THOR 302020 3.7V 70mAh lithium polymer battery with PCM protection, red and black lead wires, and 2-pin connector

THOR 302020 3.7V 70mAh LiPo battery dimension drawing showing T×W×L = 3 × 20 × 22 mm (with PCM) and 2-pin connector polarity

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

Choose THOR-302020 when the design demands 100mAh in the thinnest practical 20 × 20mm square geometry. THOR-402020↗ provides the same 100mAh capacity in a 4 × 20 × 20mm cell, adding one millimetre of thickness while sharing the same footprint. If the footprint can extend to 30mm length, THOR-302030↗ delivers 120mAh in a 3 × 20 × 30mm format while maintaining the same ultra-thin 3mm profile. THOR-302020 therefore suits applications where the 20 × 20mm square outline and minimal stack height take priority over extra capacity.

A current custom configuration pairs the bare cell with PCM and NTC in a 3-wire interface, producing a finished length of approximately 22mm with lead wires of approximately 30mm. At 3mm thickness, mechanical integration requires careful attention to the complete assembly envelope. PCM and NTC placement extends the finished dimensions, and short-lead routing in a thin enclosure can become the binding constraint. Enclosure designers should confirm the finished dimensions against the approved production-intent drawing and account for bend-radius clearance in any wire channel.

At 0.37Wh, THOR-302020 suits devices whose average current draw keeps runtime within the target duty cycle. The NTC thermistor in the current configuration enables charging-temperature validation by the host’s charge controller. Use the runtime calculation guide↗ to validate your load profile against 100mAh before committing the mechanical layout. Wire gauge, length and termination can be adjusted for production orders. Contact THOR engineering to discuss your exact mechanical, electrical and regulatory requirements.

THOR-302020 Engineering & Fit Questions

What are the bare-cell and finished dimensions of THOR-302020?

The nominal bare-cell size is 3 × 20 × 20mm. With PCM and NTC, a finished length of approximately 22mm can be specified. The exact finished envelope depends on component placement, insulation, lead exit and termination, so enclosure design should be confirmed against the approved production-intent drawing.

What do the PCM and NTC add to THOR-302020?

The PCM (protection circuit module) provides overcharge, over-discharge and short-circuit protection. The NTC thermistor enables the host’s charge controller to monitor cell temperature during charging. Together they are connected via a 3-wire interface and add approximately 2mm to the cell’s length, bringing the finished assembly to roughly 22mm.

Can the THOR-302020 lead length be customized?

Yes. Approximately 30mm lead wires can suit compact wearable enclosures where routing space is limited. Wire gauge, lead length and termination style can be adjusted to match the electrical load, PCB layout and enclosure geometry, and should be confirmed before sample approval.

How does THOR-302020 compare to THOR-402020?

THOR-402020↗ (4 × 20 × 20mm, 100mAh) keeps the same nominal 100mAh capacity and 20 × 20mm footprint while increasing thickness from 3mm to 4mm. Choose THOR-302020 when the 3mm profile is essential and stack height is the binding constraint; choose THOR-402020 when the enclosure can accept the extra millimetre of thickness.

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-302020
Battery Type	Lithium Polymer (LiPo) pouch cell
Capacity	100 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

THOR-302020 3.7V 100mAh LiPo Battery – 3×20×20mm

The THOR-302020 is a 100mAh 3.7V lithium polymer battery in an ultra-thin 3×20×20mm bare-cell format, delivering 0.37Wh of energy at approximately 2.0g. Its 3mm profile makes it one of the thinnest cells in the 20×20mm footprint family, suited for wearable medical monitors and body-worn electronics where stack height is the binding constraint. A current custom configuration uses PCM + NTC with a 3-wire interface, approximately 30mm leads and a finished length of approximately 22mm.

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-302020

Mechanical Characteristics

Model	THOR-302020
Cell Type	Lithium Polymer (LiPo) pouch cell
Configuration	1S1P (customizable)
Dimensions (T×W×L)	3 × 20 × 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. 3 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	100 mAh
Energy	0.37 Wh
Charge Voltage	4.20 ± 0.03 V
Standard Charge	20 mA (0.2C), CC/CV to 4.20 V
Charge Cut-off Current	0.02C
Max. Charge Current	100 mA (up to 1C), model-specific
Discharge Cut-off Voltage	3.0 V
Standard Discharge	20 mA (0.2C)
Max. Continuous Discharge	100 mA (1C), model-specific
Internal Resistance	≤ 130 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-302020

Wearable Medical Monitoring DevicesContinuous vital-sign monitors worn on the wrist or chest, where 100mAh in a 3mm-thin 20 × 20mm square cell supports multi-day heart-rate, SpO2 and temperature logging.

Fall-Detection WearablesBody-worn fall-detection and alert devices for elderly or at-risk users, using accelerometer-based sensing and cellular or BLE alerting powered by an ultra-thin rechargeable cell.

Fitness TrackersUltra-thin wrist-band fitness trackers that prioritize minimal stack height, where a 3mm-profile 100mAh cell fits beneath a slim display module and maintains multi-day battery life.

Smart ID BadgesThin-form-factor electronic badges with NFC or BLE authentication and e-ink display, using a 3 × 20 × 20mm cell that fits within credit-card-adjacent badge enclosures.