3.7V 55mAh Ultra-Thin LiPo Battery Pack
When making small smart devices like medical wearables, Bluetooth modules, and tiny IoT sensors, they have to deal with limited space and higher standards for safety, reliability, and long life. Normal lithium batteries are either too thick, can’t work with special housings, or can’t keep their performance stable when the temperature changes. To address these challenges, CM Batteries engineered a 3.7V 55mAh ultra-thin lithium battery pack with a maximum thickness of only 2.5mm, delivering a stable and safe power supply for miniaturized electronics while meeting the customer’s mechanical and functional requirements.
Key features：
- Ultra-Thin Custom Structure (2.5mm Max Thickness). Customized the width, thickness, and length (2.5 × 14 × 16 mm) to fit the device’s internal structure perfectly.
- Optimized Cell Chemistry for Mini Devices. Delivered a 3.7V 55mAh cell with high energy density suitable for space-restricted applications.
- Reliable Performance Over 300 Cycles. Ensured ≥70% remaining capacity after 300 cycles, exceeding common standards for miniature lithium batteries.
- Wide Operating Temperature Range. Worked reliably between –20°C to 60°C (discharge) and 0°C to 45°C (charge).
- Certification-Ready Design. Battery structure, materials, and protection configurations aligned with IEC/UN requirements.
| No. | Item | Parameter | Remark |
|---|---|---|---|
| 1 | Nominal Voltage | 3.7V | 3.7V/Cell |
| 2 | Nominal Capacity | 0.055Ah | @0.2C |
| 3 | Minimum Capacity | 0.050Ah | / |
| 4 | Shipment Voltage | / | / |
| 5 | Initial Internal Impedance | ≤600mΩ | AC 1KHZ |
| 6 | Standard Charge Voltage | 4.2V | 4.2V/Cell |
| 7 | Standard Charge Current | 0.011A | @0.2C |
| 8 | Max. Charge Current | 0.028A | |
| 9 | Standard Discharge Current | 0.011A | @0.2C |
| 10 | Max. Discharge Current | 0.055A | / |
| 11 | Burst Discharge Current | 0.5-1.4A | ≤10ms |
| 12 | Discharge Cut-off Voltage | 2.8V | 2.8V/Cell |
| 13 | Cycle Life | ≥300 cycles | Retention: ≥70% |
| 14 | Charge Temperature | 0°C~45°C | Standard Charge |
| 15 | Discharge Temperature | -20°C~60°C | Standard Discharge |
| 16 | Storage Temperature | -10°C~45°C | ≤3 Months |
| -10°C~25°C | ≤1 Year | ||
| 17 | Weight | About 0.002 | kg |
3.7V 55mAh Lipo Battery Pack FAQs
Can this battery be redesigned to fit a different shape or thickness?
Yes. CM Batteries can re-engineer the cell’s thickness, width, length, connector type, cable configuration, and PCM to match your device requirements.
What if my device requires the batteries needs special certifications?
CMB can support certification preparation for IEC62133, UN38.3, and transportation requirements. The battery design can be optimized to meet global market compliance.
Is the 2.5mm thickness the thinnest option available?
CMB offers multiple ultra-thin LiPo formats. In many cases, thickness can be further reduced depending on power requirements and mechanical constraints.
How stable is the performance in low temperatures?
The battery is designed to discharge safely at –20°C, making it suitable for outdoor wearables, sensors, and IoT devices.
Can this battery support mass production?
Yes. The design is fully scalable for mass production with consistent quality control and structural stability.
Tailored Customization
Our design team can create custom battery designs for just about any device or machine.
Timely Delivery
Our efficient production and distribution process gets your product delivered in a timely manner.
Quality Guarantee
We stand by our products and guarantee you’ll be happy with your purchase.
