stock545i

If you run a search "register battery" you'll see many post's regarding the issue:

Here are a few links:

Link 1

Register Battery What

Go to the bottom of this link and read "Why register the battery replacement....

Why Register the Battery Replacement

This link Battery Registrationis a good source.

I am using AGM batteries all around.

Good luck with your selection.

w5lx

From Motor Magazine:
Foreign Service

By Dan Marinucci | June 2009

"Vehicles are becoming increasingly self-aware with each passing year. It?s no longer enough to replace a battery when necessary. Many late-model BMWs also need to know when you replaced it.

Last month I discussed a timely trend in higher-end European electrical systems, the absorbed glass-mat (AGM) battery. This time I?ll focus on another one, relearning BMW charging systems after battery replacement. You read correctly?relearning the charging system!

First I?ll recap the AGM battery information. An AGM battery is more damp than wet inside because it isn?t flooded with liquid electrolyte like a traditional battery is. Also, AGMs are designed to be very low-gassing batteries. These features make them especially well-suited for locations inside the vehicle. Some higher-end European vehicles have an AGM battery somewhere inside the vehicle powering on-board electronics while a separate battery under the hood handles starting duties. Finally, fully recharging an AGM battery safely and quickly requires an AGM-capable charger.

Okay, let?s get back to those late-model BMW charging systems. First, the electrical system is so sophisticated that it tailors charging as closely as possible to both the type and the age of the battery. There?s a computer, which goes by several different names, that controls the alternator. Whenever you replace a battery, this computer really needs to know because it doesn?t charge a fresh battery the same way it charges an older battery. What?s more, this computer needs to know if you?ve updated a vehicle from a conventional battery to an AGM type; it charges the AGM differently than a traditional battery.

Second, the process of updating this alternator-control computer is called battery registration. You don?t absolutely have to register every new battery you install in these late-model BMWs. Ignoring the registration process after replacing a battery won?t trigger a DTC or turn on the MIL. However, a savvy BMW specialist warned me that skipping the battery registration process can dramatically shorten the life of a battery in these vehicles, be it an AGM or a conventional battery. For instance, he?s diagnosed cars on which a new battery didn?t even last a year because it wasn?t registered! The charging system could shorten the life of an unregistered battery by charging it too aggressively when it?s cold; it also could shorten the life of an unregistered AGM battery by overcharging it, he said. To say the least, premature battery failure can be aggravating for the customer and embarrassing for you and your shop.

Third, several problems can cause premature battery failure. On a late-model BMW, skipping battery registration can be one of them. Don?t gamble; always register a new battery on any BMW equipped with MOST Bus?a single-line, fiber-optic ring network BMW introduced in the early 2000s. Typically, the easiest way to identify a vehicle equipped with MOST Bus is to look for iDrive. In turn, the quickest way to spot iDrive is to look for the fancy LCD control display screen up on the instrument panel. Among other things, this display screen shows the driver climate control functions, navigational info, entertainment system controls, etc. (To my knowledge, the lone exception to this is the 2006 3-series cars without iDrive, which still use the MOST Bus network.)

Here?s when MOST Bus appeared on the most common BMWs your shop would encounter:

?2002 for 7-series (E65/66 vehicle platforms);

?2003 for 6-series (E63/54 vehicle platforms);

?2004 for 5-series (E60/61 vehicle platforms);

?2006 for 3-series (E90/91/92/93 vehicle platforms);

?2007 for X5 series (E70 vehicle platform);

?2008 for X6 series (E71 vehicle platform).

Fourth, registering a battery is easy but it requires a scan tool that communicates effectively with these BMWs. If you want to service more of these vehicles, shop for scanner updates or a new scan tool that will do the job. The screen capture on page 10 from an AutoLogic scan tool is an example of one of those you?d see during the battery registration. You also could look up battery history on this same screen. Notice that the first entry is ?Last battery replacement (km)?and the reading is 0.00. Meanwhile, all the remaining entries are the same value of 528,392 km (about 328,000 mi.). These readings show that if someone has replaced this car?s battery, he did not register it.

One BMW specialist pointed out to me that sometimes you can quickly check to see if the car?s got the original battery in it. He said that BMW traditionally stamps the battery?s manufacturing date on the negative terminal. The date stamp shows the week first, then the year. For instance, ?42 05?indicates the 42nd week of 2005; ?33 07?would mean the 33rd week of 2007. If the date stamp on the negative battery terminal is fairly close to the vehicle build date, then it?s extremely likely that it?s the original battery.

Look at the screen capture again. The BMW ace told me that if the battery had been replaced and registered correctly, the number in the top box or window would be 1.00. Next, the second entry there would be the kilometer (km) reading when the new battery was registered. Then, the rest of the entries in those little windows would show the vehicle?s then-current km (odometer) reading.

Last but not least, you need to know where to find the registration process within the BMW system. A BMW-capable scan tool initially shows a variety of windows or boxes on the screen. Sometimes you?ll see a window labeled BATTERY REGISTRATION REPLACEMENT; that choice is a no-brainer. On the 7-series cars, choose the Power Module (PM) window to access battery registration. Otherwise, the most common way to reach the battery registration is through the window labeled DME (Digital Motor Electronics). Just choose the appropriate window and then follow all the prompts.

Hopefully, these basics will save you some headaches. After all, customer expectations here are likely to be much greater than they are for many other vehicles you repair. If nothing else, you know what?s required if you decide to subcontract this task to a BMW specialist."

5FOUR5

You're so quick to point out the lack of a micro-processor, please do your homework on mechatronics, how IBS works, along with the various functions of the dme / dde. There IS a battery sensor (b895) which in turn transmits data through the ivm.IBS cables have a dedicated connector to the dme for this specific purpose of transferring data. $125 for a quality battery which meets or exceeds manufacturers specs?? You would be providing the forum a great service if such a battery existed, or if you simply held back on the level of ignorance that your post clearly displays.

safetywork

W5IX, Wow. Thanks for the info! I didn't know the recharging the system varied from one battery to the next, it makes sense though. My how cars have changed.....

2002

I changed out the battery yesterday with an OEM battery and had it registered. Apparently, the battery was changed in 2007. I was wrong about the battery being 6 y/o. The tech said it is necessary to have the battery registered for the alternator to feed the battery the right amount of charging. It is NOT BS to register a NEW battery.

On a side note, the peep hole of the battery which indicates the state of the battery (green-charged; black-insufficient charge) is not that reliable because it only lets you see one cell of the battery. Hope that helps.

JerseyGeorge

THERE IS NO PROCESSOR IN THE BATTERY.....that's what I said! Comprehension isn't your strong suit I see and neither are manners and tact! I stated my opinion from experience not just because. I do agree with you that a good battery will run more than what I said....more like $170. I could point out many, many posts on this forum and others that people have been replacing batteries without registering with NO problem. You want them to drink the kool aid too while they wait for you to "register" their battery?

"how IBS works, along with the various functions of the dme / dde. There IS a battery sensor (b895) which in turn transmits data through the ivm.IBS cables have a dedicated connector to the dme for this specific" Now you just showing that you're a TOOL