NinjaBatt Laptop Battery for Sony VGP-BPS21 VGP-BPS13B/Q VGP-BPS13B/B VGP-BPS13 VGP-BPS13B/B VGP-BPS13/S VGP-BPS13B/Q VGP-BPL21 High Performance [6 Cells/4400mAh/49Wh] PREMIUM QUALITY REPLACEMENT NOTEBOOK BATTERY: Bring your laptop back to life with Ninjabatt's high quality laptop battery - Made of high quality materials, top grade battery cells and packed with safety features. TRUE CHARGING CAPACITY THAT LASTS: Every one of our replacement notebook batteries are tested to meet OEM specifications. Our 6 cells Li-ion battery is rated at 49wH/4400mAh/11.1V - true charge capacity that wont let you or your laptop down. SAFETY FIRST: Dont fall into buying cheap and unsafe batteries, our batteries are UL/CE-/FCC-/RoHS certified for safety and packed with a variety of safety features, including short circuit, overheat, and overload protections. HIGH QUALITY COMPONENTS: Our Laptop batteries are assembled from top quality material and circuit boards to ensure durability and performance, our batteries are equipped with grade A battery cells that provide up to 500 charging cycles. 12-MONTH WARRANTY AVAILABLE ON ALL LAPTOP BATTERIES: Were so confident in the performance of our replacement laptop batteries that were including a 12-month warranty with every single purchase. Our batteries contain Grade A NMC cells to ensure longer battery life and durability. Higher quality cells offer over 500 recharge cycles for more use over time. Constructed of high quality materials and circuit board to ensure high performance. Each battery contains built in multi-protection functions such as short circuit, overheat &amp; overload for maximum safety. Our batteries are 100% true to capacity - Don&#039;t fall for fake ads with excessive battery capacity for low prices Ninjabatts are 100% compatible to meet OEM specifications for safety and efficiency. An economical alternative to costly OEM batteries. Built in smart control chip conveniently offers Quicker charging, lower power consumption and longer discharge time. Secured packaging includes anti-static bag wrapped with synthetic foam and a sturdy cardboard box - for safe delivery