Battery Problems E320 1999

I have a E320 petrol mercedes and just recently the car will not start without a jump even after driving 100 klms the next day it sometimes needs a jump then sometimes i can use it for short trips 1klm 2klm and its
fine... there is no warning light coming on about the battery being flat i did have a new tow bar fitted and was wondering if it has been wired up wrong and draining the battery over night... any help would be appreciated Regards Steve
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multispacer wrote:

One important piece of missing info. How old is the battery? If it's 5+ years old, I'd just replace it as a first step. Do you have a charger? If so, did you try charging the battery and see if it holds a charge that way? If so, then something is wrong with the charging system in the car. Did you check that cables are tight, no corrosion, etc? If you're worried about a drain, you can disconnect the battery lead and measure the drain with no load. Or if you don't have the tools/skill, take it in. There are auto parts places here in the US that will do a battery load test for free.
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Thanks for the information I dont know how old the battery is but i assume its as old as the car... I read the manual and it said i had to disconect stuff before i could charge it so i didnt as i thought it may affect the electronics... please bear in mind im a plasterer and car stuff is beyond me... all the leads are clean and tight (no rust etc) I will do as you suggest and take it to a garage to test the battery for a possible drain when i get back to th UK in 5 weeks time... but in the mean time would it be possible for me to just connect a charger whilst the battery is in the car Regards Steve
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Batteries older than four years are suspect.
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On Tue, 07 Mar 2006 15:19:52 -0800, T.G. Lambach wrote:

I have 98 E320, the battery works great. My car has a 700 Crank Amp MB battery. Is it okay to use 650 crank Amp or something lower?
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It'll work, but not well. I'd go higher, but never lower.
--
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Of course it's OK, why would you even worry about it..... unless that is you are located in arctic areas where it get's very cold and/or your car has extreme difficulty in starting so that you need lots of reserve cranking ability...... but then you should get it fixed.
cheers, guenter

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- have specific gravity checked - top off with distilled water and trickle charge at 5-10 amps for several hours - check specific gravity in each cell to see if any cells are dead
- car charging via driving is almost never successful if the dead battery was well discharged. car charging systems in modern cars were never designed to pull a deep discharged battery back into full charge. they can only surface charge a battery, no matter how long the car is driven
- if ill maintained, sulfation can short out the plates and cells. nothing can be done but to purchase a new battery
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raymond- wrote:

Auto alternators AFAIK, are rated at upwards of 60A, so why are they not capable of fully recharging a battery, provided the car is driven far enough and assuming the battery is good? Also, I think at 5-10 amps, your definition of trickle charging is way off. That is the charge rate of a regular charger. A trickle charger is more on the order of 1 amp.
- if ill maintained, sulfation can short out the plates and cells.

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