Lenovo A7-50 Tablet - Manual (Page 37)

Lenovo A3500
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3. Detach the battery FPC from its connector on the PCBA using a guitar pick.
Figure 2-3. Detaching the battery FPC
4. Detach the battery pack from its seat by inserting a guitar pick into the joint
surface and then cutting along the joint line in the direction shown in the
figure below.
Figure 2-4. Detaching the battery pack