High-Capacity Replacement Battery for Lenovo Slim 7 ProX and Yoga Slim 7 ProX Series Restore your Lenovo Slim 7 ProX or Yoga Slim 7 ProX to optimal performance with this premium 70Wh Li-ion replacement battery. Specifically engineered for Lenovo's premium ultrabook series, this L21M4PC7 compatible battery delivers extended runtime for creative work and productivity with stable 15.52V output and high-capacity 4511mAh in a sophisticated 4-cell design. Perfect for professionals and creators requiring maximum performance from their premium ultrabooks.