3.7V 300mAh Lithium Polymer Li-Po Rechargeable Battery with BMS

3.7V 300mAh Lithium Polymer Li-Po Rechargeable Battery with BMS is an ultra-thin, lightweight single-cell (1S) 3.7V rechargeable LiPo pouch battery equipped with an integrated Protection Circuit Module (PCM / BMS) and pre-soldered red (+) and black (-) wire leads. Encased in a laminated aluminum-polymer pouch with built-in overcharge, over-discharge, and short-circuit protection under the Kapton tape collar, it is ideal for wearables, Bluetooth audio receivers, GPS trackers, and compact ESP32/Arduino IoT nodes.

Key Features:

• Built-In PCM / BMS Protection Board: Integrated DW01A + dual MOSFET protection strip at the top of the cell automatically prevents overcharging (>4.25V), over-discharging (<2.75V), and short circuits.
• Ultra-Thin & Featherweight Pouch: Weighs only ~7g and slips into slim smartwatches, handheld enclosures, and wearable electronics.
• High Specific Energy & Low Self-Discharge: Retains charge over months of standby storage with zero memory effect.
• Pre-Tinned Red & Black Wire Leads: Ready to solder directly to a TP4056 charger, JST-PH 2.0mm connector, or microcontroller power pads.
• Long 500+ Cycle Service Life: Delivers consistent 3.7V nominal power across hundreds of CC/CV charge-discharge cycles.

Technical Specifications:

• Battery Chemistry: Lithium Polymer (Li-Po)
• Nominal Voltage: 3.7V DC (Full Charge: 4.20V DC)
• Rated Capacity: 300 mAh (1.11 Wh)
• Standard Charge Current: 0.5C (150 mA) | Max Charge Current: 1C (300 mA — set TP4056 Rprog accordingly)
• Max Continuous Discharge Current: 1C (300 mA)
• Onboard PCM Protection Thresholds: Overcharge ~4.25V | Over-Discharge ~2.75V | Overcurrent ~1.5A
• Operating Temperature: Charge: 0°C to +45°C | Discharge: -20°C to +60°C

Mechanical Specifications:

• Cell Form Factor: Prismatic Laminated Aluminum-Polymer Pouch (e.g. 602030 / 502030 size class)
• Collar Insulation: Amber Polyimide (Kapton) Tape Protecting the BMS Strip
• Output Leads: Red (+3.7V) and Black (GND) Insulated Stranded Wires

Dimensions:

• Length: ~30 mm to 35 mm
• Width: ~20 mm
• Thickness: ~5.0 mm to 6.0 mm
• Weight: ~7.5 g

Pinout and Wiring:

• Red Wire (BAT+): Positive 3.7V battery terminal (post-BMS protected output).
• Black Wire (BAT-): Negative 0V battery ground terminal.
• Charging Note: When charging with a standard 1A TP4056 module, either use a 300mA current-limited charger or replace the TP4056 Rprog resistor (1.2kΩ → 4kΩ for 300mA) to avoid charging above 1C.

Datasheet Reference:

• Protection Circuit Architecture: DW01A 1-Cell Li-Ion/LiPo Protection IC + 8205A Dual N-Channel MOSFET

Commonly Used in:

• Wearable Health Monitors, Smart Bands, and Pedometer Badges
• Bluetooth TWS Cases, Wireless Neckbands, and Mini MP3 Players
• Compact ESP32-C3, nRF52840, and LoRa Wireless Sensor Nodes
• Miniature GPS Asset Trackers and Pocket Gadgets

Applications:

• Provides a safe, self-protected 3.7V rechargeable battery for custom PCB enclosures where an 18650 cylinder is too bulky.
• Powers low-power BLE/Zigbee sensors and RTC backup circuits for days or weeks on a single charge.
• Replaces swollen or aged 300mAh LiPo cells inside Bluetooth speakers, wireless mice, and dashcams.

Equivalent Models:

• 300mAh 3.7V Rechargeable Li-Polymer Battery with Protection Circuit and Wires: Direct 300mAh protected LiPo pouch equivalent.
• 100mAh 3.7V Rechargeable Li-Polymer Battery with Protection Circuit and Wires: Ultra-miniature 100mAh pouch cell for even smaller wearables.
• 1000mAh 3.7V Rechargeable Li-Polymer Battery with Protection Circuit and Wires: Larger 1000mAh pouch cell for extended runtime.

Package Includes:

• 1 × 3.7V 300mAh Lithium Polymer Li-Po Rechargeable Battery with BMS