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3.7v 40mah battery
3.7v 40mah lipo polymer battery

301020 CE ROHS battery 40mAh

The 301020 Li-ion Polymer Battery offers a compact and lightweight power solution with a capacity of 40mAh and a nominal voltage of 3.7V. Its slim rectangular shape makes it ideal for miniature and space-constrained devices. Perfect for hearing aids, Bluetooth devices, wearable sensors, smart pens, medical tools, and other compact electronics requiring low-power consumption.

Additional information

Product Type

Li-Polymer battery
Model number

301020
Voltage (Nominal)

3.7V
Capacity (Nominal)

40mAh
Dimensions

3.0±0.2*20±0.5*40±2.5mm
Constant Discharge Current

Typically 0.5C-1C
Working Temperature

charge: 0-45℃; discharge: -20-60℃
Certifications

IEC62133/CE/ROHS/UN38.3/MSDS
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301020 CE ROHS battery 40mAh

Product description

Lithium Polymer (LiPo) batteries are lightweight, thin-profile rechargeable batteries widely used in modern electronics. Thanks to their flexible form factor and high energy density, they are ideal for space-constrained applications where performance and design matter.

Product features

  • High Energy Density: More power in a compact size

  • Ultra-Thin & Lightweight: Perfect for slim devices and wearables

  • Customizable Shapes & Sizes: Tailored to your device’s design

  • Stable Discharge Voltage: Consistent performance across cycles

  • Low Self-Discharge: Maintains charge even during long storage

  • Built-in Protection Circuit (PCM/BMS): Enhanced safety and battery life–It’s optional

Product details

301020

Basic Information

Cell Dimension( thickness*width*length)3.0±0.2*10±0.5*20±0.5mm
Charge voltage4.2V±0.03V
Nominal voltage3.7V
Nominal capacity40mAh
Fully charge voltage4.2V
Ship out voltage3.8-4.1V
Battery specificationCharge currentStandard Charging:0.2C (8mA)
Rapid charge:1.0C(40mA)
Charging methodCharge with constant current 0.2c to 4.2V, then charge with constant voltage 4.2V till until charge current is less than 0.01C
Standard discharge current0.2C(8mA)
Max.discharge current1.0C(40mA)
Discharge cut-off voltage2.75V
Operating environmentCharging:0℃~45℃
Discharging:-20℃~60℃
Storage temperatureless than one month -20℃~40℃; less than half year -20℃~30℃
PCB&Wires&connectorOptional
 Cycles300-500 times
Warranty12 months
CertificatesIEC62133/CE/ROHS/UN38.3/MSDS
WarningDo not overcharge, force charge, short circuit, disassemble, deform, heat, or place the battery near a direct flame. Any of the above actions could cause it to ignite, explode or become damaged.
Keep this battery out of the reach of children.
When storing the battery or throwing it away, be sure to cover it with tape.
Main FeaturesThin format, lightweight, flat size, and flexibility in design.
Easily customized, Energy density, High capacity.
ApplicationsWearable devices: smart watches, smart glasses, smart clothes, smart shoes.
Electric tools: saws, electric drill, electric toys, remote control devices.
Medical devices: portable electronic medical devices, hearing aids, electric wheelchairs.
IoT devices: sensor, GPS trackers, wireless modules and so on.

Product assemble

Why Choose LithoTop’s LiPo Batteries?

At LithoTop, we combine advanced manufacturing with expert engineering to deliver LiPo batteries that are safe, efficient, and perfectly matched to your product. With full customization, fast prototyping, and global delivery, we ensure your power solution meets every demand.

Frequently Asked Questions

LiPo batteries are lightweight, have a thin and flat form factor, support custom shapes, and offer high discharge rates. They’re widely used in drones, RC devices, smartphones, wearables, and medical equipment.

Yes, when properly designed with a protection circuit (PCM/BMS) and used within specified limits, LiPo batteries are safe. LithoTop applies strict quality control and includes safety mechanisms to ensure safe operation.

A typical LiPo battery lasts around 300–500 full charge cycles, depending on usage conditions, charge/discharge rates, and temperature. Proper care can extend the lifespan significantly..

Absolutely. LithoTop offers custom LiPo battery solutions, including voltage, capacity, size, connector type, and protection features—tailored to your product requirements.

Store in a cool, dry place between 20–25°C. Batteries should be partially charged (around 40–60%) and stored away from heat sources or direct sunlight. Avoid long-term full charge or full discharge storage.

Our LiPo batteries comply with major international standards, including CE, RoHS, UN38.3, MSDS, and more. Certification support is available based on your application and market.

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