3.7V 502030 250mAh Lithium Ion Polymer Battery with PCB
Summary of Battery 502030 250mah 37V
The 3.7V 502030 250mAh Lithium Ion Polymer Battery with PCB is an eco-friendly, ultra-thin, and high-performance rechargeable battery designed for compact electronic devices that demand long-lasting, sustainable power. With a thickness of only 5.0mm, this lightweight Li-Polymer battery easily fits into slim and space-limited enclosures, providing reliable 250mAh capacity for extended operation. It is free from toxic heavy metals such as lead, mercury, and cadmium, making it a green and environmentally safe energy solution.
Equipped with a built-in protection circuit board (PCB), the battery offers comprehensive overcharge, over-discharge, overcurrent, and short-circuit protection. With over 500 charge cycles and ≤1% self-discharge per month, it maintains over 80% power retention even after long storage periods — ideal for seasonal or backup electronic products. Supporting 1C fast charging (fully charged in ~1.5 hours) and wide temperature operation (-20°C to +60°C discharge), it’s engineered for durability, safety, and energy efficiency in diverse environments.
502030 Battery Technical Information
Model: 502030
Battery Type: Li Polymer Battery
Nominal Capacity: 250mAh
Nominal Voltage: 3.7V
Nominal Energy: 0.925Wh
Energy Density: 123Wh/kg
Charge Cut-off Voltage: 4.2V
Discharge Cut-off Voltage: Typically 3.0V, Minimum 2.75V
Standard Charge Current: 0.2C (50mA)
Max Charge Current: 1C (250mA)
Standard Discharge Current: 0.2C (50mA)
Max Continuous Discharge Current: 1C (250mA)
Max Peak Discharge Current: 2C (500mA)
Internal Resistance: Less than 120mΩ
Cycle Life: More Than 500 Times
Dimensions: 5 × 20 × 30 mm
Weight: 7.5g
Charge Temperature Range: 0°C to 45°C
Discharge Temperature Range: -20°C to 65°C
Storage Temperature Range:
- -20℃~25℃: More than 12 months
- -20℃~45℃: Less than 3 months
- -20℃~60 ℃: Less than 1 month
Key Features — 502030 Battery
🌿 Green & Eco-Friendly Power Solution
The 502030 Li-Polymer battery embodies sustainability and environmental responsibility. Perfect for manufacturers seeking eco-conscious energy sources without compromising performance.
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Contains no harmful metals — completely lead-, mercury-, and cadmium-free.
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Complies with RoHS and green energy standards, supporting clean energy initiatives.
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Recyclable materials and low environmental impact design.
⚡ Ultra-Thin, Lightweight, and Space-Saving Design
Engineered for compact devices, this 5.0mm-thin Li-Polymer cell provides excellent energy density in a lightweight and compact form. Its slim and flexible design enables seamless integration into smart wearables, portable IoT devices, medical instruments, and miniature wireless modules.
🛡️ Built-in PCB for Safety & Reliability
The integrated protection circuit board (PCB) ensures safe and efficient battery operation. These features make the battery both safe and maintenance-free, ideal for consumer electronics and professional equipment.
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✅ Overcharge protection prevents cell damage.
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✅ Over-discharge protection extends battery lifespan.
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✅ Overcurrent and short-circuit protection safeguard connected devices.
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✅ Stable polymer electrolyte reduces leakage and swelling risks.
🔁 High Cycle Life & Low Self-Discharge
Built with advanced polymer materials, this battery delivers outstanding endurance and stability:
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500+ deep charge/discharge cycles with ≥200mAh remaining capacity.
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Self-discharge ≤1% per month, maintaining over 80% charge after months of storage.
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Perfect for seasonal products, backup systems, and long-shelf-life devices.
⚡ Fast Charging & Wide Temperature Range
Designed for convenience and versatility. The 502030 battery performs reliably in both cold and warm climates, ideal for outdoor sensors, smart tags, and handheld instruments used in diverse environments.
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Supports 1C charging rate — full charge in about 1.5 hours.
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Discharge temperature: -20°C to +60°C
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Charging temperature: 0°C to +45°C
🧩 Customizable for OEM Applications
Cestpower offers complete OEM and customization services for this battery type:
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Custom dimensions, capacities, and voltages
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Connector and wire customization for easy integration
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OEM/ODM branding and labeling options
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Battery pack combinations for larger capacity needs
💼 Typical Applications
The 3.7V 502030 250mAh Li-Polymer Battery with PCB is ideal for:
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Smart wearable devices
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IoT modules and sensors
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GPS trackers and Bluetooth devices
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Portable medical and health monitors
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Compact consumer electronics
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Backup or seasonal-use electronics
❓ FAQ – Frequently Asked Questions
Q1: What makes this battery eco-friendly?
A: It’s lead-, mercury-, and cadmium-free, meeting RoHS environmental standards, and built with recyclable materials for sustainable energy use.
Q2: Does the battery include built-in protection?
A: Yes, it has a protection circuit board (PCB) with overcharge, over-discharge, overcurrent, and short-circuit protection.
Q3: How fast can it be fully charged?
A: The battery supports 1C charging, achieving full charge within approximately 1.5 hours under proper charging conditions.
Q4: What is the recommended operating temperature range?
A: The discharge range is -20°C to +60°C, and the charging range is 0°C to +45°C, ensuring stable operation in diverse climates.
Q5: What devices commonly use this model?
A10: It’s popular in wearable health trackers, IoT sensors, GPS beacons, smart pens, and compact Bluetooth devices.
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