BOSCH 1600A00163 Professional GBA18V 4.0Ah Lithium-Ion Battery (Pack of 1), It is not Lithium Solar Battery  (18 V)

The high-endurance 18 Volt XL battery with 4.0 Ah and COOLPACK technology Up to 65% more run time compared to existing 3.0 Ah battery using high quality Li-Ion cells Bosch COOLPACK manages the temperature of the battery cells actively and reduces heat-up which is the main killer for every battery cell 18 V 4.0 Ah batteries have the same weight as existing Bosch 3.0 Ah batteries and are the lightest in the market