Introduction

3.7V 300mAh Li Polymer Rechargeable Battery features Grade-A cells and precision PCM, providing stable, slim-profile power that solves space constraints and swelling issues in compact wearable electronics.

Specification

Items	Specifications
Batteries	3.7v 300mah lipo battery
Charge voltage	4.2V
Nominal voltage	3.7V
Nominal capacity	1000mAh 0.2C Discharge
Charge current	Standard Charging: 0.5C Rapid charge: 1.0C
Standard Charging Method	0.5C CC (constant current) charge to 4.2V, then CV (constant voltage 4.2V) charge till charge current decline to ≤0.05C
Charging time	Standard Charging: 2.75hours(Ref.) Rapid charge: 2hours(Ref.)
Max. charge current	1.0C
Max. discharge current	1.0C
Discharge cut-off voltage	2.75V(0.2C)
Operating temperature	Charging: 0 °C ~45 °C Discharging:0 °C ~45 °
Storage temperature	-10°C~ +45 °C
Dimension	Length: 50±2mm (not including tabs) Width: 20±0.5mm Thickness:10±0.2mm
Drop Test	The cell is to be dropped from a height of meters twice onto concrete ground. No fire, no leakage
Cycle Life	≥300 times

Key Features

Grade A Cobalt Cells: High-purity cobalt chemistry. Keeps 80%+ capacity after 500 cycles under standard deep discharge testing.

Ultra Low Internal Resistance: Ultrasonic welded tabs reduce contact resistance and heat buildup under load, improving discharge stability in repeated use.

Pressure Relief Venting: Built-in vent structure releases internal gas under abnormal pressure, reducing swelling risk and cell damage.

Minimal Self Discharge: Low-leakage electrolyte formulation keeps voltage stable during long storage and shipping periods.

Customization Options

Cell Dimensions: Adjustable thickness (from 0.8mm), width, and length to fit your specific housing.

Connectors & Leads: Options for JST, Molex, Hirose, or customized wire gauges and lengths.

Protection Circuit (PCM): Customizable over-current thresholds and NTC thermistor integration for thermal monitoring.

Branding & Labeling: Private labeling, custom laser marking, and industrial bulk packaging.

Applications

Wearable Technology: Smartwatches, fitness trackers, smart rings, and VR/AR peripherals.

Audio Devices: TWS earbuds, Bluetooth headsets, and portable MP3/MP4 players.

Medical Devices: Portable pulse oximeters, digital thermometers, and smart hearing aids.

IoT & Smart Home: GPS trackers, smart sensors, and wireless security tags.

Hobbies & Toys: Mini RC drones, electronic gifts, and LED lighting accessories.

Certifications & Compliance

Our manufacturing process complies with UN38.3, RoHS, and REACH standards. Full MSDS documentation and Sea/Air Dangerous Goods test reports are provided to ensure smooth international customs clearance.

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