THOR 301120 3.7V 40mAh lithium polymer battery with PCM protection, red and black lead wires, and 2-pin connector

THOR 301120 3.7V 40mAh LiPo battery dimension drawing showing T×W×L = 3 × 11 × 22 mm (with PCM) and 2-pin connector polarity

301120 LiPo battery application scenarios for portable electronics, smart toys, cameras, speakers, and beauty devices

THOR 301120 3.7V 40mAh lithium polymer battery specifications with dimensions and connector details

Customizable LiPo battery connector and wire harness options, with PH 2.0 mm shown for reference

Lithium polymer (LiPo) battery connector polarity guide showing red positive and black negative wires with correct and incorrect connection examples

THOR lithium polymer (LiPo) battery discharge performance comparison with discharge curves and microscopic electrode material images

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Description

The THOR-301120 is a 3.7V 40mAh lithium polymer (LiPo) battery with connector, sized of T×W×L = 3 × 11 × 22 mm (with PCM). At just 40mAh in a 3mm-thin footprint, this is one of the smallest cells in our range, designed for ultra-compact devices such as TWS earbuds, styluses, smart rings, hearing aids, and miniature IoT sensors.

As a custom LiPo battery manufacturer, THOR Power can customize cell size, capacity, protection circuit (PCM), connector type, and wire harness configuration to match your product requirements. Contact our engineers for prototype samples and production solutions.

Stable 3.7 V nominal output for reliable power delivery
Long cycle life — typically several hundred cycles, cost-efficient
Built-in protection: overcharge, over-discharge, short-circuit
Custom size, capacity, connector & PCM/BMS
UN38.3 / MSDS ready; CE, KC, ROHS on request

Why Choose THOR Power

A vertically integrated lithium battery manufacturer (Dengzhou Xinju New Energy) with the scale and engineering depth to deliver custom LiPo cells reliably at volume.

3 factories, 800+ staff

Source-manufacturer scale — not a trading company.

200+ engineers

R&D led by a chief battery scientist for rapid custom design.

60,000 pouch cells / day

Mostly exported overseas, across the US, Europe, Japan & Korea, SE Asia, Latin America and Africa.

Full certification

UN38.3, MSDS, CE, KC, UL, CB, PSE, RoHS.

Global export

US, Europe, Japan & Korea, SE Asia, Latin America, Africa.

End-to-end quality control

From raw material to finished cell.

Factory Photos

Automation Equipment

Production Line

Testing Equipment

Warehouse & Certifications

Model	THOR-301120
Battery Type	Lithium Polymer (LiPo) pouch cell
Capacity	40 mAh
Certifications	UN38.3 / MSDS (IEC 62133-2, CE, KC on request)
MOQ	From 10 pcs for samples; production quoted per project
Customization	Size, capacity, connector, wire length, PCM/BMS, NTC, label

3.7V 40mAh Lithium Polymer (LiPo) Battery with Connector | THOR-301120

The THOR-301120 is a 40mAh 3.7V lithium polymer battery (3.0×11×20mm), delivering 0.15Wh at ~0.7g. Ultra-compact 3.0mm slim cell for the tightest hearing aid and beacon enclosures. Designed for hearing aids, Bluetooth beacons, smart rings, and miniature IoT sensors. Volumetric density: 0.23 Wh/cm³.

Wholesale Pricing (USD)

Order Quantity	Reference Unit Price
10 – 99 pcs	—
100 – 999 pcs	—
1,000 – 9,999 pcs	—
10,000+ pcs	Contact for best price

Reference pricing for this model is being finalised. Talk to a Battery Engineer for a same-day quote.

Prices are for standard configuration reference only. Final pricing may vary by cell size, capacity, connector, wire length, PCM/BMS, label, packaging, certification requirements, and order quantity. Shipping cost is not included. MOQ: from 10 pcs for samples; production quantities are quoted per project.

Get an Engineering Quote

Custom sizes, capacities, connectors & PCM/BMS available. MOQ-friendly. Samples in days.

Battery Specification — THOR-301120

Mechanical Characteristics

Model	THOR-301120
Cell Type	Lithium Polymer (LiPo) pouch cell
Configuration	1S1P (customizable)
Dimensions (T×W×L)	3 × 11 × 20 mm (bare cell)
Dimension Tolerance	Thickness ±0.2 mm; Width/Length ±0.5 mm
With PCM Board	Length approx. +2 mm vs bare cell
Weight	Approx. 1 g
PCM / BMS	Included (standard)
NTC Thermistor	Optional
Connector	PH2.0 / Molex 1.25 (custom available)
Wire Length	Customizable
UN38.3	Test Summary available
Safety Data Sheet	SDS / MSDS available
IEC 62133-2	Available for selected models
RoHS / REACH	Compliance documents available

Electrical Specifications

Nominal Voltage	3.7 V
Rated Capacity	40 mAh
Energy	0.15 Wh
Charge Voltage	4.20 ± 0.03 V
Standard Charge	8 mA (0.2C), CC/CV to 4.20 V
Charge Cut-off Current	0.02C
Max. Charge Current	40 mA (up to 1C), model-specific
Discharge Cut-off Voltage	3.0 V
Standard Discharge	8 mA (0.2C)
Max. Continuous Discharge	40 mA (1C), model-specific
Internal Resistance	≤ 160 mΩ (1 kHz, 50% SOC, 25℃)
Cycle Life	≥ 500 cycles, ≥ 80% capacity
Cycle Test Condition	0.5C charge / 0.5C discharge, 3.0-4.2 V, 25 ± 2℃
Charge Temperature	0℃ ~ 45℃
Discharge Temperature	-20℃ ~ 60℃
Storage Temperature	-10℃ ~ 45℃ (≤ 1 month)
Capacity Retention	≥ 90% after 28 days @ 25℃
Note	Higher discharge-rate designs available upon engineering review

Protection Circuit (when PCM equipped)

Overcharge Detection	4.28 ± 0.03 V per cell
Overcharge Release	4.08 ± 0.05 V
Over-discharge Detection	2.75 ± 0.05 V
Over-discharge Release	3.00 ± 0.05 V
Overcurrent Protection	Per PCM design (2A ~ 5A typical)
Short-circuit Protection	Yes, auto-recovery

Values shown are THOR Power standard specifications for this cell class. Final parameters are confirmed in the engineering datasheet for your configuration.

Typical Applications — 3.7V 40mAh

GPS TrackersReliable runtime for asset, vehicle, and personal location trackers.

Wearables & SmartwatchesSlim, lightweight power for fitness bands and smartwatches.

Medical DevicesStable, safe output for monitors, thermometers, and handheld diagnostics.

IoT ModulesLong standby power for connected sensors and smart devices.

Bluetooth & AudioCompact power for earbuds, speakers, and wireless audio gear.

Portable ElectronicsCameras, handhelds, and consumer gadgets needing a slim cell.