1. Our brand new replacement Dell Inspiron 1525 batteries are made with high quality cells ( SANYO, BAK, Janpan etc.), lasting as long as the original battery did.This replacement dell laptop battery is guaranteed to be brand new and fresh from the factory. 2. Every piece of Dell Inspiron 1525 laptop battery has been tested on Dell systems to ensure the safety for your Dell laptop. Our batteries has passed the CE, UL, ROHS, and ISO9001 certifications. It can full charge/discharge at least 300-500 times. 3. This high quality rechargeable battery for Inspiron 1525 laptop is designed with the highest control standards; have internal circuit boards with smart chips ( Cell imbalance shut off protection, Thermal runaway protection, Overcharge shut off protection, Over discharge shut off protection, High/low temperature shut off protection ), and are made from eco-friendly materials without lead or mercury.