Batteries Increasing Internal Resistance

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Gman's picture
Joined: 11/21/2006
Points: 1720

Batteries Increasing Internal Resistance

To a large extent, the internal resistance, also known as impedance, determines the performance and runtime of a battery. If measured with an AC signal, the internal resistance of a battery is also referred to as impedance. High internal resistance curtails the flow of energy from the battery to the equipment.

A battery with simulated low and high internal resistance is illustrated below. While a battery with low internal resistance can deliver high current on demand, a battery with high resistance collapses with heavy current. Although the battery may hold sufficient capacity, the voltage drops to the cut-off line and the ‘low battery’ indicator is triggered. The equipment stops functioning and the remaining energy is undelivered.

Figure 6-2: Effects of impedance on battery load.
A battery with low impedance provides unrestricted current flow and delivers all available energy. A battery with high impedance cannot deliver high-energy bursts due to a restricted path, and equipment may cut off prematurely.

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