We build power tool packs with genuine Tier-1 cells, offer lot traceability and compliance documents on request, and QC-screen every batch for consistent bulk performance.

Engineered for High-Discharge Excellence

  • Rugged Design

    Shock-resistant casing and secure interconnects designed to endure vibration and impacts on construction sites.

  • Consistent Power Curve

    Maintains a flat discharge curve, ensuring your tool works at near-peak performance until the battery is depleted.

  • Extended Cycle Life

    Rated for 500+ charge cycles at 80% capacity retention under normal use. Operational range: -20°C to +60°C.

  • High Discharge Rate

    Supports continuous high-current draw (15C or ~45A per cell). Zero lag in torque for heavy-duty applications.

  • Minimal Heat Buildup

    Low internal resistance cells and smart design result in excellent heat control, extending service life.

  • Intelligent BMS

    Monitors cell health, balance, and temperature. Provides safety cut-offs for over-charge, over-discharge, and current spikes.
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Tailored to Your Voltage & Capacity Needs

Configurable from 18V to 36V with various cell options to match your power requirements.

CELL MODEL (BRAND) FORMAT CAPACITY (MAH) CONT. DISCHARGE TYPICAL APPLICATION
Samsung
INR18650-25R		 18650 2,500 20A (8C) 18V packs (drills/drivers) - balanced power & runtime
Samsung
INR21700-50S		 21700 2,000 30A (15C) High-drain tools (impact wrenches/saws) - max power
Molicel INR21700-P42A 21700 4,200 45A (≈10C) 36V or 18V heavy-duty tools - extreme current
Sony/Murata VTC6 18650 3,000 15A (5C) Higher capacity needs with moderate discharge
LG INR21700-M50LT 21700 5,000 15A (3C) Long-runtime industrial equipment

Your Trusted B2B Partner

More than just a supplier – we provide end-to-end solutions from design to certification.

Comprehensive Safety Certifications

Products meet UN38.3, IEC62133, and UL1642 standards. We provide CE, RoHS, and MSDS documentation for smooth global customs clearance.

Rigorous Quality Control (QC)

We apply AQL standards. Every batch of cells is tested for voltage and resistance. Finished packs undergo cycling tests with ±2% batch consistency.

In-Depth OEM Engineering Support

From cell selection and BMS tuning to custom housing molds and branding labels, we offer one-stop engineering services.

Reliable Supply & Fast Delivery

1-2 weeks for prototypes, 3-4 weeks for mass production. Experienced in dangerous goods logistics for compliant air/sea shipping.

UN38.3

CE / RoHS

ISO 9001

Real-World Performance Success

See how our partners achieve market success with STEC battery solutions.

Case 1: Cordless Drill OEM

CHALLENGE

Competitors offered longer runtime; client needed to boost market competitiveness.

SOLUTION

STEC custom 5S2P pack (Samsung 35E/25R) with smart BMS.

25% longer runtime while maintaining high torque.

Case 2: Rebar Tying Tool Mfg

CHALLENGE

High current bursts caused overheating and shutdowns, affecting construction efficiency.

SOLUTION

10S1P pack with Molicel P42A cells & optimized MOSFET thermal design.

Zero overheating shutdowns; significantly reduced downtime.

Case 3: European Tool Wholesaler

CHALLENGE

Inconsistent battery quality, high return rates, and customs clearance issues.

SOLUTION

STEC provided fully certified, private-label packs.

40% reduction in QC issues & faster customs clearance.

Frequently Asked Questions

What is a "High-Rate" battery?

It refers to batteries capable of continuous 8C-15C (e.g., 30A+) discharge without overheating. This is essential for power tools that require intense bursts of power, unlike standard batteries that may suffer voltage drop.

How do you ensure cells are genuine?

We source directly from authorized manufacturers and verify every batch via barcode traceability, capacity, and internal resistance testing. We can provide original COA certificates and batch test reports.

What is the cycle life of the packs?

Our high-rate NMC/NCA packs typically deliver 500+ full charge-discharge cycles (retaining 80% capacity), which equates to roughly 2 years of daily professional use. Lighter use will extend lifespan further.

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