Customer Case: INR18650-10500mAh-11V Battery Pack for Long-Running Portable Electric Fans |

Customer Case Study
18650 Li-ion · High Energy
Electric Fan

Pack: INR18650 · 11.1V · 10500mAh

11.1V 10500mAh 18650 Battery Pack for Long-Running Portable Electric Fans

A portable electric fan manufacturer needed a battery solution that could deliver long runtime, stable airflow performance,
and safe charging for daily household use. PKNERGY engineered a compact 3S 11.1V 10500mAh 18650 pack designed to support
continuous fan operation while keeping discharge stable and maintenance low.

Nominal Voltage

11.1V

Capacity

10500mAh

Max Continuous Discharge

Internal Resistance

≤ 80mΩ

Project highlight: For fan products, users value runtime and steady airflow.
We optimized for stable discharge, low internal resistance, and a clear operating window to improve reliability and safety.

Application Photo

Battery Photo

At a glance

Long runtime
Stable airflow power
3S 11.1V system
Production-ready

Customer Profile (Anonymous) & Project Context

The customer is a manufacturer of portable electric fans for household and light commercial use.
Due to confidentiality, we do not disclose the company name. Their product required a rechargeable battery pack that provides
long runtime with stable airflow output, while meeting practical safety thresholds for charging and discharging.

Application

Portable / stand electric fan

Primary Requirement

Long runtime + steady airflow

Key Concern

Safety window & batch consistency

Customer environment / device context (optional)

Challenges (What the customer needed to solve)

1) Long runtime under real usage

Users expect a fan to run for hours without frequent recharging. Capacity alone isn’t enough—stable discharge helps keep airflow consistent.

2) Stable voltage for steady airflow

Voltage sag can reduce motor speed and airflow. The customer needed a pack that keeps output stable through the discharge curve.

3) Safe charging & predictable cut-off thresholds

Consumer devices require a clear operating window. The pack needed consistent charge/discharge cut-off voltages and practical temperature guidance.

Engineering note

For motor loads like fans, we pay close attention to internal resistance and discharge stability.
This helps maintain consistent airflow and reduces user complaints in real-world conditions.

Solution (How PKNERGY engineered the pack)

PKNERGY delivered a 3S 18650 battery pack optimized for long-running fan applications. The design targeted stable motor drive,
predictable cut-off thresholds, and production-ready assembly for batch deployment.

Energy for Longer Runtime

10500mAh capacity supports extended operating time and reduces charging frequency.

Stable Motor Drive

Low internal resistance (≤ 80mΩ) helps reduce voltage drop and maintain steady airflow output.

Safe Operating Window

Charging cut-off 12.6V and discharge cut-off 9.0V provide predictable behavior and device protection.

Production-ready Assembly

Harness/connector readiness and wrapping options support stable mass production and easier service.

Technical Specifications

Parameter	Value
Model	INR18650
Nominal Voltage	11.1V
Nominal Capacity	10500mAh
Size	56.5 × 58.5 × 66.5 mm
Internal Resistance	≤ 80mΩ
Charging Cut-off Voltage	12.6V
Discharge Cut-off Voltage	9.0V
Maximum Constant Charging Current	2000mA
Maximum Continuous Discharging Current	3000mA
Cycle Life	≥ 300 cycles (80% DOD)
Weight	480g

Temperature Guidance (Project Reference)

Charge: 0–10°C (0.2C) · 10–35°C (0.2C) · 35–45°C (0.2C)
Discharge: -20–0°C (0.2C) · 0–10°C (0.3C) · 10–35°C (0.3C) · 35–60°C (0.3C)

Results & Customer Feedback

Longer fan runtime: improved user satisfaction and reduced recharging interruptions.
Steady airflow output: stable discharge helped keep motor speed consistent.
Reduced complaints: clear voltage window and reliable performance improved product stability.
Batch-ready delivery: consistent specs and structure supported production deployment.

“We needed a pack that runs longer and keeps airflow steady. With PKNERGY’s 11.1V solution, our fan performance became more consistent,
and we reduced customer complaints related to weak airflow after extended use.”

— Product Manager, Portable Fan Manufacturer (Anonymous)

Photo Gallery (Optional)

Add as many images as needed (battery photos, cell assembly, wiring, installation fit, testing photos, etc.). Duplicate or remove cards freely.

Caption: battery pack overview.

Caption: internal structure / BMS view.

Caption: application environment.

FAQ — Common Questions

Q1: What affects airflow stability in battery-powered fans?

Airflow depends on motor speed, which is sensitive to voltage. If the battery experiences voltage sag, airflow may weaken.
Low internal resistance and stable discharge help maintain consistent airflow over time.

Q2: What information do you need to customize a fan battery pack?

Provide motor voltage/current, speed levels (low/medium/high), expected runtime, pack space limits, connector type,
charging method, and device photos or drawings. Usage pattern helps estimate practical runtime needs.

Q3: Can you customize connectors and wrapping?

Yes. We can customize harness length, connector models, polarity, PVC wrapping/shrink, and labeling for your assembly line.

Q4: How do you ensure safety and batch consistency?

We align pack thresholds with the device needs and control key parameters such as IR window, voltage/capacity verification,
and charge/discharge cut-offs to reduce performance deviation across batches.

Need a custom battery for your fan or home appliance?

Share your motor voltage/current, target runtime, space limits, connector preference, and device photos.
Our engineers will propose a production-ready battery solution.

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Post time: Jan-05-2026