The Bosch GXS18V-01N14 starter kit with (1) CORE18V battery (and fast charger) gets users started with unleashed power and productivity. The BC1880 18V fast charger recharges the battery in less than an hour. The Bosch CORE18V employs next-gen li-ion technology, producing 80% more power than previous-generation cells. CORE18V's performance is comparable to competitor batteries that are up to 35% larger. Cool pack 2.0 technology provides up to 135% more battery life than batteries that don't have Cool pack. The included BC1880 18V fast charger can charge a spent CORE18V to 80% in 41 minutes and to 100% in 55 minutes. The charger has a dual-mode charge â the first 80% is very fast, while the remaining 20% is in regular mode.