3.7V 502530 300mAh Lithium Ion Polymer Battery with PCB
Summary of 502530 300mAh Lithium Ion Polymer Battery
The 3.7V 502530 300mAh Lithium Ion Polymer Battery with PCB is a compact, lightweight, and high-performance rechargeable battery designed for small electronic devices. Despite weighing only 9 grams (including the protection board), it delivers remarkable energy density and reliable long-lasting power. With built-in PCB protection, it ensures safety against overcharge, over-discharge, overcurrent, short circuit, and overheating. After 500 deep charge/discharge cycles, the battery still retains over 80% of its original capacity (240mAh+). Combined with a wide operating temperature range (-20°C to +65°C) and customization options for OEM projects, it’s the ideal power solution for compact, energy-efficient electronics.
502530 Battery 300mAh Technical Information
Model: 3.7V 502530
Battery Type: Rechargeable Li-Polymer Battery
Nominal Capacity: 300mAh
Nominal Voltage: 3.7V
Nominal Energy: 1.11Wh
Energy Density: 123.33 Wh/kg
Charge Cut-off Voltage: 4.2V
Discharge Cut-off Voltage: Typically 3.0V, Minimum 2.75V
Standard Charge Current: 0.2C (60mA)
Max Charge Current: 1C (300mA)
Standard Discharge Current: 0.2C (60mA)
Max Continuous Discharge Current: 1C (300mA)
Max Peak Discharge Current: 2C (600mA)
Internal Resistance: Less than 120mΩ
Cycle Life: More Than 500 Times
Dimensions: 5 × 25 × 30 mm
Weight: 9g
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
PCB: Yes
Connector: Bare wires or optional with JST, Molex etc
Key Features — 3.7 V 502530 Battery
⚡ High Energy Density & Compact Design
The 502530 Li-ion Polymer battery offers outstanding energy-to-weight performance in a small, space-efficient package, making it ideal for compact devices where power and portability matter most. Its small form factor allows easy integration into devices with tight battery compartments, such as smart gadgets, mini sensors, and wearable products.
🛡️ Built-in Protection Circuit (PCB) for Safety
Safety and reliability are built into every cell. The integrated protection circuit board (PCB) provides multi-level safeguards to ensure long-term stable performance:
✅ Overcharge protection to prevent voltage overload.
✅ Over-discharge protection for enhanced cell life.
✅ Overcurrent protection against sudden power spikes.
✅ Short-circuit protection ensuring operational safety.
✅ Over-temperature protection maintaining stability under extreme conditions.
🔁 Long Cycle Life with Excellent Capacity Retention
Engineered for endurance, the 502530 Li-Polymer battery maintains high performance over hundreds of cycles, This reliability ensures long-term power stability, making it a trusted energy source for continuous-use consumer electronics.
🔋 500+ deep cycles while retaining over 240mAh (80% capacity).
🔄 Low internal resistance for steady energy output.
⚡ Consistent voltage curve ensures smooth device operation.
🌡️ Wide Operating Temperature Range
The wide temperature tolerance (-20°C to +65°C) ensures dependable performance across varied environments — from cold outdoor conditions to warm indoor applications. Perfect for IoT devices, portable trackers, medical wearables, and other applications exposed to changing conditions.
⚙️ Customizable to Meet OEM Requirements
Cestpower provides comprehensive customization options to match specific project needs, Our expert engineering team ensures every 502530 Li-ion Polymer battery fits seamlessly into your device — combining performance, safety, and design flexibility.
📐 Custom dimensions and shapes for compact spaces.
⚡ Adjustable capacities and voltages.
🔌 Various terminals and connectors available.
🏷️ OEM branding and private labeling supported.
💼 Applications
The 3.7V 502530 300mAh Li-Polymer Battery with PCB is perfectly suited for:
Wearable smart devices
Portable medical instruments
IoT sensors and data loggers
Bluetooth modules and beacons
Mini consumer electronics
❓ FAQ – Frequently Asked Questions
Q1: What charging precautions should be followed?
A: Always use a constant current–constant voltage (CC-CV) charger. Avoid charging above 4.2V, and ensure ambient temperature stays within 0°C to 45°C during charging for safety and longevity.
Q2: Does the battery have built-in safety features?
A: Yes, it includes a protection circuit (PCB) with overcharge, over-discharge, overcurrent, short circuit, and over-temperature protections.
Q3: What is the typical discharge rate (C-rate) for this battery?
A: The standard continuous discharge rate is around 0.5C–1C, depending on the application. Higher C-rate versions can be customized upon request.
Q4: What certifications are available for this battery?
A: Depending on customer needs, the 502530 Li-Polymer battery can be supplied with UN38.3, MSDS, RoHS, and CE certifications to meet international transport and compliance standards.
Q5: Does Cestpower provide technical support for battery integration?
A: Yes. Our engineers provide OEM/ODM technical assistance, including battery selection, circuit design, and connector matching, to ensure perfect compatibility with your product.
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