124065 3.7V 4000mAh Rechargeable Pouch Battery

The Ufine 124065 is a 3.7V 4000mAh rechargeable LiPo battery with 14.8Wh of nominal energy. It uses a single pouch cell with a protection board.

For a new project, assess the energy needed between charges and the space available inside the device. Then test the complete battery assembly under real use conditions.

Part 1. Turn your runtime target into an energy budget

Start with the power used by the device and the required operating time. Use Wh when comparing loads that run at different voltages.

Required battery energy (Wh) ≈ device power (W) × runtime (hours) ÷ power conversion efficiency

• Example device load: 2W.

• Target runtime: five hours.

• Assumed conversion efficiency: 85%.

• Estimated battery energy needed: 2 × 5 ÷ 0.85 ≈ 11.8Wh.

The 124065 has 14.8Wh of nominal energy. This provides room in the initial budget, but it does not guarantee five hours of operation. Confirm usable energy, shutdown voltage, temperature, and battery aging in device tests.

Part 2. Compare different 4000mAh battery shapes

The 124065 has a listed maximum size of 12 × 40 × 67mm. A battery with the same capacity may use a different shape.

• 124065: 12 × 40 × 67mm maximum.

• 104867: 10 × 48 × 69mm maximum.

The 104867 is thinner but wider and longer. Choose the format that fits the enclosure with room for wiring and clearance. Also compare current ratings and protection details before treating either model as a replacement.

Part 3. Separate capacity needs from current needs

A 4000mAh rating describes stored charge. It does not, by itself, define the current available to the device.

The detailed specification lists 800mA as the standard discharge current. Higher loads need a review of the finished assembly, including the PCM, wires, and connector.

• Record normal current in each device mode.

• Measure short peaks during startup or motor operation.

• Test functions that can run at the same time.

• Repeat the highest-load task near the end of a charge.

Share the peak value and its duration. This helps identify whether voltage drop, protection settings, or connection losses could affect operation.

Part 4. Allow enough time and space for charging

Use a single-cell Li-ion CC/CV charging circuit with a 4.2V charge limit. The listed standard charge current is 800mA. Confirm the final charge setting against the approved battery specification.

Dividing 4000mAh by 800mA gives five hours. This is a rough estimate, not the full charging time. Current falls during the final charging stage.

• Measure charging time from a defined starting charge level.

• Check battery temperature with the enclosure closed.

• If the device runs while charging, review how input power is shared.

• Confirm temperature sensing needs. The standard version has no NTC sensor.

A higher charger setting needs a separate review. Check the battery rating, input supply, wiring, and heat inside the device together.

Part 5. Set clear pass targets for 124065 samples

Define what a successful sample must achieve before testing starts. Use the final enclosure and the device settings planned for production.

• Runtime: reach the target under a defined use pattern.

• Peak load: complete demanding tasks without resets or unexpected shutdowns.

• Charging: stay within the approved voltage, current, and temperature limits.

• Assembly: fit without pressure on the pouch or pinched wires.

• Standby: retain enough charge for the planned time between uses.

Keep the battery version, test temperature, starting charge level, and shutdown point with each result. This makes sample comparisons easier to repeat.

Part 6. Prepare the 124065 specification for ordering

Use one approved specification and drawing for the sample and production order. Record any changes to the connector, wires, protection board, or insulation.

• Battery model, capacity, and drawing revision.

• Connector part number, mating socket, and polarity.

• Wire length, gauge, and exit direction.

• Approved current limits, PCM settings, and any NTC requirement.

• Sample quantity, order quantity, and required project documents.

The supplied product information lists an MSDS. This provides safety information and is not a product certification. Tell us which additional model-specific reports your project needs so availability and scope can be reviewed.