GarageDex

2005 Mercury Mariner Battery Size

The 2005 Mercury Mariner uses a BCI Group 40R battery (Group 96R also fits), rated about 500-590 cold cranking amps (Flooded).

BCI Group Size40Ralso fits Group 96RThe case-size code that sets the physical fit and terminal layout.Verified fit
Battery type (OEM)
Flooded
Cold cranking amps (CCA)
500-590
Terminal position
Reversed-terminal layout (R)
Dimensions (L×W×H)
175×175×190 mm
Location
Under the hood (engine bay)

Escape twin; gas 40R (Hybrid uses 96R 12V aux). Always confirm against your owner's manual or current battery label.

Verified fitLast checked
Sources: CarSpecs
It comes with a standard flooded battery. You can usually step up to an AGM in the same Group 40R for longer life, but it isn't required. A 500-590 CCA rating is typical for this class. Matching or slightly exceeding the OEM figure is fine; going below it risks hard starts in winter. Group 40R defines the case size and terminal layout (reversed-terminal layout (r)), so any reputable Group 40R battery will fit the tray and connect correctly. Some trims or engines use Group 96R instead, so always confirm against the label on your current battery.

Where to buy a Group 40R battery

A car battery is heavy and expensive to ship, so buying in person (Walmart, Costco, or a local auto-parts store) often beats online once you count free installation and the core-charge refund on your old battery. To compare prices and reviews online:

Search Group 40R batteries on Amazon500+ CCA, Flooded

As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.

Frequently asked

What size battery does a 2005 Mercury Mariner take?

The 2005 Mercury Mariner uses a BCI Group 40R battery (Group 96R also fits), rated around 500-590 cold cranking amps.

Does the 2005 Mercury Mariner need an AGM battery?

No - it comes with a flooded battery from the factory. You can usually upgrade to AGM in the same Group 40R size, but it isn't required.

How many cold cranking amps (CCA) does it need?

Aim for roughly 500-590 CCA. Choosing at or above the OEM rating is fine; going below can cause hard starts in cold weather.

Where is the battery located?

Under the hood (engine bay). Reversed-terminal layout (R).

Other vehicles that use Group 40R

See all cars that take a Group 40R battery →
2010 Ford Escape2009 Ford Escape2008 Ford Escape2007 Ford Escape

Also check the wiper sizes for your 2005 Mercury Mariner →