Throughout the following procedure, you'll be sliding thin plastic cards between the battery and rear case of the iPad, to separate the adhesive securing the battery. Be careful to keep the cards as flat as possible to avoid bending the battery, which may damage it and cause it to release dangerous chemicals.

Once the adhesive has had a couple minutes to soften, flip the iPad over, battery-side up.

Insert a plastic card underneath the battery contacts.

There is a metal standoff under the battery contact. You will need to lift the contact up slightly to clear this standoff and insert the plastic card.

Push the card about an inch under the battery to begin breaking up the adhesive holding it in place.