Products are certified by CE, FCC & Rohs, tested by manufacturer to match OEM products. No memory effect, can be charged at any time. Intelligent protection against potential damage caused by over-charge, over-discharge, over-voltage, over-current, short-circuit. 6000mAh high capacity, longer running time than others, long-lasting performance to improve your working efficiency and save your time. Always remove the battery pack from your tool when you are assembling parts, making adjustments, cleaning, or when they're not being used for an extended time. br 2. If you don't plan to use the Power Tool Battery for a month or more, store it in a clean, dry, cool place away from heat and metal objects. Ni-Cd, Ni-MH and Li-ion batteries will self-discharge during storage; remember to recharge the batteries before use. br 3. Do not leave the battery dormant for long periods of time.