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Honda Accord 12V Automotive Battery Replacement Guide
How to change a dead 12 volt car battery in the engine bay of an 8th generation 2008-2012 Honda Accord sedan with photos.

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2009 Accord 12V Battery
Loosen Negative Terminal Nut
Pull Off "-" Negative Terminal
This automotive maintenance tutorial was specifically written to assist owners of the eighth generation (2008, 2009, 2010, 2011 and 2012) Honda Accord sedan or coupe in changing a dead 12 volt car battery in the engine bay.

Owners of other Honda or Acura vehicles with similar door panels such as the Civic, CR-V, Fit, CR-Z, Insight, Crosstour, Odyssey, Pilot, Ridgeline, RLX, TL, TSX, ILX, ZDX, MDX and RDX may also find these DIY instructions to be helpful.

The OEM battery in this 2009 Honda Accord LX Premium sedan was a "Group Size" 51R.

A few compatible replacement batteries with their part numbers are as follows: Optima 8040-218 D35, Exide FP-AGM24F, EverStart Maxx 51R (Walmart), AutoCraft Gold 51R-1 or 51R-2, Optima YellowTop D51R, ProStart 51R500PS, Bosch 51R450B, Bosch Platinum AGM # 51R440BAGM, and the Optima 8020-164 35 RedTop .

The tools required to replace the automotive battery include a deep well 10mm socket with a 1/4" drive ratchet or a standard 10mm wrench.

Cover & Tuck Away
Loosen Positive Terminal Nut
Pull Off Positive Terminal
The first step is to loosen the negative terminal nut by turning it counterclockwise with the 10mm socket and 1/4" drive ratcheting wrench.

Pull the negative terminal off the "-" battery post, wrap in a small towel to help prevent accidental contact and then tuck it away on the side of the battery.

Next loosen the nut on the positive "+" terminal by turning it in the counterclockwise direction.

On this 2009 Accord, the positive terminal had been previously replaced so it had a 12mm terminal nut. But your vehicle should have a 10mm terminal nut.

Pull the positive terminal straight off the "+" battery post, cover it with a rag and tuck it away on the side of the battery.

Deep Well 10mm Socket
Loosen Battery Clamp Bar
Unhook "J" Bars
Loosen the two nuts on the battery hold-down bar or "clamp" by turning them counterclockwise with a deep well 10mm socket.

You don't need to completely remove the nuts. They just need to loosened enough to where you can unhook the two "J" bars from their sockets.

Lift the metal clamp and two "J" bars straight off the old battery while avoiding touching the battery posts.

Set the battery clamp aside in a safe place.

Old Battery Released
Old Battery Removed
Clean Off Battery Tray
Carefully pull the old battery out of the engine bay.

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

Clean off any debris from the battery tray so that the new battery will rest evenly.


Check Terminal For Corrosion
Check Cables For Corrosion
Purchased New Terminals
Check both the positive and negative terminals for corrosion, rust or damage.

I purchased new terminals at Advance Auto Parts when I got the battery just in case the terminals needed to be replaced.

If you've had an issue with corrosion (white or blue powder) building up on the terminals or the battery posts, consider installing some felt anti-corrosion washers over the battery posts.

Testing Battery & Terminals
Bracket For "J" Bar Hook
Lower Battery Hold Down Bar
Carefully lower the new Group Size 51R battery in to the engine bay with the "+" positive post on the left (passenger side) and the "-" negative post on the right (driver side).

I temporarily hooked up the two terminals to test the new battery and see if the old terminals needed to be replaced due to excessive corrosion.

The engine started immediately, so I skipped replacing the slightly corroded positive terminal.

Tighten Positive Terminal
Push On Negative Terminal
Tighten 10mm Clockwise
First push the positive terminal on to the "+" battery post on the left (passenger side) of the battery.

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

Avoid over tightening the terminal nut to prevent from damaging the battery post which may lead to an acid leak.

Then push on the negative terminal on to the "-" battery post.

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

Honda-Accord-12V-Automotive-Battery-Replacement-Guide-022 Honda-Accord-12V-Automotive-Battery-Replacement-Guide-023
Insert Hook In Bracket
Attach Other "J" Hook
Carefully lower the battery hold-down bar and "J" hooks over the new battery while avoiding touching the "+" and "-" posts.

Re-insert the hooks at the end of the "J" bars in to their brackets.

Tighten 10mm Nuts
Tighten Clockwise
New Battery Installed
Tighten the two nuts on the battery hold down bar by turning them clockwise with the deep well 10mm socket and a 1/4" drive ratchet.

Double check that the new battery is secure and can not be slid around the tray or rocked back and forth. If the new battery can be be moved, tighten the two nuts on the hold-down bar a few more turns.

Test the new 12V battery by starting the engine and turning on the headlights.

Be sure to adjust the time on the clock and set your favorite radio station presets before driving.

For more, check out my other 2008-2012 Honda Accord Repair & Maintenance Guides.

If you found this guide to be helpful, please consider making a small donation by clicking on the "Donate" button located to the right of this paragraph. Thank you!
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