A battery's self-discharge rate determines how quickly it loses its stored energy when not in use. Batteries with relatively low self-discharge retain their charge for longer periods, making them suitable for applications where infrequent use is common, such as emergency backup systems and remote sensors. Users can rely on these batteries to hold their charge when needed, without constant maintenance.
Batteries with high energy density pack a significant amount of energy into a compact and lightweight package. This means they can store more energy for their size, making them ideal for portable devices and electric vehicles. High energy density batteries provide longer-lasting power, reducing the need for frequent recharging or replacement.