Client Cases: INR18650 2600mAh 7.4V Battery Pack for Portable POS Terminals |

Customer Case Study
Payment / POS Terminal
Stable Runtime

Pack: INR18650 · 7.4V · 2600mAh · 3A

7.4V 2600mAh INR18650 Battery Pack for Portable POS Terminals

A POS terminal customer needed a rechargeable pack that could power handheld payment devices with
stable output, safe charge/discharge limits, and reliable batch consistency.
PKNERGY supplied a compact 7.4V 2600mAh (2S) INR18650 pack designed for frequent daily charging and
steady performance during payment processing, receipt printing, and wireless communication load.

Nominal Voltage

7.4V

Capacity

2600mAh

Max Continuous Discharge

Charging Current (Max)

Project highlight: POS devices face frequent charge cycles and peak loads (printing + wireless).
We focused on stable voltage, safe thresholds, and connector/harness reliability for production use.

Application Photo

Battery Photo (Pack)

At a glance

Frequent charge-ready
Stable output
8.4V / 6.0V thresholds
Connector reliability

Introducing the Customer (Anonymous) & Their Journey

The customer is a POS device manufacturer supplying handheld payment terminals to retailers and service businesses.
Due to confidentiality, we do not disclose the company name. For this case study, the project representative is described as a realistic anonymous profile.

Project Contact

Carlos Mendes

Product Engineer, POS Hardware

Country / Region

Portugal (EU Market)

Daily use in retail stores

Typical Use Case

Handheld POS terminals used for card/contactless payments, receipt printing, and Wi-Fi/4G communication during peak hours.

Operating Temperature

Discharge: -20°C to 60°C (typical indoor 10°C to 35°C)
Charge: 10°C to 35°C (recommended)

Customer’s goal: keep POS terminals running reliably through busy shifts, ensure safe charging behavior,
and reduce after-sales issues caused by unstable battery performance.

Customer environment / retail usage (optional)

Challenges (What the customer needed to solve)

1) Peak load stability during printing & communication

POS terminals may draw higher current during receipt printing, NFC scanning, and wireless transmission.
The battery must handle short peaks without brownout or restart.

2) Safe charging behavior for daily cycles

Retail staff frequently charge devices. Defined cut-offs and stable pack assembly reduce overheating and misuse risk.

3) Connector & harness reliability

Repeated docking and handling can stress cables and connectors. The customer required consistent termination quality for production.

Engineering note

For POS devices, real issues usually come from peak current events and daily charging behavior.
We recommend validating voltage under print peaks and aligning QC on harness/connector consistency.

Solution (How PKNERGY engineered it)

PKNERGY supplied a 2S INR18650 pack built around stable daily-use needs: controlled internal resistance, clear cut-off limits,
and production-ready harness/connector quality to withstand repeated handling and docking.

Stable Output Under Daily Load

Supports up to 3A continuous discharge with stable behavior to reduce brownout risk during peak usage.

Defined 2S Thresholds

Charge cut-off 8.4V and discharge cut-off 6.0V for predictable pack control and safety margin.

Daily Charging Support

Up to 2A constant charging current helps balance turnaround time and thermal control.

Harness & Connector QC

Reinforced termination and outgoing inspection to reduce loose contact and after-sales issues.

Technical Specifications

Parameter	Value
Model	INR18650
Nominal Voltage	7.4V
Nominal Capacity	2600mAh
Size	20.5 × 37.5 × 68.5 mm
Internal Resistance	≤ 140mΩ
Charging Cut-off Voltage	8.4V
Discharge Cut-off Voltage	6.0V
Maximum Constant Charging Current	2A
Maximum Continuous Discharging Current	3A
Cycle Life	≥ 300 cycles (80% DOD)
Weight	118g

Temperature Guidance (Project Reference)

Charge Temperature: 0–10°C (0.2C) · 10–35°C (2A) · 35–45°C (0.2C)
Discharge Temperature: -20–0°C (0.2C) · 0–10°C (0.5C) · 10–35°C (3A) · 35–60°C (0.5C)

Results & Customer Feedback

Fewer device resets: stable output reduced brownout during peak usage events.
Safer daily charging: clear thresholds and stable charging behavior improved reliability.
Lower after-sales issues: harness/connector QC reduced loose-contact faults.
Batch repeatability: consistent assembly supported production supply.

“Battery stability was critical for our POS terminals—especially during printing and peak-hour transactions.
PKNERGY helped us improve reliability with stable output and solid connector quality, reducing our after-sales issues.”

— Carlos Mendes, Product Engineer (Portugal) (Anonymous profile)

Photo Gallery (Optional)

Replace each image URL with your WordPress Media Library link. Duplicate or remove cards freely.

Caption: pack overview (label & harness).

Caption: cells & PCB detail.

Caption: retail POS usage scene.

FAQ — Common Questions

Q1: What causes POS terminals to reset unexpectedly?

Resets often come from voltage drop during peak loads (printing, NFC, wireless transmission) or unstable connectors.
A pack with stable discharge behavior and consistent harness quality helps reduce brownout events.

Q2: Why are 8.4V / 6.0V cut-off voltages used for a 7.4V pack?

A 7.4V pack is typically a 2S lithium system. 8.4V is the full-charge voltage (4.2V × 2),
and 6.0V helps avoid deep discharge and supports safer operation and longer service life.

Q3: What information do you need to customize a POS battery pack?

Please share voltage, average/peak current, desired runtime, device space constraints, connector type,
charging method (dock/adapter), and installation photos. If you have a load profile (printing peak), even better.

Q4: Can you support mass production with stable quality?

Yes. We align QC on the most sensitive points: IR consistency, capacity checks, voltage thresholds,
and harness/connector outgoing inspection to keep batch performance stable.

Need a custom battery for POS terminals?

Share your device model, peak load (printing), runtime, connector, and enclosure photos.
Our engineers will propose a production-ready battery solution.

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Post time: Jan-06-2026