Lenovo K5 & K9 Note (BL287) Li-ion Replacement Battery The BL287 Li-ion replacement battery is designed to restore dependable, long-lasting power to your Lenovo K5 Note and K9 Note, delivering stable daily performance with safe, reliable charging. Specifications Model: BL287 Battery Type: Lithium-ion (Li-ion) Capacity: 3540mAh (Rated) / 3760mAh (Typical) Nominal Voltage: 3.8V Compatible Device: Lenovo K5 Note, Lenovo K9 Note