Bosch 4.0 Ah Batteries
Bosch 4.0 Ah Batteries

Dec 14, 2012– Stuttgart, Germany  (Techreleased) – The new 4.0 Ah batteries from Bosch Cordless tools need to be compact and powerful for professional tradespeople to be able to work efficiently. What matters is a long runtime and lifetime of the batteries. Bosch is now meeting and exceeding these requirements by launching 4.0 Ah batteries for 14.4 and 18 volt lithium-ion professional tools.

Jan Breitenbach, who worked on the battery technology for Bosch professional tools as a project leader, knows that the increase in battery capacity offers advantages to professional tradespeople: “Tests by SLG Prüf- und Zertifizierungs GmbH, an independent testing and certification company, prove that the runtime of our GSR 18 V-LI cordless drill/driver is increased by 65 percent when using a 4.0 Ah battery compared to a 3.0 Ah battery.” The basis for this is a higher energy density in the battery packs and an improved internal resistance. This also has a positive effect on the performance capability of the batteries at low temperatures. “Our 4.0 Ah lithium-ion batteries are now clearly superior to both nickel cadmium and nickel metal hydride batteries in this respect”, emphasizes the battery specialist.

Cooling technology prevents forced breaks caused by overheating
The longer the runtime, the more important it becomes to prevent the batteries from heating up too much, too quickly, therefore protecting them against premature aging and damage. Breitenbach: “Lithium-ion batteries must not be operated at a temperature over 70 degrees Celsius. Many competitors use a system of electronic cell monitoring to shut down the battery or machine in the event of overheating.” This means that the user is forced to take a break and loses valuable work time. This is why Bosch has gone about it another way: “Since 2006 we have been using the Bosch CoolPack technology in lithium-ion batteries and have also equipped the new 4.0 Ah batteries with it”, says Breitenbach.

Bosch CoolPack batteries have a special housing geometry: the lithium-ion cells are pressed precisely into a red heatsink and thermally bound to it. “It is made of HDPE, a very high density polyethylene. This material is very good at conducting heat, while being electrically insulating and increasing the safety of the battery”, explains Breitenbach. The cooling fins fitted on the bottom offer an enlarged surface for heat exchange and dissipation of the heat outwards, similar to the effect in a refrigerator. As a result, Cool-Pack batteries have a considerably longer life: “Our measurements have shown that the lifetime of these batteries is double that of those without CoolPack technology”, says Breitenbach. Although the batteries are very robust and compact due to their special design, they are the lightest batteries on the market.

The proven “Flexible Power System” is also being used for the 4.0 Ah batteries with CoolPack technology: they are freely interchangeable between 14.4 or 18 volt tools within the same voltage class.

The new 4.0 Ah lithium-ion batteries with CoolPack technology will be available from January 2013 onwards for 14.4 and 18 volt professional tools. The prices are 110 and 135 euros (14.4 and 18 volt) plus VAT. Compact batteries with 2.0 Ah and CoolPack technology will also be available from May 2013 onwards.

The Power Tools Division of the Bosch Group is the world market leader for power tools and power tool accessories. In 2011, its workforce generated sales of some 3.8 billion euros, 90 percent of which outside of Germany. With brands such as Bosch, Skil and Dremel, the division stands for customer focus and great engineering progress. The core success factors are innovative strength and pace of innovation. Each year, Bosch Power Tools launches more than 100 new products onto the market. The division generated about 40 percent of its sales in 2011 with products that have been on the market for less than two years. The business segments electric power tools, accessories, measuring tools and electric garden tools of Bosch Power Tools outperformed the market.

The Bosch Group is a leading global supplier of technology and services. In the areas of automotive and industrial technology, consumer goods, and building technology, more than 300,000 associates generated sales of 51.5 billion euros in fiscal 2011. The Bosch Group comprises Robert Bosch GmbH and its roughly 350 subsidiaries and regional companies in some 60 countries. If its sales and service partners are included, then Bosch is represented in roughly 150 countries. This worldwide development, manufacturing, and sales network is the foundation for further growth. Bosch spent some 4.2 billion euros for research and development in 2011, and applied for over 4,100 patents worldwide. With all its products and services, Bosch enhances the quality of life by providing solutions which are both innovative and beneficial.