1 Charging Dell inspiron 1440 over 12-hour continuous more than three times after purchasing the Dell inspiron 1440 battery for your laptop, to prevent "memory effect". 2 Please check your original Dell inspiron 1440 Battery's OEM part Numbers or laptop model Numbers with our postings and picture before the purchase to make sure you get the correct battery. 3 When you prepare to charge for your Laptop Battery, make sure the temperature is around the room temperature.