402020 Li-Polymer Battery: 3.7V 100mAh High-Performance Cell for Micro Electronics
The GEB 402020 lithium polymer battery is a high-performance square-profile pouch cell with physical dimensions of 4.0 mm thickness, 20.0 mm width, and 20.0 mm length. Delivering a nominal 3.7V and 100 mAh rated capacity (0.370 Wh) at approximately 2.1 grams, the 1:1 aspect ratio square geometry maximizes internal volumetric efficiency in compact square PCB housings. Featuring an ultra-low AC internal impedance (≤ 70 mΩ), the 402020 supports high continuous discharge rates up to 1.5C (150mA) and peak 3C RF transmission bursts, making it an ideal power source for miniature wireless audio devices, smart hearing aids, Bluetooth asset beacons, and precision industrial sensors.
1. The Engineering Advantage of the 1:1 Square Form Factor
Most miniature lithium polymer pouch cells exhibit elongated rectangular aspect ratios (such as 1:2 or 1:3). In square electronic enclosures (such as IoT environmental monitors, wireless conference microphones, and compact tracker tags), rectangular cells waste significant lateral volume, forcing system architects to accept smaller battery capacities.
The 402020 form factor utilizes a 20mm by 20mm square profile. This geometry allows the internal electrode layers to utilize 96% of the available enclosure floor area. Furthermore, the shortened internal conduction path across equal-length cathode and anode sheets results in lower DC internal resistance (RDC) and superior thermal dissipation during continuous load demands.
2. Technical Specifications: GEB 402020 High-Performance Cell
Electrical ratings, operating windows, and testing standards for the 402020 cell:
| Parameter | Engineering Specification | Operational Threshold / Test Condition |
|---|---|---|
| Cell Designation | GEB-402020 | 4.0 mm (T) × 20.0 mm (W) × 20.0 mm (L) |
| Nominal Voltage | 3.70 V | Operating plateau: 3.65V – 3.75V |
| Rated Capacity | 100 mAh (±5%) | 0.2C (20mA) discharge to 3.0V @ 25°C |
| Volumetric Energy Density | ~ 231 Wh/L | Calculated over nominal cell envelope volume |
| AC Internal Resistance (IR) | ≤ 70 mΩ | Tested @ 1 kHz AC four-wire Kelvin method |
| Standard Charge Current | 0.2C (20 mA) | CC/CV to 4.20V with 2.0mA cutoff |
| Max Rapid Charge Rate | 1.0C (100 mA) | Achieves 80% charge in approximately 55 minutes |
| Max Continuous Discharge | 1.5C (150 mA) | Continuous load ceiling without external heat sinks |
| Max Peak Pulse Discharge | 3.0C (300 mA for ≤ 2 sec) | Haptic feedback motor drive, RF power amplifier bursts |
| Cycle Retention (≥80%) | ≥ 500 cycles | 0.5C charge / 0.5C discharge cycling @ 25°C |
3. Thermal Dissipation & Pulse Load Tolerance Dynamics
The compact square foil architecture of the 402020 provides distinct thermal advantages over long, narrow cells. Under heavy discharge loads, heat generation is governed by internal resistive losses (Ploss = I² × Rinternal):
| Discharge C-Rate | Load Current | Initial Voltage Sag (ΔV) | Surface Temperature Rise (ΔT) | Thermal Management Recommendation |
|---|---|---|---|---|
| 0.5C Standard | 50 mA | < 0.05 V | < 2.5 °C | Passive enclosure dissipation; no thermal pads required. |
| 1.0C Nominal | 100 mA | ~ 0.09 V | ~ 5.0 °C | Normal operating range; ensure ambient temp ≤ 45°C. |
| 2.0C Pulse Burst | 200 mA | ~ 0.18 V | ~ 9.5 °C (Sustained) | Acceptable for intermittent pulses (≤10 sec bursts). |
| 3.0C Peak Transient | 300 mA | ~ 0.28 V | Transient spike | Permissible for sub-second radio bursts only. |
Related Technical Guides & Solutions: Lithium Polymer Battery Selection Guide | OEM/ODM Custom Battery Design & Prototyping | GEB 402020 Product Datasheet
Custom 402020 LiPo Battery Engineering – GEB
General Electronics Battery (GEB) manufactures high-reliability 402020 lithium polymer cells for international smart device brands. We offer customized lead lengths, JST or Molex connectors, gold-plated spring pins, and customized PCM boards configured to your application’s current limits.
- Automated Voltage & IR Matching: Strict lot sorting ensuring ΔV ≤ 3mV and ΔIR ≤ 3mΩ across mass production runs.
- Ultra-Low Quiescent PCM: Micro-protection boards with static current consumption under 2.5 μA.
- Full Regulatory Coverage: Certified UN 38.3 test summaries, IEC 62133-2, UL 1642, CE, and RoHS documentation.
Frequently Asked Questions: 402020 LiPo Battery Cells
What is the difference between the 402020 and 302025 cells?
Both models deliver 100mAh of nominal capacity. However, the 402020 is 4.0mm thick with a square 20mm × 20mm footprint, whereas the 302025 is 3.0mm thick with a rectangular 20mm × 25mm footprint. The 402020 is preferred when enclosure length is constrained to ≤22mm, while the 302025 is selected when ultra-thin profiles (≤3.2mm) are required.
Can the 402020 cell be mounted directly on top of a microcontroller IC?
Mounting the cell directly on a heat-generating microcontroller or power management IC (PMIC) is strongly discouraged. Sustained heat transfer (>45°C) from the processor into the battery accelerates electrolyte breakdown and pouch swelling. Place a thermal insulating barrier (such as a 0.2mm aerogel or polyimide sheet) between the processor and the battery pouch.
What packaging options are available for the 402020 cell?
GEB delivers 402020 assemblies as bare pouch cells with laser-welded nickel tabs, insulated soft packs with protective PCM and flying leads, or potted modules with hard plastic frames for enhanced mechanical impact resistance.
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