GEB 401120 Li-Polymer Battery Cell: 3.7V 60mAh for Ultra-Compact Portable Devices
The GEB 401120 lithium-ion polymer battery is an ultra-compact prismatic pouch cell with dimensional boundaries of 4.0 mm thickness, 11.0 mm width, and 20.0 mm length. Delivering 3.7V nominal potential and 60 mAh rated capacity (0.222 Wh) with a weight of only 1.5 grams, the 401120 cell provides an optimal balance of micro-footprint packaging and robust cycle stability (≥500 cycles). It serves as the primary energy platform for TWS audio hardware, wireless active stylus pens, micro voice recorders, and fingertip biometric pulse oximeters.
1. Dimensional Mechanics of the 401120 Pouch Form Factor
In standard battery dimensional designations, the six-digit code indicates physical size in millimeters: 40 denotes 4.0 mm thickness, 11 denotes 11.0 mm width, and 20 denotes 20.0 mm length. The narrow 11mm width and short 20mm length make this cell ideally suited for cylindrical cavities and narrow longitudinal enclosures where coin cells are either too wide or too heavy.
Despite its micro-scale footprint, the cell integrates internal multi-layer stacked electrode foils and a specialized gel polymer electrolyte matrix that maintains internal resistance below 90 mΩ, ensuring steady voltage discharge under RF transmit loads without premature low-voltage cutoffs.
2. Electrical and Mechanical Specification Matrix: GEB 401120
Comprehensive engineering parameters for circuit schematic modeling and physical mechanical layout:
| Technical Parameter | Nominal Value | Engineering Tolerance & Remarks |
|---|---|---|
| Thickness (T) | 4.0 mm | ± 0.2 mm (Fresh cell); allow +0.3mm swelling over cycle life |
| Width (W) | 11.0 mm | ± 0.5 mm |
| Length (L) | 20.0 mm | ± 0.5 mm (Excluding tab length; total pack with PCM ~22.5mm) |
| Nominal Voltage | 3.70 V | Operating plateau: 3.60V – 3.80V |
| Rated Capacity | 60 mAh | Standard discharge 0.2C (12mA) to 3.0V cutoff |
| AC Internal Resistance (IR) | ≤ 90 mΩ | Four-wire Kelvin testing @ 1 kHz AC |
| Standard Charge Current | 0.2C (12 mA) | CC/CV to 4.20V with 1.2mA cutoff (approx. 5.5 hours) |
| Rapid Charge Current | 1.0C (60 mA) | Maximum allowable charge rate at ambient 20°C–35°C |
| Max Continuous Discharge | 1.0C (60 mA) | Continuous operating ceiling (Pulse capable up to 2C / 120mA) |
| Weight | Approx. 1.50 g | High specific energy (~148 Wh/kg) |
3. Runtime Modeling & Current Budgeting for 60mAh Load Profiles
Designing portable IoT devices around the 401120 cell requires a strict current budget. Below is an engineering runtime estimation for a Bluetooth Low Energy (BLE 5.2) peripheral device:
| Operating State | Current Consumption | Duty Cycle (%) | Average Current Contribution |
|---|---|---|---|
| Deep Sleep (RTC Active) | 4.5 μA | 98.50 % | ~ 4.43 μA |
| Sensor Sampling (I2C) | 850 μA | 1.20 % | ~ 10.20 μA |
| BLE RF Advertising Burst | 14.0 mA | 0.30 % | ~ 42.00 μA |
| Total Combined Average | — | 100.0 % | ~ 56.63 μA (Over 1,000 Hours / 41 Days Runtime) |
Related Technical Guides & Solutions: Lithium Polymer Battery Selection Guide | OEM/ODM Custom Battery Design & Prototyping | GEB 402020 100mAh Battery Comparison
Custom 401120 LiPo Battery Pack Assembly – GEB
General Electronics Battery (GEB) supplies certified 401120 polymer cells and finished miniature battery packs to tier-1 consumer electronics and medical equipment makers worldwide. We provide custom wire harnesses (UL10064 32AWG), custom JST/Molex miniature connectors, and integrated micro-protection circuits.
- Low Standby Leakage PCM: Integrated protection boards with standby current under 2.5 μA to protect inventory.
- High Automated Consistency: Automated sorting and grading lines ensuring lot variance ΔV ≤ 3mV and ΔIR ≤ 3mΩ.
- Full Transport & Safety Compliance: UN 38.3, IEC 62133-2, CE, and RoHS certified test reports available upon request.
Frequently Asked Questions: 401120 LiPo Cells
How much extra length does a protection circuit module (PCM) add to a 401120 cell?
A standard micro-PCM board adds approximately 2.0 mm to 2.5 mm to the overall cell length, bringing the total assembly length to 22.0mm – 22.5mm. When specifying enclosure cavities, mechanical engineers should allocate at least 23.5mm in length and 4.4mm in thickness to accommodate solder joints, insulating Kapton tape, and normal electrochemical swelling.
What wire gauges are suitable for 60mAh micro-cells?
Due to the miniature terminal tab size and space restrictions, GEB typically equips 401120 packs with ultra-fine flexible silicone or Teflon-insulated wires such as UL10064 30AWG or 32AWG. These provide excellent mechanical flex life while fitting inside compact product housings.
Can the 401120 battery be charged via wireless inductive coils?
Yes. Many modern smart stylus pens and wearable rings charge the 401120 cell via Qi-compliant or proprietary micro wireless charging coils. To protect the battery, a ferrite shielding sheet must be placed between the wireless RX coil and the LiPo pouch to prevent electromagnetic eddy currents from heating the cell.
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