wilko50
Active Member
- Joined
- Mar 3, 2012
- Messages
- 62
- Car
- W211 280 CDi -OM642- Engine
Hi to you all. This is regarding the main battery in the boot ! I just want to share something that I experienced with my car so you don't have to make the same mistake. My 2005 E Class CDI, (OM642) was suffering from low voltage although the battery I got from Tanya was only a year old. It was reading 11.9 volts in the morning, would start, but all sorts of odd things were happening like the alarm would go off unlocking it, one the the door modules packed up. Also kept getting "Convenience features not available" message even after a long drive, and the heater stopped working.
I did some research and found that only AGM batteries should be placed in these cars, the lead acid type get wrecked by the powerful electrical systems in these vehicles and do not cope well. I looked everywhere for the best deal on a AGM and found Mercedes main dealer to be the best , and they were £40.00 cheaper then Halfords for a Varta , it cost me £200.00 including VAT.
I installed it and all the problems disappeared within a few days without replacing or repairing anything. Resting volts in the morning are now 12.6 to 12.7. For a long time with the lead acid battery I thought I had a power drain from a bad module ( like the door) but that was not the case. The car is now problem free regarding the electrics and it has made a huge difference. I was not aware that lead acid batteries are not suitable for these cars as other people may not be. Many of you will already know but some wont so I hope I have helped.
I did some research and found that only AGM batteries should be placed in these cars, the lead acid type get wrecked by the powerful electrical systems in these vehicles and do not cope well. I looked everywhere for the best deal on a AGM and found Mercedes main dealer to be the best , and they were £40.00 cheaper then Halfords for a Varta , it cost me £200.00 including VAT.
I installed it and all the problems disappeared within a few days without replacing or repairing anything. Resting volts in the morning are now 12.6 to 12.7. For a long time with the lead acid battery I thought I had a power drain from a bad module ( like the door) but that was not the case. The car is now problem free regarding the electrics and it has made a huge difference. I was not aware that lead acid batteries are not suitable for these cars as other people may not be. Many of you will already know but some wont so I hope I have helped.