--- product_id: 388165355 title: "Voltaic Systems V25 6,700mAh USB Always On Battery Backup Power Bank for iPhone, iPad, Samsung Galaxy, Android, and HTC Devices" brand: "voltaic systems" price: "¥37451" currency: JPY in_stock: true reviews_count: 1 category: "Voltaic Systems" url: https://www.desertcart.jp/products/388165355-voltaic-systems-v25-6-700mah-usb-always-on-battery-backup store_origin: JP region: Japan --- # Always-on 5V USB output Seamless auto-restart on recharge 6,400mAh high-capacity power Voltaic Systems V25 6,700mAh USB Always On Battery Backup Power Bank for iPhone, iPad, Samsung Galaxy, Android, and HTC Devices **Brand:** voltaic systems **Price:** ¥37451 **Availability:** ✅ In Stock ## Summary > 🔌 Stay powered, stay unstoppable — the power bank that never sleeps ## Quick Answers - **What is this?** Voltaic Systems V25 6,700mAh USB Always On Battery Backup Power Bank for iPhone, iPad, Samsung Galaxy, Android, and HTC Devices by voltaic systems - **How much does it cost?** ¥37451 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/388165355-voltaic-systems-v25-6-700mah-usb-always-on-battery-backup) ## Best For - voltaic systems enthusiasts ## Why This Product - Trusted voltaic systems brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Compact powerhouse:** Mini form factor (9.14 x 8.38 x 3.05 cm) fits effortlessly in your daily carry - • **Smart auto-restart:** Automatically resumes charging after depletion—no button pressing needed - • **Power that never quits:** Reliable 6,400mAh capacity keeps your devices charged all day - • **Uninterrupted USB power:** Always-on output ensures your gadgets stay powered even while recharging - • **UPS for your USB devices:** Protects sensitive electronics from power interruptions and resets ## Overview The Voltaic Systems V25 is a premium 6,400mAh USB power bank designed for professionals who demand continuous, reliable power. Unlike typical power banks, it delivers a constant 5V output without auto shut-off, automatically restarts charging after depletion, and functions as a mini uninterruptible power supply (UPS) for USB devices. Its compact size and smart features make it ideal for powering smartphones, tablets, microcontrollers, and sensitive electronics without interruption. ## Description Shop Voltaic Systems V25 6,700mAh USB Always On Battery Backup Power Bank for iPhone, iPad, Samsung Galaxy, Android, and HTC Devices. Free delivery and returns on eligible orders. Review: First one was faulty. Second one good - No idea whether they have quality control. First one was clearly faulty (no power from the right hand USB port). So easy to test before it leaves production for something twice the price of a normal USB power bank. But - the second one is fine and quite good. A shame it doesn’t have a small display for power level - just four little lights. ## Features - Auto Shut Off ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07ZS3WYZY | | Amperage | 2 Amps | | Battery Capacity | 6400 Milliamp Hours | | Battery capacity | 6400 Milliamp Hours | | Best Sellers Rank | 908 in Mobile Phone Portable Power Banks | | Brand | Voltaic Systems | | Brand Name | Voltaic Systems | | Compatible Devices | Smartphone, Tablet | | Compatible Phone Models | Htc,Iphone | | Connector Type | Usb | | Connector type | Usb | | Country of Origin | China | | Customer Reviews | 4.4 out of 5 stars 2 Reviews | | Item Dimensions | 8 x 8.2 x 2.4 centimetres | | Manufacturer | FENRIR | | Manufacturer Part Number | V25 | | Model Number | V25 | | Number of Batteries | 1 Nonstandard Battery batteries required. | | Number of Ports | 5 | | Other Special Features of the Product | Auto Shut Off | | Output Current | 1 Amps | | Power Source | Corded Electric | | Power source | Corded Electric | | Reusability | Rechargeable | | Special feature | Auto Shut Off | | Unit Count | 1.0 count | | Voltage | 5 Volts | ## Product Details - **Battery capacity:** 6400 Milliamp Hours - **Brand:** Voltaic Systems - **Connector type:** Usb - **Special feature:** Auto Shut Off - **Voltage:** 5 Volts ## Images ![Voltaic Systems V25 6,700mAh USB Always On Battery Backup Power Bank for iPhone, iPad, Samsung Galaxy, Android, and HTC Devices - Image 1](https://m.media-amazon.com/images/I/71IqAg4knhL.jpg) ![Voltaic Systems V25 6,700mAh USB Always On Battery Backup Power Bank for iPhone, iPad, Samsung Galaxy, Android, and HTC Devices - Image 2](https://m.media-amazon.com/images/I/61Myn4YoRUL.jpg) ![Voltaic Systems V25 6,700mAh USB Always On Battery Backup Power Bank for iPhone, iPad, Samsung Galaxy, Android, and HTC Devices - Image 3](https://m.media-amazon.com/images/I/61WwpOy54NL.jpg) ![Voltaic Systems V25 6,700mAh USB Always On Battery Backup Power Bank for iPhone, iPad, Samsung Galaxy, Android, and HTC Devices - Image 4](https://m.media-amazon.com/images/I/514vy5FZUIL.jpg) ![Voltaic Systems V25 6,700mAh USB Always On Battery Backup Power Bank for iPhone, iPad, Samsung Galaxy, Android, and HTC Devices - Image 5](https://m.media-amazon.com/images/I/71VuKvAM8CL.jpg) ## Questions & Answers **Q: where is this made?** A: Both of mine were made in China, mine are the smaller ones that I use to power a camera that won't draw enough current to keep other batteries from shutting down. **Q: Can you connect 2 units together for double the charge ?** A: Hello - if you mean double the capacity, we would suggest using the V50 - https://www.amazon.com/Voltaic-Systems-Always-External-Battery/dp/B00XZ7YU4M/ If you mean double the current (4A), it is possible with something like this "splitter" cable - https://www.amazon.com/HIGHROCK-Enhancer-Female-Charge-Extension/dp/B00NIGO4NM/r **Q: How do you know when it's fully charged ?** A: If connected to a power source like USB or a 5 or 6 Volt solar panel, the lights will blink when charging. When fully charged, all 4 LEDs will turn solid. **Q: Can I plug in into a wall outlet & keep drawing power from it always? I do not have any solar need. Any other product recommendation for my purposes?** A: Yes, the V25 has "pass through charging." It can accept a full charge and discharge at the full rate at the same time. If your power shuts off, there is no lag in power to your device. Customers do use it as a UPS. ## Customer Reviews ### ⭐⭐⭐⭐ First one was faulty. Second one good *by A***! on 2 April 2026* No idea whether they have quality control. First one was clearly faulty (no power from the right hand USB port). So easy to test before it leaves production for something twice the price of a normal USB power bank. But - the second one is fine and quite good. A shame it doesn’t have a small display for power level - just four little lights. ## Frequently Bought Together - Voltaic Systems V25 6,400mAh USB Always On Battery Backup Power Bank for iPhone, iPad, Samsung Galaxy, Android, and HTC Devices (Gray) - Dusproof Waterproof IP 68 Lighting Breather Screw Air Vent Pressure Reduce Valve M12x1.5 Venting Screw Breather Plug - 2Pack - QILIPSU 3/4 NPT Nylon Cable Gland, Waterproof IP68 Adjustable Locknut for 13-18mm Cable Diameter (3/4 NPT, 6pcs) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/388165355-voltaic-systems-v25-6-700mah-usb-always-on-battery-backup](https://www.desertcart.jp/products/388165355-voltaic-systems-v25-6-700mah-usb-always-on-battery-backup) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-05-14*