Available from Bosch, the CORE18V battery uses advanced Lithium-ion technology to deliver 80% more power than previous generation Bosch batteries, the company says. In addition, Bosch CORE18V cells are laser-welded and rail-connected for efficiency, allowing the batteries to deliver improved performance at a lighter weight and size, than competitive batteries, Bosch adds.  Bosch CORE18V batteries also provide 100% backwards-compatibility with all 18-volt Bosch Lithium-ion tools and chargers.