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3.7V 650mAh Lithium Polymer (LiPo) Rechargeable Battery (with Protection Circuit)

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The 3.7V 650mAh Lithium Polymer (LiPo) Battery provides an excellent balance of physical size and power capacity, making it a go-to power source for portable and wearable electronics. Unlike rigid cylindrical cells (like the 18650), LiPo batteries utilize a flexible foil pouch, allowing them to be incredibly thin and lightweight. This specific 650mAh cell offers enough juice to keep low-power microcontrollers and wireless modules running for extended periods without adding unnecessary bulk to your enclosure.

Most standard models come equipped with a pre-attached standard 2-pin JST-PH connector, allowing for instant plug-and-play compatibility with popular development boards and charging modules. Crucially, it features an integrated Protection Circuit Module (PCM) hidden under the Kapton tape at the top of the cell, ensuring safe operation during both charging and discharging phases.

Key Features & Functional Advantages:

  • Integrated Protection Circuit (PCM): The built-in micro-BMS automatically cuts off power to prevent catastrophic over-charging (past 4.2V), over-discharging (below 3.0V), and accidental short-circuits, protecting both the battery and your hardware.

  • High Energy Density: Packs 650mAh of capacity into a footprint roughly the size of a matchbook, maximizing runtimes for space-constrained projects.

  • Standardized JST Connector: Typically terminated with a 2.0mm or 1.25mm pitch JST connector, making it instantly compatible with standard lithium charging boards (like the TP4056) and standard microcontroller battery ports.

  • Low Self-Discharge Rate: Holds its charge exceptionally well when not in active use, ensuring your device is ready to power on even after sitting idle for weeks.

  • Flexible Form Factor: The soft-pack pouch design allows it to be squeezed into tight, custom 3D-printed enclosures where traditional cylindrical batteries simply cannot fit.

Perfect For:

  • IoT & Embedded Systems: An ideal power source for compact ESP32, STM32, and Arduino-based sensor nodes requiring reliable 3.3V/3.7V power for Wi-Fi or Bluetooth transmissions.

  • Wearable Technology: Thin and light enough to be embedded inside smartwatches, fitness trackers, biometric monitors, and electronic cosplay props.

  • Micro RC & Drones: Delivers the necessary sustained current draw required by small brushed DC motors in micro quadcopters (Whoops) and lightweight indoor RC planes.

  • Portable Audio Devices: Excellent as a replacement battery for small Bluetooth speakers, wireless headphones, and portable MP3 players.

Technical Specifications:

  • Battery Chemistry: Lithium Polymer (Li-ion / LiPo)

  • Nominal Capacity: 650mAh

  • Nominal Voltage: 3.7V

  • Fully Charged Voltage: 4.2V

  • Discharge Cut-off Voltage: ~3.0V

  • Standard Connector: 2-Pin JST-PH (Verify pitch size, usually 2.0mm or 1.25mm, before purchase)

  • Approximate Dimensions: 40 mm x 25 mm x 6 mm (L x W x H)

  • Approximate Weight: 15 grams

  • Wire Length: ~50mm to 100mm (Depending on manufacturer)

Ensure your order is placed by 2PM to guarantee next-day delivery! Our commitment to prompt service includes a 24-hour delivery system through our network of carriers, aimed at ensuring your package arrives right on schedule.

Please note, a delivery fee of €4.99 applies for orders under €50. For those in remote areas, be aware that our couriers may apply an extra surcharge. This additional fee helps cover the costs of transporting your items to harder-to-reach locations.