In this article I will share my thoughts on the Bosch Professional GAA 18V-48 Battery USB Adapter which can be used to charge your Google Pixel smartphone, Apple iPad or JBL Charge Bluetooth Speaker on the home-mechanic workbench of your garage. But also you Shimano Di2 battery or your Garmin edge or Wahoo Elemnt cycling computer.
TABLE OF CONTENTS
Key features Bosch Professional GAA 18V-48 Battery Adapter
On the product page of the Bosch Professional GAA 18V-48 Battery Adapter you can read the following description:
The GAA 18V-48 Professional turns Bosch 18V batteries into powerful USB power banks with a charging current of 2x 2.4 A. The compact design of the USB charging adapter makes it easy to carry, and the metal belt clip ensures that the energy reserves are always at hand. The coaxial plug allows Bosch heatable workwear to be powered for warmth during work or during other outdoor activities.The tool is compatible with all batteries in the Bosch Professional 18V System. Also compatible with AMPShare, the multi-brand battery platform.
- Compact USB charging adapter for always having enough power
- Fast USB charging ports with up to 2.4 amps
- Metal belt clip to keep energy reserves at your fingertips
The dimensions of the GAA 18V-48 Battery Adapter are 71 x 98 x 42 mm, which is given by the base of the Bosch 18V batteries. The weight of the battery adapter is 129 grams (on my good old kitchen scales).The locking mechanism on the Bosch 18V battery keeps the adapter in place. On the same side of the battery locking mechanism you see the red on/off switch on the adapter (where a LED signals you that it is turned on).
Remarkable is the metal belt clip with Bosch logo laser etched into the surface (and placed on the top side of the battery adapter). In the movie on the product page you can see how the belt clip will help when keeping your heated vest warm. However the combined weight of GAA 18V-48 and ProCORE 4.0 Ah Battery is 693 grams that you need to put on your belt. This is some extra weight to carry when you need to stay warm.
On the backside of the Bosch Professional GAA 18V-48 Battery Adapter you will see two normal USB ports. According to specification the Battery USB Adapter has a charging current of 2x 2.4 A (at 5V). Between the two USB ports you can see the connector for the Bosch heatable work wear whch has a charging current of 1.2 A at 12V.
Both long sides don’t have much spectacular or functional details. On the one side it is Bosch branding and product type, on the other side you will see the serial number and product details. In summary Bosch Professional GAA 18V-48 Battery USB Adapter is a lightweight accessory for your power tools, that keeps your mobile devices charged or yourself warm when you own heatable workwear.
Concluding thoughts and wrap-up
The price point of the Bosch Professional GAA 18V-48 Battery USB Adapter is around € 30,00 which is very fair for a quality product like Bosch Professional.
It is a great accessory to keep your Google Pixel smartphone, Apple iPad or JBL Charge Bluetooth Speaker charged on the home-mechanic workbench of your garage or helpful when you are working on your bike during a short cycling trip. Or simply when you want to charge your Shimano Di2 battery or Garmin Edge or Wahoo Elemnt cycling computer. Another use-case is on the Lifeline Indoor Trainer Desk to keep Apple iPad and Google Pixel 10 smartphone working (power plus entertainment or TrainingPeaks Virtual)
Other Bosch Professional product review on this website can be found here:
- Convert Bosch Professional GSR 12V-15 into FC FlexiClick version
- Bosch Blauw GLI 12V-300 LED – Professional Light
Interested in other quality reviews on this website? Please click on one of the categories below to read more.

AMPShare is the multi-brand shared battery system that gives you the flexibility to switch between professional tools and brands, without switching batteries. Available in a variety of sizes and power ratings, AMPShare batteries make it simpler to use tools from different brands without having to think. The AMPShare battery technology is based on Bosch Professional’s Professional 18V System: with more than 80 million batteries sold and new brands added every year, this is the battery system you can rely on.



