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Smart Fortwo 12V Automotive Battery Replacement Guide
How to change a dead 12 volt car battery in the passenger footwell of a 2nd generation 2008-2014 Smart Fortwo city car.

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2013 Smart Fortwo
Remove Floor Mat
Plastic Fastener

This automotive maintenance tutorial was specifically written to assist owners of the second generation (2008, 2009, 2010, 2011, 2012, 2013 and 2014) Smart Fortwo compact city car in changing a dead 12V automotive battery located in the passenger side footwell.

Owners of any Smart Fortwo models or trim levels such as the coupe hatchback, cabriolet or "cabrio", electric, pure, passion, forfour, prime and proxy may also find these DIY instructions to be helpful.

The OEM 12V battery was Smart part number A-000-982-78-08 or A0009827808.

A compatible replacement "Group Size" H5 12 volt battery is  Bosch # H5-650B or the Everstart MAXX-H5 at Walmart.

The tools needed to remove and replace the battery include a flathead screwdriver, a 10mm socket and a 1/4" drive ratchet.

Loosen Counterclockwise
Pull Off Floor Liner
Plastic Fastener Removed
The 12V automotive battery is located in the passenger footwell below the dashboard and glove box.

The first step is to remove the floor mat and set it aside in a safe place.

Then use a flathead screwdriver to rotate the carpet holder plastic fastener in the counterclockwise direction.

Pull off the plastic fastener and set it aside.

Pull Back Floor Carpet
Foam Block
Pull Out Foam Block
Pull back the floor liner carpet.

Remove the large foam block that contains the flat tire sealant kit and air compressor.

Tire Compressor & Sealant
OEM 12V Car Battery
Loosen Negative Terminal
The OEM 12V battery is located under the foam block.

First loosen the negative terminal (located closer to the rear of the car) by turning the nut counterclockwise with the 10mm socket and a 1/4" drive ratchet.

Pull the negative terminal straight off the "-" battery post.

Wrap the terminal with a small towel and tuck it on the side of the battery to help prevent accidental electrical contact.

Pull Off Red Plastic Cover
Loosen Positive Terminal
Pull Off Positive Terminal
Pull the red plastic cover off the positive terminal and set it aside in a safe place.

Loosen the positive terminal by turning the 10mm nut in the counterclockwise direction.

Pull the positive terminal off the "+" battery post.

Battery Clamp - Nut
Loosen Counterclockwise
10mm Nut Removed
Locate the nut and threaded bolt end on the right side of the battery hold down bar or "clamp".

Loosen the nut by turning it counterclockwise with the 10mm socket and a 1/4" drive ratchet.

Set the 10mm nut aside in a safe place.

Lift Battery Hold Down Bar
Pry Out Wire Loom Fastener
Remove Left Side of Bar
Use the flathead screwdriver to gently pry out the black plastic pop rivet that secures the wire loom to the side of the battery hold down bar.

Lift the battery hold down clamp up and remove the hook on the left end from its corresponding slot.


Battery Clamp Removed
Smart OEM Battery
Remove Old Battery
Set the battery hold down bar aside in a safe place.

Pull the small plastic exhaust gas vent tube on the rear edge of the battery out of its port.

Carefully lift the old battery out of the vehicle and gently set it down on the ground.

Try to avoid dropping or tipping over the old battery to prevent from having battery acid leak out.

A compatible replacement Group Size H5 battery is the Bosch # H5-650B.

Lower In New Battery
Push On Positive Terminal
Tighten Clockwise
Gently lower the new battery in to the car with the positive "+" post closer to the front of the car and the negative "-" post closer to the seat and the rear of the vehicle.

Push the positive terminal on to the "+" battery post.

Tighten the 10mm nut in the clockwise direction until it is snug.

Try to avoid over tightening the terminal nut to prevent from damaging the battery post which could lead to an acid leak.

Push On Plastic Cover
Push On Negative Terminal
Tighten Clockwise
Push the red plastic cover back in to place over the positive terminal.

Push the negative terminal on to the "-" battery post.

Tighten the 10mm nut on the negative terminal in the clockwise direction until it is snug.

Re-Insert Metal Hook
Slot For Hook - Left Side
Lower Bar Over Bolt End
Line up the metal hold down bar over the top of the new battery.

Re-attach the metal hook at the left end of the hold down bar in to the slot on the left side of the battery housing.

Lower the hold down clamp over the top of the battery.

Battery Clamp In Place
Spin On 10mm Nut
Exhaust Gas Vent Tube
Spin on the 10mm nut on to the exposed bolt end on the right side of the hold down bar.

Tighten the nut in the clockwise direction until it is snug.

Push the plastic gas exhaust vent tube in to the hole on the rear edge of the battery.

Push In Vent Tube
12V Battery Replaced
Replace Foam Block
Lower the foam block back in to the passenger foot well.
Replace Carpet Liner
Push On Plastic Fastener
Replace Floor Mat
Push the carpet liner back over the foam block.

Push in the plastic fastener to secure the floor liner in place.

Replace the floor mat.

To test the new 12V battery, start the engine and turn on the headlights.

Please be sure to adjust the time on the clock and program your favorite radio station presets before you start driving.

For more, check out all of my 2008-2014 Smart Fortwo DIY Repair & Maintenance Guides.

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