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Checking your Apple Watch's battery health is easier than you think
At 50 hours of normal use on a single charge and 84 hours in low power mode, the new Apple Watch Ultra 4's battery life is eye-popping, but nothing lasts forever.
Summary
At 50 hours of normal use on a single charge and 84 hours in low power mode, the new Apple Watch Ultra 4's battery life is eye-popping, but nothing lasts forever. Whether it's an iPhone , iPad or Apple Watch, any device's lithium-ion batteries get weaker as they age. This leads to less time between charging sessions, less overall battery capacity and generally worse performance.
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