products details

Home > Products >

Lithium Polymer Battery Cell

Flat Lithium Battery Cell 502040 3.7v 400mAh Rechargeable Li-ion Polymer Battery Packs

All Category

RC Accessories

Mrs. Alice

alice@szresky.com

0086 13530058480

0086 13530058480

Contact Now

Flat Lithium Battery Cell 502040 3.7v 400mAh Rechargeable Li-ion Polymer Battery Packs

Brand Name:	RESKY
Model Number:	LP502040
MOQ:	100pcs
Price:	Negotiable
Packaging Details:	Paper box
Payment Terms:	T/T,Western Union

Detail Information

Product Description

Ratings & Reviews

Detail Information

Place of Origin:

China

Certification:

MSDS, Un38.3,CE, ROHS, REACH, IEC62133 ect

Model NO.:

LP502040

Nominal Capacity:

400mAh

Weight:

10PCS

Cycle Life:

500cycles

Warranty:

12months

Shipping:

UPS, DHL, FedEx, TNT, By Air, By Sea, Special Line

Lead Time:

3-7workdays

Connector:

Jst, Molex....

Specification:

5*20*40mm

Supply Ability:

50000pcs/day

Highlight:

502040 lithium polymer battery

3.7v rechargeable battery cell

400mAh flat li-ion battery

Product Description

Flat Lithium Battery Cell 502040 3.7v 400mAh Rechargeable Li-ion Polymer Battery Packs

High-performance 3.7V 400mAh 1.48Wh rechargeable Li-polymer battery cell designed for compact electronic devices requiring reliable power in limited space.

Technical Specifications

Parameter	Specification
Battery Type	3.7V 400mAh Li-polymer
Charge Voltage	4.2V
Nominal Voltage	3.7V
Nominal Capacity	400mAh (0.2C Discharge)
Charge Current	Standard: 0.5C (200mA) Rapid: 1.0C (400mA)
Charging Method	0.5C CC to 4.2V, then CV until current ≤0.05C
Charging Time	Standard: ~2.75 hours Rapid: ~2 hours
Max Charge Current	1.0C (400mA)
Max Discharge Current	1.0C (400mA)
Discharge Cut-off Voltage	2.75V ±0.25V (0.2C)
Operating Temperature	Charging: 0°C to 45°C Discharging: 0°C to 45°C Storage: -10°C to 45°C
Dimensions	Length: 40±2mm Width: 20±0.5mm Thickness: 5±0.2mm
Cycle Life	≥500 cycles

Advantages:

Miniaturization and Lightweighting: Lightweight and compact batteries are ideal for space- and weight-sensitive applications, such as smart wearable devices or portable electronics.

Design Flexibility: Can be manufactured in any shape and thickness, and is even flexible (maximum bending angle approximately 900 degrees), meeting the styling requirements of complex devices.

Enhanced Safety: The gel electrolyte reduces the risk of leakage and explosion; internal problems are typically indicated by bulging packaging, enhancing reliability.

Capacity and Voltage Advantages: Higher capacity for the same size compared to traditional lithium-ion batteries, and high voltage per cell contributes to improved system efficiency.

Environmental Adaptability: Wide operating temperature range (e.g., -40°C to 70°C), suitable for extreme environmental conditions.

Structural & Safety Features

Electrode System: NCM/NCA ternary cathode material with graphite anode
Packaging: Aluminum-plastic composite film soft-pack with flexibility (bending radius ≥5mm)
Electrolyte: Polymer gel electrolyte with superior thermal stability and no leakage risk
Safety Protection: Built-in PCM module for overcharge, over-discharge, overcurrent, and short circuit protection
Drop Test Certified: Withstands 1-meter drops onto concrete without fire or leakage

Primary Applications

Smart Wearables & Children's Products

Entry-level smart bracelets and watches (1-3 day battery life)
Children's phone watches, smart toy watches, GPS bracelets
Mini heart rate monitors, pedometers, cycling speed sensors

Medical & Health Equipment

Portable diagnostic devices: electronic thermometers, oximeters, blood pressure monitors
Rehabilitation aids: mini massagers, physiotherapy devices, hearing aids

IoT & Smart Home Devices

Low-power sensors: temperature/humidity, door/window, smoke detectors
Small smart home devices: smart door locks, mini cameras, wireless remotes

Product Images

Flat Lithium Battery Cell 502040 3.7v 400mAh Rechargeable Li-ion Polymer Battery Packs 0

Flat Lithium Battery Cell 502040 3.7v 400mAh Rechargeable Li-ion Polymer Battery Packs 1

Flat Lithium Battery Cell 502040 3.7v 400mAh Rechargeable Li-ion Polymer Battery Packs 2

Flat Lithium Battery Cell 502040 3.7v 400mAh Rechargeable Li-ion Polymer Battery Packs 3

Flat Lithium Battery Cell 502040 3.7v 400mAh Rechargeable Li-ion Polymer Battery Packs 4

Ratings & Review

Overall Rating

5.0

Based on 50 reviews for this supplier

Rating Snapshot

The following is the distribution of all ratings

5 stars

100%

4 stars

3 stars

2 stars

1 stars

All Reviews

Andrius

Lithuania Apr 16.2025

Helpful (3000)

High quality, working well on our portable medical devices, Resky is a reliable supplier for lithium battery

Maroun

France Aug 17.2023

Helpful (7900)

We cooperated several lipo battery cell models, they are working very well. Recommened.

SIRIEYS

France Jul 19.2023

Helpful (1w+)

After many discharging/charging cycles of the samples LP604070 2000mah you sent…..we are satisfied !

Tags:

Lithium Polymer Battery Cell

RC Lithium Battery

Li-Ion Battery Pack

Lithium Polymer Battery Pack

Heated Lithium Battery

Electric Bike Battery

RC Balance Charger

Rechargeable Battery Charger

RC Accessories

Lithium Polymer Battery Cell

RC Lithium Battery

Li-Ion Battery Pack

Lithium Polymer Battery Pack

Heated Lithium Battery

Electric Bike Battery

RC Balance Charger

Rechargeable Battery Charger

RC Accessories

products details

Lithium Polymer Battery Cell

RC Lithium Battery

Li-Ion Battery Pack

Lithium Polymer Battery Pack

Heated Lithium Battery

Electric Bike Battery

RC Balance Charger

Rechargeable Battery Charger

RC Accessories

Flat Lithium Battery Cell 502040 3.7v 400mAh Rechargeable Li-ion Polymer Battery Packs

502040 lithium polymer battery

3.7v rechargeable battery cell

400mAh flat li-ion battery

Overall Rating

Rating Snapshot

All Reviews