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VW B5 Passat TDIs This is a general discussion about B5 Passat(>98 (2004-2005 in North America)). Non TDI related postings will be moved or removed.

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Old December 24th, 2009, 05:55   #1
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Default B5 TDI battery upgrade

The North American B5 Passat TDI came with a 72Ah battery, while the Golf and Jetta TDIs of the same vintage came with the larger 80Ah. The New Beetle had to make do with the 72Ah unit for space limits, however the Passat has no such limits. In fact, most Audi A4s, which ride on the same platform, came from the factory with the larger battery.

Old battery installed:

Old and new batteries:

So here is how you upgrade your Passat's battery when the time comes

The battery I am using is an Entertec model, from Volkswagen. I have found these are not only an excellent battery, but a pretty good value. You can also use an Interstate MTP-H7, which is also an 80Ah battery. Although most Interstate retailers will not stock one, they can all get one. The VW part number for the 80Ah battery is 000-915-105-AG (the standard 72Ah is the AF suffix). You will also need to order the different battery hold down (they call it a clamping strip) 8D1-803-123-D. Any Volkswagen or Audi dealer can order you one of these.

Here is the old battery hold down and the new one:

First, remove the cowl cover, and if you have a memory saver you can plug that into the cigarette lighter now (if you do not, you will lose the memory on your MFA, clock, and your ECU will lose its readiness monitors).

Remove the negative battery cable completely which requires a 10mm on the battery clamp and a 13mm on the body grounding point capnut.

Remove the 10mm nut holding the positive lead from the battery clamp going off to the car's electrical system (heading towards the brake master cylinder area). Caution: this leg will STILL HAVE LIVE POWER if you are using a memory saver, so cover it and do not let it touch anything metal!!!

Next remove the positive battery clamp 10mm holder, and pop the positive cable holder out of the body at the firewall, and swing it around and out of the way, over near the A/C pipes and pollen filter. This should not have any power on it now, as this is the main leg to the starter and alternator.

Then pop both ends of the vacuum tube running from the firewall pass-through grommet to the brake booster. There will be a hiss when you remove it from the booster, that is normal. Take care not to kink this tube.

Remove the battery vent tube from the side of the battery (positive cable side) and position aside.

Remove the bolt from the battery hold-down clamp, this is a 13mm, then lift the clamp away.

Now the battery is ready to come out. You will need to slide and tilt it towards the pollen filter side of the car a bit to get it to come out. Be careful not to lose grip of it and drop it on anything!

Now is the perfect time to clean UNDER the battery. I prefer to wipe the battery tray down and use some spray wax under that area, and make sure your grounding stud is clean and free of any rust or corrosion.

Locate the threaded hole in the body near the grounding stud. Depending on how much rust proofing your car recieved, it may be partially covered with goo. Clean that up, and make sure the threads easily take the hold down bolt. The thread is 8 x 1.25 if you need to use a thread chaser to clean it up, but generally some solvent or brake cleaner will remove any rustproofing and reveal a squeaky-clean virgin threaded hole.

Next, slide your new battery in.... take care is it is a little longer so it will be an even tighter fit. Make certain you have it oriented correcty, and make sure the vent plug is in the correct side of the battery, so you can reattach the vent tube on the opposite side.

Install the new clamp like this:

It is right next to the grounding lug, and then snug the bolt (it need not be very tight). Make sure it is at a right angle to the battery. Make sure the battery vent tube is put in.

Then reinstall the vacuum tube, popping it securely into the pass-through grommet and booster. Then lay the positive cable back over, attach it, attach the smaller lead from the car to the stud on the cable end, and pop the cable stay back into the firewall.

Put your ground cable back on, and snug the fasteners. Make sure the ground cable tang is at right angles to the battery. Once both cables are attached, you can remove your memory saver.

Reinstall the cowl cover, start the engine and let it idle for about 15 seconds BEFORE moving the car, so that the brake booster has adequate time to build boost for the brakes.

If you did not use a memory saver, you will need to reset your clock, and drive the car for all the readiness monitors to run (these will do so anyways, so you do not have to drive the car right away).

Dispose of your old battery in the proper manner.
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Old December 24th, 2009, 07:37   #2
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Excellent write up! Can we make this a sticky please?
2005 B5.5, TD Tuning, R783s, GTB2260VK, 6 speed O1E, BSM 2/09, Pod w/ 40 PSI & EGT Gauge, Thor Skid Plate, Cat FF, Euro switch
B4V, 2.0L w/ BHW pistons, Rosten Rods, Girdle, 11mm, GTB1756vk, RC6, PP764s, .622 5th, Colt Cam II, Ecodes W/leveling motors & Euro switch, fog lights, Koni Yellow, Cat FF, Whitbread 2.5" DP, exhaust, FMIC
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Old December 24th, 2009, 07:43   #3
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Nice Christmas present OH! I think I'm going with this install when my battery kicks it. The new battery looks like it has the removable screw caps under the sticker like the Varta. Is that correct?

Merry Christmas and a Happy New Year!
Thanks for all your great work on the forum. It is much appricated.
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Old December 24th, 2009, 07:45   #4
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Thanks, although you could have been a bit more timely and put this out yesterday when I was changing my battery
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Old December 24th, 2009, 07:53   #5
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This is def something to consider
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Old December 24th, 2009, 09:03   #6
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Excellent thread. Thanks OH.

Quick Q: if going with the Interstate MTP H-7, do we still need to get the new battery clamping strip? Reason I ask is Interstate has a distribution center in my city, so thought I'd try to get one of the blemished ones for $30-ish.

Thanks again, OH. Very helpful.
2005 Passat GLS TDI (sedan)
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Old December 24th, 2009, 09:13   #7
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Yes, the H7 will require the new clamp, as it is dimensionally identical to the AG suffix 80Ah Enertec.
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Old December 24th, 2009, 10:00   #8
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TDI(s): Out of TDI's
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Brian: thanks for the effort and the part numbers. My OEM battery is *still* going strong, but after 5 years and going on 80K miles, I have added it's replacement to my list of Preventive Maintenace items to complete this Spring or sooner (depending on my new hip rehabilitation progress).

I have a new relay 219 on the list along with a complete underside inspection of axles, boots, motor mounts, and the like.

I also have OEM mud flaps and a rear deck lid spoiler to install. Maybe new brakes and a brake fluid flush too!

Originally Posted by Big Mike View Post
........"Everybody has a plan until they get punched in the face." -- philosopher Mike Tyson.
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Old December 24th, 2009, 10:51   #9
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A nice XMAS present to the group! Procedure and alternative battery (I have had excellent resutls with Interstate Batteries), cool. Thank you.

What are Rediness Monitors and how does that affect operations when you get going again?
2005 Passat TDI Wagon
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Old December 24th, 2009, 11:38   #10
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Thank you Oilhammer. I am in need of a battery, and glad to add a boost in battery capacity. Excellent writeup with great photos

FYI for others, My local VW dealer quoted $19.80 for the hold down, and $110 for the battery (000-915-105-DH).

They said the -DH- was a replacement for the -AG-.
97 Passat 300k mi
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Old December 24th, 2009, 13:25   #11
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How handy! I am planning on putting a new battery in my passat probably this summer. Thanks OH!
2015 Golf SE TDI with DSG, 88k.
and formerly a 2005 Passat GLS TDI - RIP, 208k miles. Many good memories and friends made with this car.
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Old December 24th, 2009, 14:11   #12
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Readiness monitors are the checks that your engine ECU does periodically to make sure everything is working normally. If one fails, it will set a DTC in the ECU's memory, and if it fails enough, it will illuminate the MIL.

Any time the ECU loses its KAM (keep alive memory) all these monitors can be wiped clean, and will need to be reset by driving the car. This is not anything to worry about, except that if you are like us here in STL and your car requires an OBD check for inspections, you won't want to disconnect your battery then bring the car in for the OBD check, because it will fail due to unset readiness.
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Old December 24th, 2009, 14:25   #13
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Neat post, many thanks once again!
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Old December 24th, 2009, 18:30   #14
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TDI(s): Passsat
Fuel Economy: 31 mpg (city) / 38 mpg (hwy)

Hey 'Hammer....Merry Chrsitmas!

Which battery did you put in my BHW? (apparently I'm too lazy to look...LOL!).
Got Meleagris gallopavo silvestris?

Don't know what a "Snood" is? Click Here and Move Cursor Over the Beak

'05 VW Passat TDI GLS - The Unofficial TDIClub VW B5.5 Passat oil pump balance shaft crybaby!
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Old December 25th, 2009, 08:55   #15
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There's a long thread over in the Ontario Forum about batteries.

If you go to post #25 by TDI Power, and his subsequent posts, you'll see that for cold cranking (like up here in Canada), the SAE spec CCA is what is more important as it's measured at low temps, whereas the European DIN spec AH is measured at balmy temps. Oddly, TDI Power comes from Savannah, GA, but his arguments seem reasonable to me.

Here's a quote he posted in post #56:
Do not get hung up on Ah capacity of batteries . It has very little to do with the number one job of the battery which is to start your car. The 20 hour rate {ampere hours} is the ability of the battery to carry a low rate of discharge . For Example: A 100Ah Battery will carry a 5 amp load for 20 hrs before dropping to voltage of 1.75 volts per cell, or 10.5 volts on a 12 volt battery.5x20 = 100ah.This rate is measured at 80deg F when the battery is 100% efficient.Cold Cranking {CCA} is a rating taken at 40 deg F when the battery is only 40% efficient. The alternator carries the basic electrical load after the car starts.
Anyway, he is recommending a couple of Energizer batteries with high SAE CCA, rather than the VW battery with the high DIN AH.

You guys should check the Walmart for Energizer 94R

OEM battery
CA: 965 A
CCA: 765 A
Warranty: 3-Year free replacement 9-Year prorated A
Anybody have any experience mounting one of these or other Energizer batteries in a Passat?
EDIT: or rather than hijack this thread, the moderator should move it to a new one?
2005 VW Passat Wagen TDI dechained, 39mpgUS non-Winter
2011 Chev Cruze Eco (Turbo) 41mpgUS non-Winter
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Last edited by blaz; December 25th, 2009 at 08:57.
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