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

THOR-401020 provides 55mAh in a very small 4 × 10 × 20mm bare-cell envelope. THOR-351020 uses the same 10 × 20mm footprint and capacity with 0.5mm less nominal thickness. Both belong to the same 55mAh footprint family; final selection should consider production availability, finished configuration and project-specific validation rather than an unproven performance advantage. THOR-401220 keeps 4mm thickness and 20mm length but uses 12mm width to provide 70mAh.

The 4 × 10 × 20mm value is the nominal bare-cell envelope. A typical PCM-equipped assembly is approximately 4 × 10 × 22mm, but PCM placement, insulation, lead exit, connector body and wire routing can change the final envelope. Designs requiring a thinner cell should be evaluated as a separate custom battery project.

At 3.7V nominal and 55mAh, THOR-401020 stores approximately 0.20Wh and uses the standard 1S 4.2V full-charge system. Runtime is strongly influenced by standby drain, radio or sensor duty cycle, regulator efficiency, cutoff voltage, temperature and aging. Continuous and peak-current suitability should be confirmed against the final cell, PCM, wire, connector and device load profile.

THOR-401020 Engineering & Fit Questions

How does THOR-401020 compare with THOR-351020?

THOR-351020↗ uses the same 10 × 20mm footprint and 55mAh capacity with 0.5mm less nominal thickness. Both models belong to the same 55mAh footprint family; select according to production availability, finished configuration and project-specific validation rather than an assumed performance advantage.

Are 4 × 10 × 20mm the finished THOR-401020 dimensions?

No. They are nominal bare-cell dimensions. A typical PCM-equipped assembly is approximately 4 × 10 × 22mm, but insulation, connector body, lead exit and wire routing can require additional clearance.

What should be validated for a 55mAh THOR-401020 design?

Measure standby drain, active duty cycle, pulse demand, regulator efficiency, cutoff voltage and temperature behavior in the final device. Confirm continuous and peak-current suitability with the intended PCM, wire and connector before sample approval.

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

High-volume manufacturing with products exported across the US, Europe, Japan & Korea, SE Asia, Latin America and Africa.

End-to-end quality control

From raw material to finished cell.

Factory Photos

Automation Equipment

Testing Equipment

Warehouse & Certifications

Model	THOR-401020
Battery Type	Lithium Polymer (LiPo) pouch cell
Capacity	55 mAh
Certifications	UN38.3 / MSDS (IEC 62133-2, CE, KC on request)
MOQ	10 pcs (samples available)
Customization	Size, capacity, connector, wire length, PCM/BMS, NTC, label

3.7V 55mAh Lithium Polymer (LiPo) Battery with Connector | THOR-401020

Name: 3.7V 55mAh Lithium Polymer (LiPo) Battery with Connector | THOR-401020
Brand: THOR Power
SKU: THOR-401020

THOR-401020 is a 3.7V 55mAh LiPo pouch cell with approximately 0.20Wh nominal energy and a 4 × 10 × 20mm bare-cell envelope. Its defining feature is the micro 10 × 20mm footprint at 4mm nominal depth. It may suit miniature wireless sensor or in-ear electronic modules only after standby drain, pulse load and the finished-pack envelope are validated.

Get an Engineering Quote

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

Battery Specification — THOR-401020

Mechanical Characteristics

Model	THOR-401020
Cell Type	Lithium Polymer (LiPo) pouch cell
Configuration	1S1P (customizable)
Dimensions (T×W×L)	4 × 10 × 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. 2 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	55 mAh
Energy	0.2 Wh
Charge Voltage	4.20 ± 0.03 V
Standard Charge	11 mA (0.2C), CC/CV to 4.20 V
Charge Cut-off Current	0.02C
Max. Charge Current	55 mA (up to 1C), model-specific
Discharge Cut-off Voltage	3.0 V
Standard Discharge	11 mA (0.2C)
Max. Continuous Discharge	55 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 — THOR-401020

Miniature Wireless Sensor Nodes — PrimaryThe 10 × 20mm footprint can suit miniature sensor nodes where standby drain, radio pulses and the protected-pack envelope are validated for the complete device.

In-Ear Audio & Hearing Device ModulesTHOR-401020 may suit very small rechargeable audio electronics that can accommodate 4mm nominal cell thickness plus project-specific protection, leads and connector clearance.