[kern417]

mine is not comfort access, so like I said i think the ignition switch i installed a few months ago is faulty. for some reason it's not charging when I drive around.

[Soravia]

I cut opened my NON Comfort access key using a carpet cutter knife, down and away from hand (wearing mechanic gloves), many times and got it cut opened. I pried it using flat head once one side was cut open.
I replaced using Amazon battery and cover that snaps on and off. Battery solders on and off easily. Just got to make sure they sit as low as possible.
It worked first few times but now it doesn't. I'm trying to charge it in the car right now. If that doesn't work, I'll try my tooth brush charger. The car is on Duralast trickle charger so the battery shouldn't have issue.

[kern417]

Originally Posted by Soravia

I cut opened my NON Comfort access key using a carpet cutter knife, down and away from hand (wearing mechanic gloves), many times and got it cut opened. I pried it using flat head once one side was cut open.
I replaced using Amazon battery and cover that snaps on and off. Battery solders on and off easily. Just got to make sure they sit as low as possible.
It worked first few times but now it doesn't. I'm trying to charge it in the car right now. If that doesn't work, I'll try my tooth brush charger. The car is on Duralast trickle charger so the battery shouldn't have issue.

I'm hoping this works for me. I switched to my backup key. If in 3-4 months I don't get the error, then I know the ignition switch is charging properly and it's just my 10year old key not holding a charge anymore.

[Soravia]

Originally Posted by kern417

I'm hoping this works for me. I switched to my backup key. If in 3-4 months I don't get the error, then I know the ignition switch is charging properly and it's just my 10year old key not holding a charge anymore.

One of the key works and not works. I had double checked the solders.
The other only unlocks but won't lock the car.

So it's hit or miss? LoL Both keys went into washer and dryer before the battery swap.

[kern417]

Originally Posted by Soravia

One of the key works and not works. I had double checked the solders.
The other only unlocks but won't lock the car.

So it's hit or miss? LoL Both keys went into washer and dryer before the battery swap.

Both keys work, i just get the error with my old key. Bought the car with one key, so bought a backup from the dealer at the same time. Now that my normal key appears to be dying, I switched to my backup key and no errors are showing.

I was assuming that the replacement ignition switch I installed 3 months ago wasn't charging it. So to eliminate it as a potential concern, I'm going to use the new key and see if it starts throwing the error after a few months. If so, then I know the ignition switch isn't charging it. If no error, then it's charging fine and my old battery just can't hold a charge anymore.

If someone has an idea on how long it would take for a non comfort access key to completely drain it's battery without charging, that would help too. otherwise I can only go off of my experience.

[Soravia]

Is it possible to switch to comfort access forb? I'd rather swap battery every two years

[kern417]

Originally Posted by Soravia

Is it possible to switch to comfort access forb? I'd rather swap battery every two years

Honestly not sure, but I assumed it would also be more expensive. But I agree that's much easier.

[liquidsmoke]

So can I use any inductive charging pad for iPhone etc; and it will charge my e92 fob ok?

[BlackNight28]

I did like Soravia did but instead of soldering a replacement battery in I left the leads for the old battery in-place and removed the flat top and bottom tabs from the old battery (took a bit of prying). Remember which tab went to the top or +. Bought LIR2032 recharable batteries from Amazon and along with a new case, laid the new battery (bottom) - in the new case and placed the + tab on the top and snapped the case together. Thought I'd screwed up but accidently pressed the lock button and heard the locks engage in the garage. So far, it charges and does what a good fob should. Did I get lucky? Probably. But it works and I'm happy.

[liquidsmoke]

I did get a wireless charger to try to resurrect my fob that’s not working for remote locking; but i don’t think it’s gonna work, cos it seems like the charger pad doesn’t stay online when I only have the key fob placed on it…ie when I put my phone on it, it stays online with led indicator to show its charging it up, but if there’s only the key on it, it doesn’t stay online…
This is the one I’m trying:
yootech Wireless Charger,10W Max Fast Wireless Phone Charging Pad Compatible with iPhone 14/14 Plus/14 Pro/14 Pro Max/13 Pro Max/13/13 Mini/SE 2022,Samsung Galaxy S22/S21,AirPods Pro(No AC Adapter) https://amzn.eu/d/9qY9hqx

Does anyone know if there’s a different charger that will stay online even if there’s only a key placed on it?

[BlackNight28]

I tried a couple of the batteries with solder-in connectors for the existing fob. The idea is sound but the replacement batteries were crap and didn't work well. Looked like the connectors were resistance welded to the batteries (can't help wonder that did to the battery itself). Those replacement batteries were 3.4v and had no charge present in the battery either. The battery I used was a 3.6v and probably had a bit of a charge present. It still works too with no low battery showing during starting or shut-down. Just sayin'.

[liquidsmoke]

Originally Posted by BlackNight28

I tried a couple of the batteries with solder-in connectors for the existing fob. The idea is sound but the replacement batteries were crap and didn't work well. Looked like the connectors were resistance welded to the batteries (can't help wonder that did to the battery itself). Those replacement batteries were 3.4v and had no charge present in the battery either. The battery I used was a 3.6v and probably had a bit of a charge present. It still works too with no low battery showing during starting or shut-down. Just sayin'.

What do you mean when you day "low battery showing during starting or shut-down"; is there supposed to be some warning in the car for the fob battery health?

[BlackNight28]

Originally Posted by liquidsmoke

What do you mean when you day "low battery showing during starting or shut-down"; is there supposed to be some warning in the car for the fob battery health?

If the battery needs charging this symb shows. see previous posts as some show this in pic.

[dr.ashoka]

Originally Posted by Soravia

Is it possible to switch to comfort access forb? I'd rather swap battery every two years

Yes, it is possible to switch to comfort access key fob. I got a comfort access key fob on eBay with the same frequency as my original key fob, got it programmed and voila my new comfort access key fob works perfectly. Now I have to just change the battery when it runs out.

[M-technik-3]

My Samsung inductive pad does not illuminate to say it's charging. How would i know if the battery in e90 with comfort access is working to charge it?