NiMH)
Nominal Voltage
24.0 V
Nominal Capacity
14,000 mAh / 14 Ah
Nominal Energy
336 Wh
Cell Configuration
20S1P
Cell Nominal Voltage
1.2 V
Continuous Discharge Current
28 A
Peak Discharge Current
42 A, up to 10 seconds
Standard Charging Current
Standard Charging Current 7 A
Charge Termination
NiMH-specific -ΔV and dT/dt control
Discharge Cut-off Voltage
20.0 V
Charge Cut-off Voltage
29.0 V
Internal Resistance
≤240 mΩ
Standby Current
400 mA
Enclosure Material
ABS + PC
Flame Rating
UL94 V-0
Ingress Protection
IP65
Approximate Dimensions
Approximate Dimensions 365 × 85 × 105 mm
Power Connector
Amphenol/Harting 4-Pin IP67
Frequently Asked Questions
A suitable NiMH battery is not selected by voltage and capacity alone. Cell configuration, charging method, temperature range, mechanical protection, communication interface, discharge requirements and system integration all affect real-world performance. The following questions address the practical considerations engineers and purchasing teams usually evaluate before specifying a custom NiMH battery pack.
Why use a 24V NiMH battery instead of a lithium battery for railway or industrial backup power?
NiMH can be attractive in applications where stable rechargeable performance, mature nickel-based chemistry and robust operating characteristics are more important than maximum energy density. It is particularly relevant where the battery operates as a backup source and must tolerate long standby periods and controlled charging. The final chemistry selection should always be based on the equipment’s temperature, charging and discharge requirements.
How is a 24V NiMH battery pack configured?
A 24V nominal NiMH battery pack is typically built from 20 series-connected 1.2V nominal cells. This product uses a 20S1P configuration, giving a nominal voltage of 24V. With a rated capacity of 14Ah, the nominal energy is approximately 336Wh.
How is NiMH charging controlled in this battery pack?
NiMH charging requires a charging strategy designed around nickel chemistry rather than a lithium-ion CC/CV profile. Depending on the charging system, termination can use parameters such as negative delta voltage, temperature rise, maximum temperature and charging time. This pack specifies 7A charging with NiMH-specific -ΔV and dT/dt termination criteria.
What information can the RS485 interface provide?
The integrated monitoring PCB supports RS485 Modbus-RTU communication with the host system. According to the specified configuration, monitored information includes total battery voltage, total current, highest and lowest battery temperature, SoC estimation, SoH estimation and over-current or over-temperature status.
Can this 24V NiMH battery be customized for railway and industrial equipment?
Yes. As an OEM/ODM battery manufacturer, HIMAXBATT can customize the NiMH cell configuration, capacity, enclosure dimensions, connector, cable length, monitoring PCB, communication interface and mechanical structure according to the host equipment. Before production, the battery specification should be matched with the equipment’s charging profile, current demand, installation space and environmental requirements.
