AC Doctor INC 5200mAh 6-Cell Black Laptop Battery Replacement for Acer BATBL50L6 3100 3690 5610 New All products are CE-/FCC-/RoHS-Certified by reputable, qualified and accredited testing laboratories. Strict guidelines for compatibility Built-in circuit protection. Automatic power cut off at high electric current, voltage or temperature ensures safety and extended battery life. Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. Operation time: 1.5 - 3 hours. Actual operation time varies depending on types of the device and the way it is used. 12-months hassle-free warranty service. Please check if this battery is compatible with your computer before purchasing. Part numbers of compatible batteries and Computers are listed as following.