Type of battery: Lithium-ion. Voltage: 20V. This battery pack contains 5 pieces of 3.6V 18650-1500mAh Lithium-ion batteries. Only weighs 0.7 lbs Compatible with WORKPRO 20V Pink Drill: Well compatible with WORKPRO 20V Pink Cordless Power Tools such as drill for W004532A Much Safer: Safe guard features against incorrect voltage, battery overload, short circuits, internal overheating. No memory effect, can be charged freely Environmental-friendly: Innocuous to the environment. All 5 pieces of lithium-ion batteries in the battery pack accord with certification requirements of CE/GS/EMC/PAHS/ROHS If you don't plan to use the Pink Drill Battery for a month or more, store it in a clean, dry, cool place away from heat and metal objects and remember to recharge the batteries before using WORKPRO 20V Li-ion Battery Pack for Replacement