423040 3.7V 400mAh Lipo Battery for Smart Wearable Watch, Asset Tracker, Medical Telemetry Sensor
| Parameter | Specification |
|---|---|
| Model | VTC-LP423040 |
| Battery Type | Lithium-ion Polymer Rechargeable Battery |
| Nominal Voltage | 3.7 V |
| Nominal Capacity | 400 mAh |
| Standard Charging Current | 80 mA (0.2C) |
| Rapid Charging Current | 400 mA (1C) |
| Standard Discharging Current | 80 mA (0.2C) |
| Cell Dimensions (Max) | Thickness: 4.2 mm | Width: 30.0 mm | Height: 40.0 mm |
| Pack Weight | ≈ 9 g |
High Temperature 423040 3.7V 400mAh lithium ion polymer battery for RC Models, Drones, and Smart Devices
The VTCBATT VTC-LP423040 is a high-performance 3.7V 400mAh lithium polymer battery pack engineered for modern high-reliability wearable and industrial applications. Offering a nominal energy capacity of 1.48Wh, this compact rechargeable cell operates at a nominal voltage of 3.7V and is designed with an ultra-thin 4.2mm form factor, a max width of 30.0mm, and a max cell height of 40.0mm. It features a standard charging profile of 0.2C (80mA) constant current up to 4.2V, followed by constant voltage charging, and a maximum continuous discharge current of 1.0C (400mA) down to a cut-off voltage of 3.0V. To ensure maximum operational safety, each cell is integrated with a high-precision PCBA protection circuit board (PCM) featuring a genuine Seiko S8261 protection IC and dual MOSFETs, which safeguard the battery against overcharge, over-discharge, over-current, and external short circuits. Operating across a wide temperature range—charging from 0°C to 60°C and discharging from -20°C to 75°C—the VTC-LP423040 is built to withstand rigorous environmental conditions.
As a leading professional lithium battery manufacturer, VTCBATT offers comprehensive direct factory wholesale supply, stable batch production support, and premium OEM/ODM customization services. We support custom wire lead lengths, specialized NTC thermistor configurations, and terminal connector matching to deliver fully-integrated, application-ready power assemblies for global equipment manufacturers.
Compact Wearable Integration
Custom PCM Manufacturing Configuration
Integrated Seiko PCM Protection
IoT Device Standby Power Optimized for low self-discharge
Full Certification & Extended Warranty
VTCBATT High Temperature 423040 3.7V 400mAh LiPo batteries meet global certifications including CB, CE, UL, and UN38.3, and offer a 14-month warranty—two months longer than standard—to maximize customer confidence and profit.
VTCBATT High Temperature 423040 3.7V 400mAh lipo battery passed all the major global certifications, such as CB, CE, EN61000, IEC62133, MSDS, UN38.3, ROHS, UL, BIS, KC Certification, which makes your product more competitive.
Compared to a normal 12-month warranty, VTCBATT lipo batteries have 14-month warranty and two extra months for shipping and customs clearance ,which ensure the customer’s profit.
VTCBATT Production and Service
Based on long-term and beneficial partnerships,VTCBATT takes strict quality control and standardized manufacturing across each production step.All the batteries are conducted strict quality test to ensure stable performance and long lifespan. Under complete support from pre-sales to after-sales,VTCBATT established nice cooperation with worldwide customers from 80+ countries.
From the raw materials mixing to the cell test, VTCBATT adopts an automatic manufacturing process to maximize production efficiency and enhance the batteries quality, safety, and reliability. The entire manufacturing process is monitored and 100% tested before flowing to the next procedure to ensure zero defects before delivery.
Over the past 20 years, VTCBATT has built strong partnerships with customers in more than 50 countries worldwide. With reliable quality, responsive service, and tailored battery solutions, we have earned the trust of our clients—many of whom have maintained long-term cooperation and lasting friendships with us for over a decade. Together, we continue to grow and move forward toward a brighter future.
Application for High Temperature 423040 3.7V 400mAh polymer lithium ion battery
Designed with a space-saving rectangular footprint and lightweight chemistry (~9g), the VTC-LP423040 3.7V 400mAh rechargeable battery pack is the ideal power solution for a diverse range of compact smart hardware, portable telemetry, and IoT devices. The battery’s slim profile and high energy density make it exceptionally well-suited for integration into wearable health monitors, smart watches, fitness bands, and medical telemetry patches, where reliable, low-weight standby power is critical. Additionally, its robust cycle life (>=600 cycles) and low self-discharge rate support long-term deployments in GPS asset trackers, wireless IoT sensor nodes, cold-chain temperature data loggers, and smart home locks. To assist product designers and system integrators, VTCBATT provides flexible, application-specific customization options. This includes tailored lead wire specifications (such as UL3302 28AWG), integration of high-precision NTC thermistors (like 10K 1% B3435) for thermal management, and precision matching with brand-name connectors (including Molex, JST, or Hirose). We also provide custom PCBA layouts, private labeling, rapid prototyping, and exhaustive safety/reliability compliance testing prior to mass production. Whether you are a distributor, an OEM/ODM brand owner, or a specialized device manufacturer, VTCBATT offers premium direct factory-to-business wholesale logistics and high-volume manufacturing capabilities to accelerate your product’s time-to-market.
3.7V 450mAh LP423040 Lithium-ion Polymer Rechargeable Battery
High-performance rechargeable LiPo cell engineered with high-density chemistry. Featuring integrated Seiko protection IC and dual MOSFET safety circuits, customized for wearable medical devices, smart IoT tags, GPS trackers, and premium microelectronics.
1. Scope & Product Specification
This technical datasheet describes the parameters and testing standards for the Li-ion Polymer Rechargeable Battery, model VTC-LP423040, manufactured and supplied by VTC Power Co., Ltd.
Designed with standard B2B commercial reliability, this cell features high safety levels, excellent discharge rate stability, and deep cycle longevity. VTC Power offers complete customization including PCM circuit tuning, wire length customization, NTC thermal resistor integration, and standard connector terminations.
2. Drawing of Cell & Battery Pack Dimensions
Mechanical dimensions define the cell parameters and battery pack constraints. Standard tolerances apply.
| Item | Description | Specification / Dimension |
|---|---|---|
| A | Cell Tab Length | 4 ~ 8 mm |
| B | Cell Tab Pitch | 16 ± 1.5 mm |
| C | Cell Tab Width | 3 ± 0.2 mm |
| D | Cell Top Sealant Length | 4 ± 1 mm |
| T (Cell) | Cell Thickness (Max) | Initial: 4.2 mm | After 600 cycles: 4.6 mm |
| W (Cell) | Cell Width (Max) | 30.0 mm |
| H (Cell) | Cell Height (Max) | 40.0 mm |
| T (Pack) | Battery Pack Thickness (Max) | 4.4 mm |
| W (Pack) | Battery Pack Width (Max) | 30.5 mm |
| H (Pack) | Battery Pack Height (Max) | 42.5 mm |
| L | Wire Length | 60 ± 3 mm (UL3302 28AWG) |
3. Basic Performance Specifications
All parameters are measured at a standard temperature of 15~35°C, relative humidity 45~85%RH, and atmospheric pressure of 86~106KPa.
| NO. | Technical Parameter | Specification Value | Test Conditions / Notes |
|---|---|---|---|
| 1 | Rated Capacity | 460 mAh | 0.2C discharge |
| 2 | Nominal Capacity | 450 mAh | 0.2C discharge |
| 3 | Minimum Capacity | 390 mAh | 0.2C discharge |
| 4 | Weight | ≈ 9 g | Approximate battery pack weight |
| 5 | Initial Impedance | ≤ 200 mΩ | AC 1KHz measured |
| 6 | Normal Voltage | 3.7 V | Standard operating voltage |
| 7 | Initial Voltage | ≥ 3.8 V | Voltage within 15 days of factory shipment |
| 8 | Limited Charge Voltage | 4.2 V | Maximum charging termination limit |
| 9 | Standard Charging Method | 0.2C CC current charge to 4.2V, then CV charge till current declines to 0.01C | |
| 10 | Cut-off Voltage | 3.0 V | Load voltage when discharge is terminated |
| 11 | Standard Charging Current | 90 mA (0.2C) | CC charge to limited voltage, then CV charge |
| 12 | Standard Charging Time | 6 ~ 7 hours | CC-CV charge profile |
| 13 | Rapid Charging Current | 450 mA (1C) | 1.0C rate rapid charging current |
| 14 | Rapid Charging Time | 1.5 hours | Fast charge profile |
| 15 | Standard Discharging Current | 90 mA (0.2C) | CC discharge to cut-off voltage |
| 16 | Max. Discharging Current | 450 mA (1C) | 1.0C rate continuous discharge |
| 17 | Operating Temperature | Charge: 0 ~ 60 °C Discharge: -20 ~ 75 °C | Operating environment constraints |
| 18 | Operating Humidity Range | ≤ 90% RH | Non-condensing environment |
4. Electrochemical & Environmental Characteristics
Strict criteria applied during environmental qualification testing:
| No. | Test Item | Performance Criterion | Standardized Test Method |
|---|---|---|---|
| 1 | 0.2C Discharge Capacity | Discharging capacity is not less than normal capacity (450 mAh) | After standard charging, rest 5 minutes, then discharge at 0.2C to cut-off voltage. |
| 2 | 1.0C Discharge Capacity | Discharging capacity is not less than 90% of normal capacity | After standard charging, rest 5 minutes, then discharge at 1.0C to cut-off voltage. |
| 3 | Cycle Life | ≥ 600 cycles | Charge: 0.2C CC-CV to limited voltage, current cut-off 0.02C. Discharge: 0.2C CC to cut-off voltage. Test terminates when capacity drops below 80% of rated capacity. |
| 4 | Self-discharge | Remaining capacity is ≥ 85% of initial capacity | After standard charging, store the cell for 28 days at 20 ± 5°C. Then discharge at 0.2C. |
| 5 | Constant Temp/Humidity | No explosion, no fire, no leakage. Capacity is ≥ 60% of initial capacity. | Standard charged cell stored for 48 hours at 40 ± 5°C and 90~95% RH. Then discharge at 1.0C. |
| 6 | Vibration Test | No explosion, no fire, no leakage. | Subject to 30 min vibration per axis (X, Y, Z). Freq: 10~30Hz, Amp: 0.38mm. Freq: 30~55Hz, Amp: 0.19mm. Rate: 1 oct/min. |
| 7 | Shock Test | No explosion, no fire, no leakage. | Acceleration: 100 m/s² (10G). Pulse duration: < 16 ms. Shock cycles: 2100 ± 10 times. |
5. Safety Characteristics
Note: Safety assessments are performed under strictly controlled test parameters using protective enclosures.
| No. | Safety Test | Pass Criterion | Test Conditions |
|---|---|---|---|
| 1 | Overcharge Test | No explosion, no fire | Discharge cell at 1.0C to cut-off voltage. Then charge at 1.0C continuously for 2.5 hours. |
| 2 | Short-circuit Test | No explosion, no fire | Standard charged cell is short-circuited externally with copper wire (resistance ≤ 80mΩ). Test runs until cell temperature falls 10°C below the peak temperature. |
| 3 | Thermal Test (Hot Box) | No explosion, no fire | Standard charged cell placed in hot box. Temp ramp: 5 ± 2°C/min. Termination temperature: 130 ± 2°C. Heat sustained for 30 minutes. |
6. PCBA Protection Circuit (PCM) Specifications
Equipped with premium Japanese Seiko high-precision voltage detection IC to secure full operation life cycle.
6.1 Electrical Characteristics
| No. | Protection Parameter | Min | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| 1 | Over-charge Protection Voltage | 4.260 | 4.280 | 4.300 | V |
| 2 | Over-charge Release Voltage | 4.130 | 4.180 | 4.230 | V |
| 3 | Over-charge Protection Delay Time | 0.7 | 1 | 1.3 | s |
| 4 | Over-discharge Protection Voltage | 2.950 | 3.000 | 3.050 | V |
| 5 | Over-discharge Release Voltage | 2.900 | 3.000 | 3.100 | V |
| 6 | Over-discharge Protection Delay Time | 179 | 256 | 333 | ms |
| 7 | Over-current Protection for Discharge | 2.0 | 3.5 | 5.0 | A |
| 8 | Internal Resistance | / | 45 | 60 | mΩ |
| 9 | Operation Static Current | 3 | 5 | 7 | μA |
| 10 | Current Consumption (Power Down) | / | / | 0.5 | μA |
| 11 | Short Circuit Protection | Available (Auto-recovery) | – | ||
| 12 | Short Circuit Protection Delay Time | 196 | 280 | 364 | μs |
6.2 PCBA Parts List & Bill of Materials (BOM)
| No. | Location | Part Name | Specification Description | Package | Qty | Brand/Note |
|---|---|---|---|---|---|---|
| 1 | U1 | Protection IC | S8261DAI-M6T1U (Seiko IC) | SOT23-6 | 1 | Seiko (Japan) |
| 2 | U2 | MOSFET | dp8205 Dual Channel MOSFET | TSSOP-8 | 1 | DP MOSFET Dept |
| 3 | R1 | Resistor | 330 Ω ± 5% | 0603 | 1 | Yageo |
| 4 | R2 | Resistor | 470 Ω ± 5% | 0603 | 1 | Yageo |
| 5 | R3 | NTC Resistor | 10K Ω ± 1%, B3435 ± 1% | 0603 | 1 | 10K NTC |
| 6 | C1 | Capacitor | 0.1 μF / 25V ± 5% | 0603 | 1 | Murata |
| 7 | PCB | Printed Circuit | LP423040 Standard Board | / | 1 | FR4 RoHS Compliant |
7. Battery Pack Component Details
Bill of materials used for pack housing and interface connectors.
| No. | Component | Qty | Material Details / Specifications |
|---|---|---|---|
| 1 | LiPo Cell | 1 | VTC-LP423040 | 450mAh Li-ion polymer cell |
| 2 | PCM Circuit | 1 | Fiber glass polymer compound circuit board (Pass RoHS) |
| 3 | Wire Leads | 3 | UL3302 28AWG Polythene and copper wires |
| 4 | Connector | 1 | Molex 51021-3P (PA66, UL94V-0, White) |
8. Storage and Battery Safety Cautions
Proper cell management guarantees prolonged lifecycle performance and safeguards against field hazards.
8.1 Storage Temperature Thresholds
| No. | Storage Duration | Allowable Temp. | Recommended Storage Humidity |
|---|---|---|---|
| 1 | Short Term (≤ 1 month) | -20 ~ 45 °C | 65 ± 20% RH (Non-condensing environment) |
| 2 | Medium/Long Term (≤ 3 months) | -10 ~ 45 °C | |
| 3 | Recommended Storage | 15 ~ 35 °C |
8.2 Safety Instructions & Hazard Mitigation
- ◆
Charging Profile: Never charge the battery beyond the maximum voltage of 4.2 V. Reverse charging is strictly prohibited. - ◆
Discharge Handling: Do not force discharge past 3.0 V. Avoid short-circuiting the positive (+) and negative (-) gold-plated wire leads. - ◆
Mechanical Cautions: Do not crush, puncture, incinerate, open, drop, or solder directly onto the cell casing wrapper. - ◆
Do not deploy the battery inside heavy static-charge or high electromagnetic fields to prevent damaging the PCM circuit. - ◆
If electrolyte leakage occurs and contacts eyes, do not rub. Immediately flush eyes with running water and seek emergency medical aid. - ◆
If the cell emits odors, thermal heat, discoloration, swelling, or deformation during charging or use, terminate charging and isolate the cell immediately.
B2B Custom Assembly & Direct Wholesale
VTC Power provides comprehensive OEM/ODM custom solutions for the VTC-LP423040. Contact our engineering team for custom wire harness design, connectors (JST, Molex, Hirose), NTC thermistors, and high-performance safety PCM integration.
