What is the difference between NiCad and Li-Ion batteries?

The Welch Allyn Nickel-Cadmium handle is the baseline model that will serve as a cheaper but reliable power source.  One of the biggest benefits is that it can be converted to use disposable batteries. However, NiCad batteries will remember the point at which you charge them as “empty,” therefore overtime it will not charge to its full capacity.

The Lithium Ion Power Handle's Lithium Ion technology provides twice the battery life (120 minutes on time) with just half the weight. This "smarter" technology also means no memory effect, often found in Nickel Cadmium batteries. The Power Handle also includes a low-battery indicator.