THOR 301525 3.7V 50mAh lithium polymer battery with PCM protection, red and black lead wires, and 2-pin connector

THOR 301525 3.7V 50mAh LiPo battery dimension drawing showing T×W×L = 3 × 15 × 27 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

THOR-301525 is a 3mm-thick, broad micro pouch cell for low-power products with a shallow 15 × 25mm battery area. THOR-301025 keeps the same 50mAh capacity and 3mm thickness in a narrower 10 × 25mm format. THOR-401020 provides 55mAh in a smaller 10 × 20mm footprint but requires 4mm nominal cell thickness.

The 3 × 15 × 25mm value is the nominal bare-cell envelope. The current PCM-equipped drawing is approximately 3 × 15 × 27mm. In a micro enclosure, PCM position, insulation, lead exit, connector height and wire bend radius can dominate the finished geometry, so verify the production-intent assembly before tooling.

At 3.7V nominal and 50mAh, THOR-301525 stores approximately 0.19Wh. Standby current, wake-up frequency, wireless transmit pulses, regulator losses, cutoff voltage, temperature and aging all materially affect runtime. Validate pulse-load behavior and voltage sag with the actual electronics.

THOR-301525 Engineering & Fit Questions

How does THOR-301525 compare with THOR-301025 and THOR-401020?

THOR-301525 and THOR-301025↗ are both 3mm-thick 50mAh cells, but THOR-301525 is 15mm wide instead of 10mm. THOR-401020↗ raises capacity to 55mAh and uses a smaller 10 × 20mm footprint, but requires 4mm thickness.

Why can the finished THOR-301525 pack be larger than 3 × 15 × 25mm?

Those are nominal bare-cell dimensions. The current PCM-equipped drawing is approximately 3 × 15 × 27mm, and connector height, insulation, lead exit and wire routing can add further space. These details are especially important in shallow micro enclosures.

What should be validated for a 50mAh wireless design?

Measure standby drain, wake-up frequency, transmit pulse magnitude and duration, regulator efficiency, cutoff voltage and temperature behavior. Small cells can experience voltage sag during short peaks, so approval should be based on the actual electronics and production-intent battery.

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-301525
Battery Type	Lithium Polymer (LiPo) pouch cell
Capacity	50 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 50mAh Lithium Polymer (LiPo) Battery with Connector | THOR-301525

THOR-301525 is a 3.7V 50mAh LiPo pouch cell with approximately 0.19Wh nominal energy and a very thin 3 × 15 × 25mm bare-cell envelope. Its broad micro-cell footprint suits shallow low-power cavities; compare THOR-301025 for a narrower 3mm cell or THOR-401020 when additional thickness and capacity are acceptable. Finished-pack and pulse-load requirements must be validated.

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-301525

Mechanical Characteristics

Model	THOR-301525
Cell Type	Lithium Polymer (LiPo) pouch cell
Configuration	1S1P (customizable)
Dimensions (T×W×L)	3 × 15 × 25 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	50 mAh
Energy	0.19 Wh
Charge Voltage	4.20 ± 0.03 V
Standard Charge	10 mA (0.2C), CC/CV to 4.20 V
Charge Cut-off Current	0.02C
Max. Charge Current	50 mA (up to 1C), model-specific
Discharge Cut-off Voltage	3.0 V
Standard Discharge	10 mA (0.2C)
Max. Continuous Discharge	50 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-301525

Low-Duty Wearable Sensor Patches — PrimaryThe 3mm nominal thickness and broad 15 × 25mm footprint can suit shallow wearable sensor patches when skin-side packaging, duty cycle, pulse load and finished-pack clearance are validated.

Miniature Wireless Asset TagsTHOR-301525 may suit asset tags with very low standby drain and brief radio activity after transmit pulses, wake frequency, antenna placement and enclosure fit are tested.

Slim Indicator & Beacon ElectronicsThe cell can support compact indicators or beacons with modest energy demand when LED or radio duty cycle, cutoff voltage and wire routing are controlled.