Lithium Polymer Battery 401020 55mAh 3.7V
Summary of 401020 55mAh 3.7V Battery
The Lithium Polymer Battery 401020 55mAh 3.7V is an ultra-compact and lightweight rechargeable battery designed for small, low-power consumer electronics. Despite its tiny size and weight under 2g (with protection board), it offers high energy density, excellent safety features, and a long cycle life — maintaining over 80% capacity after 500 deep cycles. With its wide operating temperature range (-20°C to 65°C) and customizable options, it’s an ideal choice for wearable devices, mini IoT sensors, and other portable applications that demand efficiency and reliability.
Battery 401020 Technical Information
Model: 401020
Battery Type: Lithium Polymer Battery
Nominal Capacity: 55mAh
Nominal Voltage: 3.7V
Nominal Energy: 203.5mWh
Energy Density: 107.11Wh/kg
Charge Cut-off Voltage: 4.2V
Discharge Cut-off Voltage: 3.0V
Standard Charge Current: 0.2C (11mA)
Max Charge Current: 1C (55mA)
Standard Discharge Current: 0.2C (11mA)
Max Continuous Discharge Current: 1C (55mA)
Max Peak Discharge Current: 2C (110mA)
Internal Resistance: Less than 350mΩ
Cycle Life: More Than 500 Cycles
Dimensions: 4 × 10 × 20 mm
Weight: 1.7g
Charge Temperature Range: 0°C to 45°C
Discharge Temperature Range: -20°C to 65°C
Storage Temperature Range:
- -20℃~25℃: More than 12 months
- -20℃~45℃: Less than 3 months
- -20℃~60 ℃: Less than 1 month
PCB: Yes
Connector: Bare wires, PH2.0, Molex etc
Key Features
⚡ High Energy Density, Lightweight Design
The 401020 Li-Polymer battery stands out for its exceptional energy density — providing maximum power output within a small footprint. Its compactness and lightness make it perfect for wearable devices, wireless sensors, smart pens, hearing aids, and Bluetooth accessories.
Energy density: Optimized for compact electronics requiring long-lasting power.
Weight: Less than 2 grams (including protection board), minimizing device load.
Dimensions: Only 4mm (thickness) × 10mm (width) × 20mm (length) — roughly the size of a fingertip.
🛡️ Comprehensive Protection Circuit (PCM Built-In)
Safety is a top priority. The built-in protection board (PCM) ensures reliable performance and device protection through multiple safeguards:
✅ Overcharge protection
✅ Over-discharge protection
✅ Overcurrent protection
✅ Short-circuit protection
✅ Over-temperature protection
🔁 Long Cycle Life and Consistent Performance
Engineered with premium lithium polymer cells, this 3.7V 55mAh battery delivers:
🔋 Over 500 charge-discharge cycles while retaining ≥80% of initial capacity.
💪 Stable voltage output for consistent device operation.
🔄 Low self-discharge rate, ensuring readiness even after long storage periods.
🌡️ Wide Temperature Range and Reliable Operation
Designed for real-world conditions, the battery operates efficiently from -20°C to +65°C.
Whether in cold winter environments or warm indoor setups, the 401020 battery maintains reliable performance — making it ideal for outdoor sensors, medical wearables, and portable gadgets.
⚙️ Customizable Options for Your Application
To meet specific project needs, Cestpower provides full OEM and customization support:
📐 Custom sizes and shapes
⚡ Adjustable capacity configurations
🔌 Different connector types and wire lengths
🏷️ OEM branding and labeling
💼 Applications
The Lithium Polymer Battery 401020 55mAh 3.7V is ideal for:
Smart wearable devices
Miniature medical instruments
Bluetooth headsets and beacons
Wireless sensors and transmitters
Consumer electronics and IoT modules
❓ FAQ – Frequently Asked Questions
Q1: What devices can use the 401020 Li-Polymer battery?
A: It’s suitable for low-power electronic products like smartwatches, Bluetooth devices, medical sensors, and mini IoT tools.
Q2: Does the battery include protection circuitry?
A: Yes, the battery includes a built-in PCM with protection against overcharge, over-discharge, overcurrent, short circuit, and overheating.
Q3: Can I customize the battery for my project?
A: Absolutely. Cestpower offers custom dimensions, capacities, terminals, and OEM branding to meet your design specifications.
Q4: How long is the typical lifespan of this battery?
A: The cycle life exceeds 500 cycles, maintaining over 80% capacity after deep cycling.
Q5: What is the operating temperature range?
A: It works efficiently from -20°C to +65°C, supporting performance in both cold and hot conditions.
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