Whenever you use the spudger near the battery, be very careful not to puncture the battery.

Using the pointed end of a spudger, pry the battery connector straight up from the motherboard to disconnect the battery.

To re-attach press connectors like this one, carefully align and press down on one side until it clicks into place, then repeat on the other side. Do not press down on the middle. If the connector is misaligned, the pins can bend, causing permanent damage.