401430 Li-Polymer Battery Guide: 3.7V 120mAh Specs for Compact Hardware & IoT Prototyping
The GEB 401430 lithium polymer battery is an elongated prismatic pouch cell measuring 4.0 mm in thickness, 14.0 mm in width, and 30.0 mm in length. Delivering a nominal 3.7V and 120 mAh capacity (0.444 Wh) at a bare mass of 2.6 grams, its slender rectangular form factor makes it the premier choice for narrow enclosures, such as digital active stylus pens, wearable medical patches, miniature IoT telemetry nodes, and compact hardware prototypes. Crucially, when designing charging circuits with chips like the TP4056 or MCP73831, the programming resistor must be calibrated to restrict charge current to 60mA–120mA (≤ 1.0C) to avoid dangerous over-current thermal breakdown.
1. The Slender Form Factor Advantage in Hardware Engineering
Many embedded devices — such as handheld test probes, smart digital writing pens, and narrow wristband modules — have strict lateral width constraints (≤16mm) but ample longitudinal length (≥32mm). Standard square or circular coin batteries cannot physically fit into such narrow cavities.
The 401430 pouch architecture provides 14.0mm width and 30.0mm length. This enables system designers to position the battery alongside a narrow PCB in an in-line configuration, creating ultra-slim, pen-shaped form factors without sacrificing energy capacity or structural balance.
2. Technical Datasheet: GEB 401430 LiPo Cell
Comprehensive electrical, mechanical, and operational parameters for schematic entry and PCB layout:
| Parameter | Engineering Value | Operational Threshold / Test Standard |
|---|---|---|
| Model Number | GEB-401430 | 4.0 mm (T) × 14.0 mm (W) × 30.0 mm (L) |
| Nominal Voltage | 3.70 V | Operating plateau: 3.65V – 3.75V |
| Rated Capacity | 120 mAh (±5%) | 0.2C (24mA) discharge to 3.0V cutoff @ 25°C |
| Stored Energy | 0.444 Wh | Volumetric energy density ~ 264 Wh/L |
| AC Internal Resistance (IR) | ≤ 65 mΩ | Tested @ 1 kHz AC four-wire Kelvin method |
| Standard Charge Current | 0.2C (24 mA) | CC/CV to 4.20V with 2.4mA cutoff (5.5 hrs) |
| Rapid Charge Current Ceiling | 1.0C (120 mA) | Absolute maximum charging rate allowable |
| Max Continuous Discharge | 1.0C (120 mA) | Continuous load rating to maintain ≥80% capacity retention |
| Pulse Discharge (1s) | 2.0C (240 mA) | RF data transmission burst (BLE / Zigbee / LoRa) |
| Bare Cell Weight | Approx. 2.6 g | Gravimetric energy density ~ 170 Wh/kg |
3. Critical Charger Circuit Design: Resistor Tuning for 120mAh LiPo
A widespread and hazardous error in hardware prototyping is connecting off-the-shelf breakout charging modules (such as standard TP4056 USB-C boards) directly to small lithium polymer batteries without replacing the programming resistor (RPROG). Standard breakout boards are factory-configured with RPROG = 1.2 kOmega, delivering a default charging current of 1,000 mA (1.0A).
Charging a 120mAh cell at 1,000mA subjects the chemistry to an extreme 8.33C charge rate, triggering rapid electrolyte boiling, intense heat buildup, gas generation, and catastrophic pouch rupture. Hardware engineers must replace RPROG according to the following design matrix:
| Programming Resistor (RPROG) | Charge Current (IBAT) | Effective C-Rate (120mAh) | Engineering Recommendation |
|---|---|---|---|
| 1.2 kΩ (Default Breakout) | 1,000 mA (1.0 A) | 8.33 C | DANGEROUS: Severe risk of fire and explosion. NEVER USE! |
| 10.0 kΩ | 130 mA | ~ 1.08 C | Permissible maximum rapid charge (Ambient 20°C–30°C). |
| 12.0 kΩ | 100 mA | ~ 0.83 C | Recommended fast charge: 80% charge in ~70 mins. |
| 20.0 kΩ | 60 mA | 0.50 C | Optimal balanced charge: Maximizes cycle life (>700 cycles). |
| 50.0 kΩ | 24 mA | 0.20 C | Standard slow charge profile for maximum thermal stability. |
Related Technical Guides & Solutions: Lithium Polymer Battery Selection Guide | OEM/ODM Custom Battery Design & Prototyping | GEB 401430 Product Datasheet
Industrial 401430 Battery Production – GEB
General Electronics Battery (GEB) manufactures certified 401430 lithium polymer cells for international hardware engineering teams, industrial IoT innovators, and consumer hardware developers. We provide custom wire harnesses, connector terminations (JST-ACH, Molex, Hirose), and integrated safety PCMs.
- Precision In-Line PCM: Ultra-narrow protection board fitting within the 14mm cell width envelope.
- Automated QC Verification: 100% capacity grading, automated OCV/IR sorting, and vacuum leakage verification.
- Full Regulatory Documentation: UN 38.3 test summaries, IEC 62133-2, CE, and RoHS compliance certificates provided for every batch.
Frequently Asked Questions: 401430 LiPo Batteries
How is the protection board mounted to the 401430 cell?
The micro-PCM is aligned across the top 14mm edge of the pouch cell. The nickel tabs are folded over the board with insulating Kapton (polyimide) tape underneath, spot-welded to the PCB pads, and encapsulated with high-temperature yellow silicone tape to provide mechanical strain relief and short-circuit isolation.
What is the minimum operating cut-off voltage for the 401430 cell?
The hardware PCM triggers hard cutoff at 3.00V (±0.05V). However, host microcontroller firmware should be configured to detect low battery at 3.30V and trigger an orderly software shutdown by 3.20V to prevent deep-discharge cell strain and maximize cycle longevity.
Can the 401430 cell be wired in parallel (1S2P) to achieve 240mAh?
Yes. If your enclosure has sufficient depth (8.0mm thickness) but the same 14mm × 30mm footprint, GEB can manufacture a factory-matched 1S2P pack delivering 3.7V 240mAh. The two cells are matched at the factory for identical voltage and internal resistance before parallel spot-welding to ensure balanced current sharing.
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