The Bosch GAA 18V-48 Professional is a charger or adapter from the battery charger category, designed to power and charge mobile devices or heated clothing via two standard USB-A outputs. It combines the functionality of a portable battery (18 V Bosch Professional), which means it can act as a practical mobile charging station whenever you don't have access to a power outlet. It is intended for users who already have Bosch 18 V Professional batteries and want to use them to charge or power smartphones, tablets or heated clothing in the field, while working or on the go.

The adapter works by connecting directly to an 18-volt Bosch Professional battery (not included), providing a 5 V output via the USB interface with a total current of up to 2.4 A. This means you can charge two devices at the same time at normal charging speed, which is useful when working on a construction site, on longer trips or anywhere where conventional electricity is not available. With this adapter, most modern mobile devices charged via USB-A can easily get additional power.

An important technical feature is that the maximum output current of 2.4 A allows for stable and efficient charging of most phones, tablets or other devices, including powering the Bosch Heated Jacket series, although the final capacity depends on the battery used. Due to its design, which utilizes existing Bosch Professional system batteries, the adapter represents a convenient solution for users of these tools, as it extends the useful life of the battery packs outside the workshop.

The device is designed for rugged use in the field, where portability and power reliability are important. In everyday use, using the charger is simple: insert it into a compatible Bosch 18 V battery and connect any mobile device via USB cable. Combined with the capacity of the existing battery, the adapter allows you to charge smaller electronic devices repeatedly as long as the battery is charged. This is especially beneficial for installers, builders, technicians and anyone who often has no access to electrical outlets while working.

⚖️ Compare features with other products of your choice

It is important to know

Before choosing the Bosch GAA 18V-48 Professional adapter with 2x USB-A outputs, it is crucial to understand its specific role - this product allows you to power mobile devices and heated clothing via Bosch 18V battery packs. The purchase makes sense especially for users who already have a suitable battery, as it is not included. Before purchasing, it is worth considering the method of use and expectations regarding autonomy and flexibility.

• The adapter does not include a battery - the user must have a Bosch 18V battery that is fully compatible with the product.
• Two USB-A outputs with up to 2.4 A provide standard power for smartphones and similar devices, but there is no support for faster USB standards (e.g. Quick Charge or USB-C PD).
• The compact design allows for portability in the field, but practical use is limited by the capacity of the battery used; the duration of charging or powering depends on the capacity (Ah) of the included battery.
• The adapter is also suitable for powering accessories or heated clothing from Bosch, as long as it fits into a USB-A power outlet.

Source of editorial recommendations: general verifiable guidelines for product selection.

In practice

🟢 Charging mobile devices in the field

The adapter easily powers smart devices wherever a Bosch 18V battery is available, without the need for a nearby outlet.

🟡 Independent power supply for heated clothing

It is suitable for Bosch heated clothing or accessories on USB-A, but the total autonomy depends entirely on the capacity of the inserted battery.

🟡 Two devices at the same time

With two USB-A outputs, it can power two devices at the same time, but it will drain the battery faster when powering two more demanding devices.

🔴 Replacement for a stationary USB charger

It is not an optimal solution for regular charging at home; the user still needs a Bosch 18V battery and its charge level affects the charging time of the devices.

Answers to frequently asked questions

Does the adapter work with all Bosch 18V batteries?

The adapter is designed for use with Bosch Professional 18V batteries; compatibility within the same platform is usually guaranteed, but please check specific models beforehand.

Does the adapter support fast charging of smartphones?

No, charging is done with a maximum current of 2.4 A via USB-A; it does not support fast USB standards (e.g. Quick Charge, Power Delivery).

How long can it charge devices?

The duration depends solely on the capacity of the inserted Bosch 18V battery and the consumption of the connected devices.

Does the adapter contain a battery?

Battery not included; you need your own Bosch 18V battery for use.

Description updated: September 2026

Why buy from ENAA?

• The fastest in Slovenia – more than 95% of orders are delivered the next business day.
• The descriptions and content on Enaa are based on professional guides and proven experiences, which provides a credible basis for independent decisions.