A technician is preparing to replace the battery in a customer's smartphone. Which battery chemistry is used in nearly all modern smartphones and tablets because it provides a high energy density while remaining relatively lightweight?
Lithium-ion
Lead-acid
Nickel-metal hydride
Nickel-cadmium
Lithium-ion batteries deliver a high energy-to-weight ratio, making them ideal for portable devices such as smartphones and tablets that require long runtimes without adding excessive mass. Other chemistries-such as nickel-cadmium, nickel-metal hydride, or lead-acid-either suffer from lower energy density, higher weight, or form factors unsuitable for modern mobile devices, which is why they are rarely used in today's handheld electronics.
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