Need a battery for the Fujitsu Lifebook E-6550 notebook? BTI has you covered with our premium 6 cell LiIon 4400 mAh, battery. Manufactured by BTI and built to our highest quality standards, this battery meets or exceeds the original manufacturer"s specifications. At BTI build quality is an obsession and this allows us to offer an industry leading 18 month manufacturer"s warranty. BTI...Better Technology Inside