LiFePO4 Battery Packs for Portable Low-Frequency Therapy Devices
Safe, Long-Life, and Stable Power Solutions for TENS & PEMF Systems
Medical Device Battery Solution
Reliable Energy for Low-Frequency Therapy Equipment
Low-frequency therapy devices, including portable TENS (Transcutaneous Electrical Nerve Stimulation) units and PEMF (Pulsed Electromagnetic Field) systems, require highly stable and safe power sources to ensure consistent therapeutic output. These devices are widely used in rehabilitation clinics, physiotherapy centers, and home healthcare environments. Since treatment sessions often last 30–120 minutes and may require repeated daily use, battery reliability directly affects device performance and patient safety.
For OEM manufacturers, selecting the correct battery chemistry is a strategic engineering decision. LiFePO4 Battery Packs have become a preferred solution due to their intrinsic thermal stability, long lifecycle, and stable voltage output. Compared to traditional lithium-ion systems, LiFePO4 chemistry offers superior safety margins, making it particularly suitable for medical and healthcare equipment.
Why LiFePO4 Batteries Are Ideal for Therapy Devices
LiFePO4 (Lithium Iron Phosphate) batteries provide several technical advantages that align with medical device requirements:
| Parameter | LiFePO4 Performance |
|---|---|
| Nominal Voltage (per cell) | 3.2V |
| Typical Pack Voltage | 6.4V / 9.6V / 12.8V |
| Cycle Life | >2000 cycles @80% DOD |
| Thermal Stability | Excellent (low risk of thermal runaway) |
| Operating Temperature | -20°C to +60°C |
| Energy Density | 120–160Wh/kg |
With more than 2000 charge/discharge cycles, LiFePO4 batteries significantly reduce replacement frequency, lowering long-term ownership costs for medical equipment providers. Their flat discharge curve ensures consistent output voltage during therapy sessions, maintaining stable pulse intensity for effective treatment.
Typical LiFePO4 Battery Pack Configuration for Therapy Devices
A commonly used configuration for portable therapy devices is a 12.8V 10Ah or 12.8V 20Ah LiFePO4 battery pack.
| Specification | 12.8V 10Ah | 12.8V 20Ah |
|---|---|---|
| Total Energy | 128Wh | 256Wh |
| Continuous Discharge | 10A | 20A |
| Peak Discharge | 20A | 40A |
| Cycle Life | >2000 cycles | >2000 cycles |
| Protection | Smart BMS | Smart BMS |
These configurations support high-current output for electromagnetic pulse systems while maintaining compact size and medical-grade reliability. For compact wearable or portable units, smaller customized packs are also available through our custom battery pack services.
Power Consumption & Runtime Estimation
Runtime calculation formula:
Runtime (hours) = Battery Energy (Wh) ÷ Device Power (W)
Example: A PEMF therapy device consuming 40W powered by a 12.8V 10Ah pack (128Wh):
128Wh ÷ 40W ≈ 3.2 hours continuous operation
For a 20W TENS unit:
128Wh ÷ 20W ≈ 6.4 hours
This ensures multiple therapy sessions per charge, improving usability for both clinic and home settings.
Engineering & Compliance Advantages
PKNERGY supports therapy device manufacturers with:
- Advanced BMS integration (overcharge, over-discharge, short-circuit, temperature protection)
- Compliance with UN38.3, IEC 62133, CE, and MSDS standards
- Custom pack design for compact enclosures
- End-to-end support from prototype to mass production
With over 20 years of lithium battery manufacturing expertise, PKNERGY delivers safe and scalable energy solutions tailored for medical device OEMs.
Frequently Asked Questions
Why is LiFePO4 safer for medical devices?
LiFePO4 chemistry has superior thermal stability and lower risk of combustion compared to traditional lithium-ion batteries.
How long does a LiFePO4 battery last?
Typically over 2000 charge cycles, significantly longer than standard Li-ion batteries.
Can PKNERGY customize voltage and capacity?
Yes. We provide full customization via our Contact Us page.
Information Sources & References
- IEC 62133 – Secondary Cells and Batteries Safety Standard
- UN38.3 – Lithium Battery Transport Testing Requirements
- Battery University – Lithium Iron Phosphate Technical Overview
- WHO Rehabilitation Device Guidelines
Contact Jennifer — PKNERGY
For customized LiFePO4 battery packs for therapy devices, contact our medical battery specialist.
Email: sale3@pknergy.com
WhatsApp/WeChat: +86 13823598934
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