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Chargers, Batteries & Power Supplies
Power Banks & Power Station
  • External Battery ROMOSS PMT40 Powerful 40000mAh 65W Dual Way Fast Charging Power Bank for Laptop Power Supply
  • External Battery ROMOSS PMT40 Powerful 40000mAh 65W Dual Way Fast Charging Power Bank for Laptop Power Supply
  • External Battery ROMOSS PMT40 Powerful 40000mAh 65W Dual Way Fast Charging Power Bank for Laptop Power Supply
  • External Battery ROMOSS PMT40 Powerful 40000mAh 65W Dual Way Fast Charging Power Bank for Laptop Power Supply
  • External Battery ROMOSS PMT40 Powerful 40000mAh 65W Dual Way Fast Charging Power Bank for Laptop Power Supply
  • External Battery ROMOSS PMT40 Powerful 40000mAh 65W Dual Way Fast Charging Power Bank for Laptop Power Supply
External Battery ROMOSS PMT40 Powerful 40000mAh 65W Dual Way Fast Charging Power Bank for Laptop Power Supply

External Battery ROMOSS PMT40 Powerful 40000mAh 65W Dual Way Fast Charging Power Bank for Laptop Power Supply

  • 1 - 99 Pieces
    $48
  • 100 - 499 Pieces
    $46
  • 500 - 999 Pieces
    $44
  • >= 1000 Pieces
    $42
View product details

External Battery ROMOSS PMT40 Powerful 40000mAh 65W Dual Way Fast Charging Power Bank for Laptop Power Supply

Product overview

Core functionalities

Applicable scenarios

Unique advantages

  • High-Capacity Power Supply: 40000mAh capacity provides extended power for laptops, smartphones, and other devices, supporting multiple recharge cycles.
  • Dual-Way 65W Fast Charging: Equipped with Adaptive Fast Charge technology (QC3.0), it delivers rapid charging for laptops and USB-C/USB-A devices while maintaining safety and efficiency.
  • Multi-Port Versatility: Features Type-C and USB-A ports for simultaneous charging of multiple devices, ensuring compatibility with both modern and legacy devices.

Key features

  • 1. Material Technology

    • With a corrosion-resistant aluminum alloy body, you can ensure durability in rugged environments, outlasting plastic models*.

  • 2. Interactive Design

    • With a built-in LED display and dual USB-C/USB-A ports, you can monitor battery levels and charge two devices simultaneously, unlike single-port models*.

  • 3. Performance Parameters

    • With 65W output power and 40000mAh capacity, you can achieve fast charging for laptops and smartphones, up to 3x faster than standard 18W chargers*.

  • 4. Scenario Solutions

    • With laptop compatibility and a compact design, you can power high-demand devices during travel or home use, ideal for multi-device setups*.

  • 5. Certification Standards

    • With QC3.0 fast charging certification, you can ensure safe and efficient charging adherence to industry standards, optimizing device compatibility*.

Product details

External Battery ROMOSS PMT40 Powerful 40000mAh 65W Dual Way Fast Charging Power Bank for Laptop Power Supply

The ROMOSS PMT40 External Battery is a high-capacity, fast-charging power bank designed for powering laptops and devices on the go. With a 40000mAh capacity and 65W Adaptive Fast Charge, it delivers reliable energy for multiple devices while maintaining portability. Its durable aluminum build and versatile Type-C interface ensure compatibility with modern tech, making it ideal for professionals, travelers, and tech enthusiasts.

Technical specifications

FeatureSpecificationBenefit
Capacity40000mAhPower multiple devices for extended use
Output Power65W (Type-C)Charges laptops and smartphones 50% faster than standard power banks
Charging TechnologyQC3.0, Adaptive Fast ChargeOptimizes speed for devices like tablets and gaming consoles
Ports1x USB-C (65W) + 2x USB-ASimultaneously charge three devices at once
MaterialAluminum alloyDurable, lightweight, and heat-resistant design

Customization guide

Adjustable parameters:

  • Voltage Output: Customize between 5V-20V to match device requirements (e.g., laptops vs. smartphones).
  • Port Configuration: Swap USB-A ports with additional USB-C ports for premium devices.
  • Safety Settings: Enable/disable fast charging modes to extend battery lifespan for low-power use cases.

Get inspired

Whether you’re on a business trip, outdoor adventure, or gaming marathon, the ROMOSS PMT40 ensures uninterrupted power. Its laptop compatibility and adaptive charging make it a全能 (versatile) solution for professionals and tech-savvy users who demand reliability without sacrificing portability.

Choose your model

ParameterBase Model (20000mAh)Advanced Model (30000mAh)Pro Model (40000mAh)
Capacity20000mAh30000mAh40000mAh (+100% vs Base)
Max Output Power30W45W65W (+117% vs Base)
Ports1x USB-A1x USB-C + 1x USB-A2x USB-C + 2x USB-A
Laptop SupportLimited (≤15W)Basic (30W)Full (65W)

Supplier's note

  1. Technical Breakthroughs:

    • Adaptive Fast Charge: Automatically adjusts voltage for devices like MacBook or Nintendo Switch, reducing charge time by 40%.
    • 65W Output: Industry-leading power for laptops, surpassing standard 30W portable chargers.
    • Aluminum Housing: 30% lighter than plastic alternatives while resisting drops and temperature fluctuations.

  2. Version Selection Guide:

    • Base Model: Ideal for casual users needing phone/tablet charging (e.g., students, daily commuters).
    • Advanced Model: Targets hybrid workers requiring occasional laptop boosts and multi-device support.
    • Pro Model: Designed for heavy users (e.g., content creators, travelers) needing full laptop charging and simultaneous high-speed device syncing.

With the Pro Model’s 65W output, you can fully charge a 15-inch laptop in 2 hours—20% faster than competitors. Pair its rugged aluminum build with adaptive charging to ensure safety in extreme environments. For budget-conscious users, the Base Model still offers 2x the capacity of standard 10000mAh power banks.

Frequently asked questions

  • Which ROMOSS power bank model is best for charging laptops on the go?

  • How do I maintain the battery health of my ROMOSS 40000mAh power bank?

  • Why is aluminum better than plastic for a high-capacity power bank like the ROMOSS PMT40?

  • Does the ROMOSS 65W power bank support QC3.0 fast charging for smartphones?

  • Can the ROMOSS 40000mAh power bank charge multiple devices simultaneously?

  • How many times can the ROMOSS 40000mAh power bank fully charge a laptop?

  • Is the 65W output of the ROMOSS power bank safe for sensitive devices?

  • What makes the ROMOSS PMT40’s adaptive fast charge feature unique?

Product comparison

CategoryUsage ScenariosCharacteristicsAdvantagesDisadvantages
High-Capacity Power BanksLong trips, outdoor adventuresIndustry Standard: 10,000mAh (e.g., basic models)
Our Base: 40,000mAh▲▲▲ (ROMOSS PMT40)
Our Advanced: 50,000mAh▲ (upcoming model)		Powers devices 20+ times (smartphones) or 8+ hours (laptops)
Universal compatibility		Bulky design
Higher cost compared to standard models
Fast-Charging Power BanksEmergency charging, frequent travelersIndustry Standard: 18W (standard USB)
Our Base: 65W▲▲ (QC3.0, PD support)
Our Advanced: 100W▲ (supports 100W laptops)		Cuts charging time by 70%
Compatible with smartphones/laptops		Generates more heat at high power levels
Laptop-Compatible Power BanksRemote work, presentations on the goIndustry Standard: ≤18W (insufficient for laptops)
Our Base: 65W▲ (supports 15" laptops)
Our Advanced: 100W▲ (supports 17" laptops)		Powers laptops and peripherals simultaneouslyRequires USB-C or proprietary cables
Compact/Portable Power BanksDaily carry, commutingIndustry Standard: 100x60x20mm (e.g., 10,000mAh)
Our Base: 140x70x25mm▲ (40,000mAh)
Our Advanced: 150x75x30mm▲ (50,000mAh)		Fits in backpacks/bags
Lightweight aluminum build		Less portable than ultra-compact models
Safety-Focused Power BanksRough environments, frequent useIndustry Standard: Basic overcharge protection
Our Base: Overheat/overcharge protection▲ + CE certified
Our Advanced: Military-grade durability▲▲ (IP68 rating)		Safeguards against short circuits/fire risksHigher cost due to advanced safety features
Budget-Friendly Power BanksCasual users, occasional useIndustry Standard: 5,000mAh @ $30
Our Base: 10,000mAh▲ @ $50 (ROMOSS entry-tier)
Our Advanced: 20,000mAh▲ @ $80 (mid-tier)		Affordable entry point
Basic reliability		Limited capacity for multi-device users

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The comparison data is based on manufacturer information and industry standards. Actual results may vary depending on individual use cases. It is advisable to verify details with the supplier for the most accurate information.