V25 USB Battery Pack

The Voltaic Systems V25 USB Battery Pack is a compact and rugged power bank designed for everyday use and outdoor activities. Ideal for travelers, professionals, and hobbyists who need reliable power on the go.

With a 6,700mAh capacity, the V25 provides enough energy to recharge smartphones, cameras, sensors, and other USB devices multiple times. Its lightweight and durable aluminum housing makes it resistant to heavy use, while the slim design easily fits into a bag or backpack.

The V25 features two USB-A outputs, a USB-C Power Delivery port, and a 3.5 x 1.1 mm solar input. Its unique Always On function ensures that low-power devices such as sensors and trackers remain powered without the battery shutting off. This makes the V25 especially suitable for long-term use in both urban and remote environments.

Features

• Compact and lightweight design
• Durable aluminum housing
• Always On function for low-power devices
• Supports charging via solar panel and USB
• Multiple ports: 2x USB-A, USB-C PD, solar input

Specifications

• Capacity: 6,700mAh, 24Wh
• Output: 2x USB-A 5V/2A, max 3A total (Always On)
• USB-C PD In/Out (top): 5V/4A, 9V/2.2A, 12V/1.6A(NOT Always On Compatible!)
• USB-C solar input: 5-6V/2A
• 3.5 x 1.1 mm solar input: 5-6V/2A
• Minimum charge current: 5mA (indicators turn on at 60mA)
• Maximum Power Point (MPP): 5.2V
• Battery type: Li-Ion
• Protection: short circuit, over charge, over discharge, high/low temperature (45℃ input cutoff, 60℃ output cutoff, 0℃ input cutoff, -15℃ output cutoff)
• Safe for air travel (carry-on luggage only)
• Dimensions: 8x8.2x2.4cm
• Weight: 23 grams
• Housing: Aluminum
• Compatible with Voltaic solar panels

Always On functionality

The V25’s Always On technology ensures the USB-A outputs stay active even when devices draw little or no current. This prevents low-power devices such as dataloggers or sensors from shutting off due to an automatic cutoff, greatly improving reliability in long-term applications.

Charging can be stopped by double tapping the Power Level button or disconnecting your device. To resume, simply tap the button once. After a discharge or temperature event, the battery automatically recovers into Always On mode. This feature is not active when charging via the USB-C PD input on the top of the battery, but remains active through the side input or when no input is connected.