Lithium-Ion (Li-ion) batteries are another common rechargeable battery chemistry used in robotics. Like LiPo Batteries, they offer high energy density and low mass, making them well suited for mobile robotic systems.

Li-ion batteries generally have higher energy density than LiPo batteries, meaning they can store more energy per unit mass. This makes them advantageous for applications where long runtime is prioritized over peak power output. However, Li-ion cells are typically more limited in discharge rate, meaning they cannot safely supply extremely high currents without voltage sag or overheating. To achieve higher current capability, multiple cells must be connected in parallel.