Type: These are lithium-ion (Li-ion) batteries, which are commonly used in laptops due to their high energy density and long lifespan.
Voltage: Most of the batteries have a voltage of 11.1V.
Capacity: The capacity is typically 5200mAh, but some may have 6200mAh. Capacity determines how long the battery can power the laptop on a single charge.
Compatibility: Many of the batteries are replacements for Lenovo T540P and T640P models.