Answer / Mohd Danish Farooqui

Residual magnetism refers to the magnetic field that remains in a material after it has been subjected to a strong magnetic force, then removed. In the context of an emergency lighting system, lead-acid batteries are often used due to their reliability and low cost. To order batteries for a 24V system, you would need to find a supplier who offers 24V batteries. Lead-acid batteries typically have multiple cells connected in series to achieve the desired voltage. For example, six 2V lead-acid cells would be required to make a 12V battery, and four of those batteries could be used to create a 24V system.

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