What you need
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Use your fingernail or a spudger to peel up the left-side button cable and flip it over the side of your phone.
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Use your fingers or an opening pick to peel up a corner of the battery pull tab labeled "2".
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Grab the tab with your fingers and peel it off the top of the battery.
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Peel the pull tab labeled "1" completely off the top of the battery.
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With both hands, firmly grab the pull tab labeled "2" as close to the left edge as possible. Brace your hands against the rest of the phone frame.
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Pull up with firm, steady force until the battery separates.
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If you can't loosen the battery, follow the next step for an alternate method.
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Apply two or three drops of high-concentration (>90%) isopropyl alcohol to the left edge of the battery.
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Tilt the left edge of the phone up to help the alcohol flow under the battery.
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Wait one minute to allow the alcohol to soften the adhesive.
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Use the flat edge of an opening pick to pry up the left edge of the battery until it separates.
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Peel and remove the battery and its plastic liner from the phone.
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To reassemble your device, follow these instructions in reverse order.