BMW 3-Series Key Fob Battery Remote Replacement E36, E46, E90, F30, F31, F34 (1990 – 2019) including Diamond Key

The 3-series is one of BMW’s oldest sedans. It has has nearly every major key fob that BMW has produced. The past major internal name models have been the E36, E46, E90, F30. For other models, see the all BMW Key Fob Batteries page.

ModelTrimsKey Fob TypeSubTypeBatteryBuy
E36 3 Series316i, 318i, 318is, 320i, 323i, 325i, 328i, M3, 318tds, 325td, 325tdsU Shaped KeyCR2016
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E46 3 Series316i, 316ci, 318i, 318ci, 320i, 320ci, 323i, 323ci, 325i, 325ci, 328i, 328ci, 330i, 330ci, M3, 318d, 320d, 320Cd, 330d, 330CdDiamond Shaped KeyRequires solder, soldering gun, and rechargeable battery with legs to replaceVL 2020 3v
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E90 3 Series316i, 318i, 320i, 320si, 323i, 325i, 328i, 330i, 335i, 335is, M3, M3 GTS, 316d, 318d, 320d, 320d ED, 325d, 330d, 335dRectangular Shaped KeyComfort AccessCR2032
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E90 3 Series316i, 318i, 320i, 320si, 323i, 325i, 328i, 330i, 335i, 335is, M3, M3 GTS, 316d, 318d, 320d, 320d ED, 325d, 330d, 335dRectangular Shaped KeyNon Comfort Access. Requires solder, soldering gun, and rechargeable battery with legs to replaceVL 2020 3v
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F30 3 Series316i, 318i, 320i, 320i ED, 328i, 330i, 335i, 340i, ActiveHybrid 3, 330e, 316d, 318d, 320d ED, 325d, 328d, 330d, 335d Trapezoid Shaped KeyCR2450
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F31 3 Series328i, 320d, 330d, 320i, 316d, 318dTrapezoid Shaped KeyCR2450
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F34 3 Series Gran Turismo320i, 328i, 335i, 318d, 320d, 325dTrapezoid Shaped KeyCR2450
Check on Amazon

How to replace the F30 3-Series (2013-2019) key fob battery

This model uses the easy to change BMW Trapezoid Shaped Key. This takes a simple CR2450 coin battery type. You don’t even need any special tools to change this one. Here’s a video showing how to change or replace the battery:

2013 - 2019 BMW 3 Series Key Battery Replacement F30 Fob Remote

Sale
Energizer Lithium Coin Blister Pack Watch/Electronic Batteries, 1 Count (Pack of 2)
  • Pack of 2 batteries
  • Lithium coin batteries for watches and electronic devices
  • Has a power of 3 volts

This key is also used in the F31 3 Series 328i, 320d, 330d, 320i, 316d, 318d (2013-present)
and the F34 3 Series Gran Turismo 320i, 328i, 335i, 318d, 320d, 325d (2013-present)

How to replace the E90 3-Series (2006-2012) comfort access key fob battery

Battery: CR2032

2006 - 2012 BMW 3 Series Key Battery Replacement E90 Fob Remote

Amazon Basics 4 Pack CR2032 3 Volt Lithium Coin Cell Battery
  • IN THE BOX: 4-pack of CR2032 3 volt lithium coin cell batteries; replacement for BR2032, DL2032, and ECR2032
  • DEVICE COMPATIBLE: Ideal for watches, calculators, key fobs, Apple TV remotes, and other small electronics
  • DESIGNED TO LAST: 8-year leak-free shelf life

How to replace the E90 3-Series (2006-2012) non comfort access rectangular key fob battery

The rectangular remote has a rechargeable VL2020 battery inside that is recharged when the key is in the ignition. It may die eventually though and need to be replaced. To change this non-comfort access battery, pry apart the key and de-solder the two points that connect the battery to the circuit board inside:

2006 - 2012 BMW 3 Series Non-Comfort Access Key Battery Replacement E90 Fob Remote

Buy this battery on Amazon, make sure to get one with 90-degree connection points:

Keyecu VL2020 Remote Key Rechargeable Battery for BMW E46 E60 E92 3 328 330 X5 (90 Degree Leg)
  • Battery Model: VL2020
  • Please compare the leg position carefully,this battery is 90 degrees leg
  • it is a Rechargeable battery

How to replace the BMW Diamond key fob battery E46 3-Series (1998-2005)

This requires a solder iron, and a VL2020 rechargeable battery to replace this key fob. Also a box cutter or utility knife is handy to cut open the key fob. Watch my video on how to replace the E46 key fob battery:

1998 - 2005 BMW Diamond Key E46 3 Series Key Fob Battery Replacement DIY

Keyecu VL2020 Remote Key Rechargeable Battery for BMW E46 E60 E92 3 328 330 X5 (90 Degree Leg)
  • Battery Model: VL2020
  • Please compare the leg position carefully,this battery is 90 degrees leg
  • it is a Rechargeable battery

GIF Visual Guide

Alright. In this video, I’m going to show you how to replace the battery in this BMW diamond key that was used in the E 46. This is for the 3- series from 1998 to 2005. BMW cars. So this is a fairly complex change, but I’m going to get right into it here.

So the first thing you need to do on this key is you need to separate it into two halves. So you’ll notice around the edge here, there’s kind of a line that separates this key Fob into two pieces . What you’re first going to do is take a box cutter and score all the way around, cutting through and actually breaking through the plastic all the way around this key. And this may take some time.

This may take five minutes. This could take ten minutes. If you want to kind of do it carefully, try to keep the key as intact as possible. But the best key that I found to get some leverage was right here at the top. You can eventually cut through and then you can see the box cutter even going through there to start to get some separation between these two pieces.

So once you score all the way around, you’ll be able to separate these two pieces here and get access to the circuit board and the battery that we’ll need to replace. Now, the battery that you need here is a VL 2020. This is a rechargeable battery. Normally, when the key is in the ignition, this battery charges. But for whatever reason, if it dies and you need to replace it, this is what we’re going to show you how to do.

So inside this part of the Fob here, there’s a circuit board that you can remove. You can see there’s kind of two points that connects here and you can just probably kind of tap it out like so you can’t tap it out, maybe some small tweezers here, get that circuit board very delicately pull that out. Okay. So the circuit board here is what we’re going to be working on. The key here is this battery that we want to replace.

There’s two points that’s attached to the board here. You can see these two points of solder here and here. These are called the legs of the battery. And these are where the battery actually attaches to the board. So to replace this battery, we need to get these desolder.

And then when we buy replacement, make sure that you buy one that has legs that are offset 90 degrees here and here, not that’s offset 180 degrees, because then it won’t match up with your circuit board. So I’ve got a soldering iron here and a little soldering vacuum. And what I’m going to do is just desolder these points here. And I just got this soldering iron for $19 on Amazon. And if you’ve never soldered anything before, don’t worry.

This is actually not a bad little spot. To learn because there’s not a whole lot you can screw up too much here. So what I’m just doing here is melting the solder and then suck it up. And I’m just going to melt some more here. Just decent amount and suck it up.

Okay. So we’ve got quite a bit removed there on that one. I’m going to do this other point here and see where we’re at that’s melted down nicely. A little more off here.

Okay.

So you can see all this s older that we’ve gotten off of here. And now this should allow us to easily pull off the VL 2020 rechargeable battery here from the circuit board. So let’s see how we did. Excellent. Okay, so we’ve still got a little bit of solder there that we need to go.

So actually, this time I’m just going to melt it and see if I can let it drop through. There we go. Perfect. So, yeah, sometimes you can just have to suck it all away, but just melt it out. And there we’ve got the leg of the battery out on this one.

The second leg disappeared over the years. But that’s okay. I think we’ll still be able to attach it here, Especially since we have a new battery. So new battery. Make sure that we’ve got leg here and a leg over here.

This one only has one. If you only have one, then work with what you got. So we’re going to resolder this now. Attaching the battery there.

And the second point, the leg would actually go right in here. So I don’t have a new battery. But we’d take the new one, make sure that the legs get in through those two points there.

I’m going to actually clear off some of this solder here to make a little more room here and get the legs in through there.

And then we are going to resolder once we have this actually attached here.

Okay. Then we’ll take a little bit of solder and just solder on these points here.

Okay. And then the other leg over here like so. Okay, so now we’ve resoldered the new battery onto the board here and then we’ll go ahead and just replace this back into its correct spot. Make sure the buttons here are going to the button side here. So flip this over and make sure that aligns back in there correctly.

All right. Snaps right in and then I’d apply some super glue here around the edges and then put the battery back together or the Fob back together. And if you superglue that, then you have a brand new working key Fob with a new VL 2020 battery on your 3- series for the E 46.

How to replace the E36 3-Series (1990-1997) key fob battery