Need a compact power source for your wireless earbuds, small GPS trackers, or medical patches? This 702030 400mAh Li-ion prismatic battery for medical device and lamps and lanterns, the battery rechargeable Li-Po delivers stable 3.7 ~ 4.2V output. 400mAh supports daily-use Bluetooth earbuds and smart rings. Core R&D technology features low self-discharge and fast charging. We're a Chinese supplier with quick custom order turnaround. Request a quote — we ship worldwide from our Hunan factory.
Nominal Voltage: 3.7V
Delivery Voltage: 3.7V ~ 4.2V
Nominal Capacity: 400mAh
Measurement: 7.2 × 20.3 × 32.5mm
| Item | Specification |
| Model | 702030 |
| Material | Li-ion Polymer Battery |
| Normal Capacity (0.2C) | 400mAh |
| Minimum Capacity (0.2C) | 400mAh |
| Energy | 1.48Wh |
| Normal Voltage | 3.7V |
| Delivery Voltage | 3.7V ~ 4.2V |
| Standard Charge Method | Charge at maximum current. When the battery or pack terminal voltage reaches the charging limit voltage, charge at constant voltage until the charging current is less than or equal to 0.02 C, then stop charging. |
| Discharge Program | The battery or the battery pack carries on the constant current discharge with the maximum discharge current to the discharge termination voltage. |
| Max Charging Current | 1C CC/CV → 0.02C cutoff |
| Max Discharging Current | 1C CC/CV → 3.0V cutoff |
| Over-Discharging Current | 3.0V |
| Operation Temperature Range |
Charging: 0°C ~ 50°C Discharging: -20°C ~ 60°C |
| Allowable Maximum Surface Temperature |
Charging: Tmax ≤ 50°C Discharging: Tmax ≤ 60°C |
| Storage T/H Range (time) |
-20°C ~ 60°C (Less than 1 month) -20°C ~ 45°C (Less than 3 months) -20°C ~ 25°C (Less than 1 year) |
| Cycle Life |
≥ 300 times (Thickness expansion rate ≤ 10%) ≥ 500 times (Thickness expansion rate ≤ 12%) |
400mAh Li-ion prismatic battery for medical device and lamps and lanterns
1. Low leakage current
2. Ultra-thin profile
3. Thermal runaway resistant
4. High depth-of-discharge tolerance
5. Extended calendar life
Lithium ion polymer battery is widely used in digital products:
400mAh Li-ion prismatic battery for medical device and lamps and lanterns, Smart watches, Fitness trackers, Smart glasses, Hearing aids, Neckband earphones, Gaming headsets, Smart watches, Fitness trackers, Smart glasses, Hearing aids, Neckband earphones, Gaming headsets etc.
1. Standard export carton packaging or Custom-made Package
2. Mode of Transport:
(1) By express UPS/DHL/FEDEX/TNT (It takes 3-15 days to arrive)
(2) By air cargo (It takes about one week to arrive)
(3) By sea shipment (It takes about one month to arrive)
3. Delivery 4 – 25 working days after payment and packing confirmation.
We leave nothing to chance when it comes to quality. Our manufacturing facilities are governed by a full-process MES (Manufacturing Execution System) intelligent control network, backed by online K-value inspection stations and precision automated weighing. Every single polymer pouch cell undergoes an exhaustive suite of testing — including vacuum leak detection, OCV/K-value measurement, and formation grading. This absolute digital traceability ensures that every batch delivered is identical to the approved sample.
Innovation drives our performance. Yideng is anchored by a powerhouse R&D laboratory staffed by over 150 engineering professionals, including 7 elite Ph.D. and postdoctoral researchers. Holding 68 proprietary patents in advanced battery architecture, our technical team continuously pushes the boundaries of energy density, fast-charging protocols, and thermal safety. Partnering with us means gaining direct access to cutting-edge lithium technology that keeps your product ahead of market trends.
Navigating international customs and safety standards is seamless with Yideng. Since our inception, we have maintained certified compliance with ISO9001:2015 and ISO14001:2015 standards. Furthermore, our products are engineered to pass the world's most stringent regulatory hurdles, holding authentic certifications including UL1642, UL2054, CE, CB, KC, PSE, BIS, IEC62133, RoHS, and UN38.3. This total regulatory alignment guarantees smooth market entry into Europe, the Americas, and beyond.
A1: Yes, we are the manufacturer. We have our own factory located in the provinces of Dongguan and Hunan, China.
A2: Yes. Customization will depend on the requirements of your requests.
A3: We accept standard product orders starting from 10 units. If needed, we can even customize your logo. For OEM, our sales team will review the detailed requirements and confirm minimum order quantity.
A4: Our company focuses on high quality batteries in India, North America, Europe, Korea and Japan markets.
A5: We accept T/T (bank transfer), PayPal, Western Union.
Address
Xin'an Village industrial Park, Yonglejiang Town, AnrenCounty, Chenzhou City, Hunan Province, China
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