HCY 802540 3.7V 800mAh Lithium Polymer pouch cell battery with 2-pin connector and protection PCB

1. Product Overview

The HCY 802540 3.7V 800mAh 25C Lithium Polymer battery is a compact rechargeable LiPo pouch cell designed for applications that require high power from a lightweight battery.

The supplied battery is clearly marked HCY 802540, 3.7V, 800mAh and 25C. With an 800mAh capacity at 3.7V nominal voltage, it provides approximately 2.96Wh of nominal energy.

Its compact pouch construction and high-discharge rating make it particularly suitable for compatible drones, RC products and portable electronic equipment.

2. Electrical Specifications

• Brand: HCY
• Model / Size Code: 802540
• Battery Chemistry: Lithium Polymer (LiPo)
• Cell Configuration: 1S / Single Cell
• Nominal Voltage: 3.7V
• Rated Capacity: 800mAh / 0.8Ah
• Rated Energy: 2.96Wh
• Discharge Rate: 25C, as marked on the battery
• Maximum Charge Voltage: 4.2V
• Rechargeable: Yes

The 2.96Wh energy value is calculated from 3.7V × 0.8Ah.

3. Physical Specifications

• Battery Type: Flat LiPo pouch cell
• Nominal Cell Size: approximately 8 × 25 × 40 mm
• Model Size Code: 802540
• Positive Lead: Red wire
• Negative Lead: Black wire
• Connector: Pre-fitted 2-pin connector
• Protection / interface section: Located at the wire end of the supplied battery

Understanding the 802540 Size Code

The model number normally refers to the approximate bare-cell dimensions:

• 80 → approximately 8.0 mm thickness
• 25 → approximately 25 mm width
• 40 → approximately 40 mm length

The finished battery can be slightly larger because of the PCB, insulation, wires, connector and manufacturing tolerance.

4. High-Discharge 25C Rating

The supplied cell is marked 25C, indicating that it is intended for relatively high-discharge applications compared with ordinary low-current LiPo pouch cells.

This makes the battery useful for applications where short bursts of higher power may be required, such as compatible:

• Mini drones
• Quadcopters
• RC aircraft
• RC toys
• Robotics
• Motor-driven electronic projects

The actual permissible current should always be kept within the battery manufacturer’s and equipment manufacturer’s limits.

5. Suitable Applications

Suitable applications may include:

• Drones and quadcopters
• RC helicopters
• RC aircraft
• RC toys
• Robotics
• Portable electronic devices
• DIY electronic projects
• Battery-powered prototypes
• Compact high-current electronics

Compatibility depends on the exact voltage, connector, polarity, dimensions and current requirement of the device.

6. Charging & Usage

This is a 1S 3.7V Lithium Polymer battery and should only be charged using a charger designed for single-cell Li-ion / LiPo batteries.

• Nominal voltage: 3.7V
• Maximum charge voltage: 4.2V
• Use a proper 1S LiPo charging circuit
• Observe correct positive and negative polarity
• Do not use a charger intended for a different battery chemistry or cell count
• Confirm the connector polarity before plugging into equipment

7. Advantages of LiPo Pouch Cells

• High power-to-weight ratio
• Flat and compact construction
• Rechargeable
• High energy density
• Suitable for space-constrained devices
• High-discharge variants suitable for RC and drone applications
• Lightweight compared with many conventional battery formats

8. Compatibility Note

Before purchasing, verify all of the following:

• Battery voltage: 3.7V nominal
• Battery capacity: 800mAh
• Discharge requirement: compatible with the 25C cell
• Physical dimensions: approximately 8 × 25 × 40 mm nominal cell size
• Connector type
• Connector polarity
• Wire orientation
• Maximum charge voltage: 4.2V
• Available space inside the device

Having the same voltage and capacity does not automatically guarantee compatibility.

9. Safety Note

Lithium Polymer batteries must be handled carefully.

• Do not puncture or crush the pouch
• Do not bend or deform the battery
• Do not short-circuit the terminals
• Do not reverse polarity
• Do not charge above the specified voltage
• Do not expose to fire or excessive heat
• Do not use a swollen, leaking or physically damaged battery
• Always use a compatible LiPo charger