Voltaic V25 6,700mAh USB Always On Battery Backup - Solar Ready

In this review the Voltaic V25 is presented as a compact, solar-optimized USB battery pack aimed at users who need reliable backup power and continuous operation for sensors, cameras, and mobile devices. The single biggest reason to buy is its Always On feature combined with solar-optimized cells that make it well suited for outdoor or off-grid setups where uninterrupted power is required. It also offers pass-through charging so devices can remain powered while the pack charges from USB-C or a solar panel.

Key Features

• SOLAR OPTIMIZED: High temperature Li-ion cells are tested and optimized for solar charging so the pack tolerates variable input and outdoor use better than standard batteries.
• CAPACITY: The 6,700mAh (24 Wh) capacity provides roughly one and a half charges to most smartphones and partial charges to tablets, making it useful for day trips and light field work.
• POWER OUTPUT / INPUT: Multiple ports including USB-A 5V/2A (3A max across two ports) and USB-C 20W PD input/output give flexible charging and faster recharge from a USB-C PD source.
• ALWAYS ON MODE: The upgraded Always On mode allows the unit to act as a simple UPS for cameras and sensors, delivering continuous power without timing out when used with low-draw devices.
• PASS THROUGH CHARGING: The V25 supports pass-through so you can charge the battery and power connected gear simultaneously, convenient for temporary installations and travel.

Who It's For

The V25 is a strong fit for photographers, outdoor enthusiasts, and hobbyists powering action cameras, small cameras, or environmental sensors where continuous power and solar compatibility matter. Its compact size and USB-C PD input/output also make it handy for travelers who want a dependable backup for phones and small tablets.

Those who regularly need multi-day power for large tablets or laptops should look elsewhere for higher capacity solutions, and users who expect many full tablet charges per outing will want a larger bank. For simple phone backup, occasional use, or solar-powered field setups the V25 is a practical choice.

Pros & Cons

Pros

• Solar-optimized cells and a solar input option make it suitable for off-grid charging with compatible panels.
• Compact 6,700mAh capacity that balances size and usable backup for smartphones and small tablets.
• Always On and pass-through charging provide reliable continuous power for cameras and sensors.
• USB-C 20W PD input/output adds faster recharge and flexible device charging options.

Cons

• Battery capacity is moderate, so it only delivers about 1.5 smartphone charges and limited tablet runtime compared with larger power banks.
• Customers noted mixed impressions about overall battery life in heavy-use scenarios.

Specifications

Our Verdict

The Voltaic V25 is a practical, solar-ready 6,700mAh power bank that earns its place for anyone needing continuous, reliable USB power in the field. It is especially good value for camera operators and sensor projects that benefit from the Always On feature and solar optimization, though those needing sustained multi-day tablet or laptop power should consider higher-capacity alternatives.

Frequently Asked Questions

Can the V25 be charged with a solar panel?
Yes, it accepts a 5-7V 2A solar input and is optimized for solar charging when used with compatible Voltaic panels.

Does it support pass-through charging?
Yes, the V25 supports pass-through charging so devices can be powered while the pack itself is charging.

Will it keep a camera or sensor running continuously?
Yes, the upgraded Always On mode is designed to allow continuous operation for low-draw devices like cameras and sensors without timing out.