Introduction
If your device isn’t charging or loses charge quickly, it may be time to replace the battery. Follow the instructions below to replace the battery in the Lenovo V15-ADA.
Before you begin this repair, make sure your laptop is powered off and unplugged from the charger.
Tools
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            Remove the 10 marked screws using a Phillips #1 screwdriver from the back plate. 
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            M2.5 × 7 mm, Phillips-head (6) (RED circles) 
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            M2.5 × 4 mm, Phillips-head (4) (ORANGE circles) 
 
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            After all 10 screws have been removed, insert a spudger between the bottom plate and the housing and slide across. 
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            Repeat for all 4 sides until loose. 
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            Pop off the back plate and set aside. 
 
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            To start the removal of the battery, disconnect the ribbon cable connecting the battery to the computer. 
 
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            The battery is held in place by 3 screws. Use the Phillips #0 screwdriver to remove the screws that secure the battery. 
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            M2 × 6 mm, Phillips-head, nylok-coated (3) 
 
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To reassemble your device, follow these instructions in reverse order.