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.

Can you connect 2 units together for double the charge ?

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

How do you know when it's fully charged ?

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.

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?

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.

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Voltaic Systems V25 6,700mAh USB Always On Battery Backup Power Bank for iPhone, iPad, Samsung Galaxy, Android, and HTC Devices

Voltaic Systems V25 6,700mAh USB Always On Battery Backup Power Bank for iPhone, iPad, Samsung Galaxy, Android, and HTC Devices

Product ID: 388165355

Details

Battery capacity
6400 Milliamp
Brand
Voltaic
Connector type
Usb
Special feature
Auto Shut Off
Voltage
5 Volts

⚡Always-on 5V USB output

🔄Seamless auto-restart on recharge

🔋6,400mAh high-capacity power

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R4225

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Description

🔌 Stay powered, stay unstoppable — the power bank that never sleeps

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

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.

Specifications

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

Reviews

A**!

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.

2.04.2026

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R4225

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

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