18650 Lithium‑ion Battery Pack, 3.7V High‑Capacity 4000mAh, with Wired Protection Board, for Massagers, Flashlights and Small Appliances

Basic Properties

Place of Origin: Shenzhen, China

Brand Name: MEISAEN

Certification: UN38.3 MSDS IEC62133 CE ROHS

Trading Properties

Minimum Order Quantity: 1000PCS

Payment Terms: T/T

Supply Ability: 100000pcs

18650 lithium battery pack 4000mAh

3.7V lithium-ion battery wired protection

18650 battery for massagers flashlights

Product Description

This 18650‑2P lithium‑ion battery pack delivers 3.7V 4000mAh (14.6Wh) stable power output. Integrated BMS protection safeguards against over‑charging, over‑discharging, over‑current and short‑circuit. Compact size with pre‑wired connector, ready‑to‑use for various portable electronic equipment.

Overview

Our 18650 2P rechargeable lithium‑ion battery pack is assembled with premium 18650 cells, offering reliable 3.7V 4000mAh high‑capacity power supply. Built‑in professional BMS protection circuit ensures safe daily operation, prevents damage caused by abnormal charging & discharging. Pre‑soldered connector saves your welding work, plug‑and‑play for DIY projects and device replacement.

Key Features

✅ Built‑in multi‑protection BMS: Over‑charge, Over‑discharge, Over‑current, Short‑circuit protection

✅ High capacity: 4000mAh, nominal energy 14.6Wh, long cycle life

✅ Standard 18650 2P parallel assembly, stable 0.2C‑1C charge & discharge rate

✅ Pre‑wired connector, easy installation for replacement & DIY builds

✅ Compact outer dimension, lightweight at only 93g±2g

✅ Wide working temperature range for indoor & outdoor portable equipment

Common Applications

Suitable for portable monitors, small speakers, lighting equipment, medical portable devices, smart home gadgets, DIY electronic projects, replacement battery for 3.7V consumer electronics.

Specifications(参数表格,完全取自图片)

表格

Item	Parameter
Battery Model	18650 2P
Nominal Voltage	3.7V
Nominal Capacity	4000mAh
Rated Energy	14.6Wh
Full‑charge Voltage	4.25V
Cut‑off Discharge Voltage	2.75V
Charge Current	0.2C‑1C
Discharge Current	0.2C‑1C
Charge Temperature	0℃‑45℃
Discharge Temperature	0℃‑45℃
Dimension	37.318.566.5 mm
Weight	93g ± 2g
Protection Function	Over‑charge, Over‑discharge, Over‑current, Short‑circuit

Important Notes

Please use dedicated 3.7V lithium‑ion battery charger, do NOT use unqualified power adapter.
Do NOT disassemble, squeeze, puncture or throw battery into fire.
Stop charging once fully charged; avoid deep over‑discharge to extend battery service life.
Please confirm voltage, dimension and connector before purchasing for device replacement.

18650 Lithium‑ion Battery Pack, 3.7V High‑Capacity 4000mAh, with Wired Protection Board, for Massagers, Flashlights and Small Appliances

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