Nickel-Cadmium (NiCad) batteries are rechargeable batteries commonly used in solar power systems. They have a high energy density, long service life, and a wide operating temperature range, making them a reliable and durable choice for off-grid and backup power applications. NiCad batteries are maintenance-free and do not require regular topping up of water, unlike lead-acid batteries. They also have a low self-discharge rate, meaning that they can retain a charge for a long time. However, NiCad batteries are more expensive than lead-acid batteries and have a higher environmental impact due to the presence of toxic heavy metals. Despite these drawbacks, NiCad batteries remain a popular choice for off-grid and backup power applications due to their reliability and durability.

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