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The 2018 GMC Terrain comes with a battery that you can find under the hood of your vehicle. To locate it, go to the front of your vehicle and use the prop arm on the passenger side of the engine compartment to keep the hood open. Look for a big black battery with red and black terminal connections along the front of the engine bay - that's the battery for your Terrain. If you need to replace it, be prepared to spend between $50 and $240 just for the parts.
In the 2018 GMC Terrain, you can find the battery under the car's hood. Search for the big black box with a red and black connection on top.
Setting up a trickle charger, there is a thick red wire attached to the positive terminal.