Notebook Battery for IBM ThinkPad T400s 2809 11.1 Volt Li-ion Laptop Battery (Ultrabay Secondary Battery)

Dr. Battery Advanced Pro Series

Advanced Pro Series is powered by the first and only rechargeable lithium-ion cell that overcomes the barrier of temperature. Leyden Energy’s cutting-edge patented cell technology give the Advanced Pro Series the ability to tolerate temperature ranging from -20°C / -4°F to 60°C / 140°F which is unmatched in the industry. It offers 800+ recharge cycles and 2 years warranty with sustainable performance. These batteries are offered to many major brand name laptop models.

Dr. Battery Green Series

The 3 years warranty Green Series is powered by Boston-Power’s patented Sonata Cells, designed and built with the idea “Green the Earth” as priority. Green Series is capable to retain at least 80% of its original capacity after 1000+ recharge cycles, while other batteries can only recharge under 400 times also suffers from significant capacity decline. Green Series provides at least 3 times longer battery lifespan than conventional batteries where the benefit is two-fold: less expensive over the long run and less electronic waste.