Bosch takes its popular drill/drivers to the next level with BLUECORE Battery Technology. Bosch is so confident that users will get up to 50% longer battery life, that it is offering a two year battery guarantee with ProVantage . BLUECORE Batteries were engineered with internal cooling rods placed between the battery cells to absorb damaging heat. The battery cells stay cooler during operation and charging as compared with standard batteries which heat up quickly, speeding up chemical breakdown and shortening battery life. BLUECORE Batteries can charge in 30 minutes while other batteries take up to 3 hours to charge when hot. And best of all, all BLUECORE Batteries are compatible with current Bosch cordless tools.