SL/R129: Correct battery for R129
#1
Correct battery for R129
Hi there - my key fobs seem not to be working. I've changed with new key fob batteries but still no luck so I'm sorting the battery. I've looked up and most people highlight that 100ah is the correct one. My current one is 75ah 650a which I assume is not the best one. I can buy a 100ah 900 amp one from Halfords (yuasa). Do you know if this is the correct one? Would a poor battery account for the key fobs no longer working? (I can't get into the car as is currently locked and I don't want to manually open as I think this will trigger the alarm etc). I'm assuming that a new battery will sort this out :-)
#2
MBWorld Fanatic!
Hi there - my key fobs seem not to be working. I've changed with new key fob batteries but still no luck so I'm sorting the battery. I've looked up and most people highlight that 100ah is the correct one. My current one is 75ah 650a which I assume is not the best one. I can buy a 100ah 900 amp one from Halfords (yuasa). Do you know if this is the correct one? Would a poor battery account for the key fobs no longer working? (I can't get into the car as is currently locked and I don't want to manually open as I think this will trigger the alarm etc). I'm assuming that a new battery will sort this out :-)
Chances are that it's something else. A dying battery usually has enough power left to do many things but not crank the starter. Totally dead would be unusual. I'd open the door and see if anything electric works. Then you can check the battery voltage with a meter. If some electric consumers work but keyless entry doesn't there's something wrong with it specifically.
#3
Banned
#4
Thanks for your replies. I got into the back boot and am charging the battery to see what happen when I put it back. If I get access with a key, do you know if the car will likely start even if the keyless fob has previously closed the car? Is there an immobiliser which stops this?
Sorry for all the questions- I’m new to this! R129 is 1997 280 if that helps.
Sorry for all the questions- I’m new to this! R129 is 1997 280 if that helps.
#5
MBWorld Fanatic!
Thanks for your replies. I got into the back boot and am charging the battery to see what happen when I put it back. If I get access with a key, do you know if the car will likely start even if the keyless fob has previously closed the car? Is there an immobiliser which stops this?
Sorry for all the questions- I’m new to this! R129 is 1997 280 if that helps.
Sorry for all the questions- I’m new to this! R129 is 1997 280 if that helps.
#6
Thanks for all you advice. I put the old battery back in. Got in with the key. The roof is now working fine after s reset and one key fob has come back into life! So it seems like the car needed a re-set and now all is well!!
Out if interest, is there any reason why the original vat battery was 100ah if a less powerful one can do the job?
Out if interest, is there any reason why the original vat battery was 100ah if a less powerful one can do the job?
#7
MBWorld Fanatic!
Thanks for all you advice. I put the old battery back in. Got in with the key. The roof is now working fine after s reset and one key fob has come back into life! So it seems like the car needed a re-set and now all is well!!
Out if interest, is there any reason why the original vat battery was 100ah if a less powerful one can do the job?
Out if interest, is there any reason why the original vat battery was 100ah if a less powerful one can do the job?
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Andykin (06-24-2019)