If a system has an internal battery, what should be done before servicing it?

Before servicing a system with an internal battery, it is essential to disconnect the internal battery from the system board to ensure safety and prevent any potential damage. Disconnecting the battery eliminates the risk of electrical shock and protects sensitive components from accidental power surges that may occur during maintenance. This precaution is especially important when working on the internal connections and circuitry of the device, as residual power could lead to unintended operations or data loss.

Other choices may not prioritize safety. Leaving the battery connected poses a risk since any inadvertent contact with the internal components could create shorts or compromise the integrity of the system. Checking the battery's charge might provide information about its status, but it doesn't eliminate the risk associated with servicing the system while the battery is still connected. Using a power supply tester is helpful for diagnosing power issues but is not a prerequisite before servicing; it does not address the safety concerns of having a live battery in the system while working on it. Therefore, properly disconnecting the internal battery is the best practice to ensure a safe service environment.