Introduction
400mAh Polymer Lithium Ion Battery features a high-density, ultra-slim design. It solves tight internal space issues for wearables while ensuring safety and stable power through precision factory-integrated protection circuits.
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Charge voltage |
4.2V |
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Nominal voltage |
3.7V |
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Nominal capacity |
400mAh 0.5C Discharge |
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Charge current |
Standard Charging: 0.5C |
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Rapid charge: 2.0C |
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Discharge current |
Standard discharging: 0.5C |
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Rapid discharging: 1.0C |
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Standard Charging method |
0.5C CC(constant current)charge to4.2V,then CV(constant voltage 4.2V)charge till charge current decline to ≤0.02C |
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Charging Time |
Standard Charging: 3.5 hours |
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Standard discharge method |
1C CC(constant current)discharge to Min Discharge cut-off voltage(3.3) |
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Operating temperature |
Charging: 0℃~45℃ |
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Discharging: -20℃~60℃ |
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Storage temperature |
-20℃~ +50℃ |
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Storage humidity |
45~65%RH |
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Dimension |
Length: 40±2mm(not including tabs) Width: 20±0.2mm Thickness: 52±0.2mm |
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Cycle time |
≥300times ≥300 |
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Vibration Test |
After standard charge, fixed the cell to ibration table and subjected to vibration cycling that the frequency is to be varied at the rate of 1Hz per minute between 10Hz and 55Hz, the excursion of the vibration is 1.6mm.The cell shall be vibrated |
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for 30 minutes per axis of XYZ axes. |
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Free fall |
The battery to be fully charged with standard charging condition ,then fall from height of 1.0m and hit onto concrete ground 2 times |
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Heating Test |
The temperature of the oven is to be raised at a rate of 5±2℃min. to a temperature of 130±2℃, and remains for 30 minutes at this temperature. |
Key Features
5mm Slim Structure
Total thickness controlled at 5.2mm. Fits compact housings without forcing internal layout changes.
Extended Cycle Durability
Maintains ≥80% capacity after 500 full cycles. Engineered for high-frequency use devices, ensuring a product lifespan of 1.5–2 years.
Optimized Low Self-Discharge
Advanced cell chemistry minimizes voltage drop during storage. Ensures devices are "Ready-to-Use" even after 3–6 months of warehousing.
Industrial-Grade Edge Sealing
Reinforced folded edge structure improves mechanical strength. Effectively prevents electrolyte leakage and swelling under vibration or impact.
Customization Options
Dimensional Tuning: Adjustable length, width, and thickness.
Connector Integration: JST, Molex, Hirose, or custom lead wire lengths.
PCM Optimization: Custom protection boards for high-discharge or ultra-low power consumption.
Shape Variety: Round, arc, or trapezoidal cells for irregular housings.
Applications
Wearable Tech: Smartwatches, fitness trackers, and smart rings.
Wireless Audio: TWS earbuds and Bluetooth communication headsets.
Medical Devices: Pulse oximeters, digital thermometers, and hearing aids.
IoT & Security: GPS trackers, smart sensors, and electronic locks.
Why Choose Our LiPo Batteries
Grade-A Cell Guarantee
We exclusively use Grade-A cells to ensure batch-to-batch consistency and zero-swelling performance.
Full Compliance Support
All shipments come with UN38.3, MSDS, and IEC62133 documentation for safe global logistics and customs clearance.
Rigorous Testing
Every battery undergoes vibration, free fall, and thermal abuse testing (130°C) to ensure safety in extreme conditions.
FAQ
Q: What is your MOQ?
A: MOQ depends on specification. Standard models are available with flexible minimum order quantities.
Q: Can I get samples for testing?
A: Yes, samples are available for evaluation. Typical lead time is 3–10days.
Q: Do you support OEM/ODM customization?
A: Yes, we provide full OEM/ODM services including size, capacity, connectors, and labeling.
Q: How do you ensure product quality consistency?
A: We implement strict quality control processes including capacity grading, internal resistance testing, and batch consistency control to ensure stable performance.
Q: How do you handle the swelling issue common in LiPo batteries?
A: We use high-purity aluminum-plastic film and optimized electrolyte formulas. Each cell undergoes a high-temperature aging test (45°C-60°C) before shipment to ensure stability under stress.
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