Another R230 battery question

[peterws1957]

The SL is now stored where there is no power supply and no means of using a solar powered charger. I'm tempted to remove the consumer battery entirely and connect to the CTek at home, during the winter period. Is there likely to be a problem with leaving the battery disconnected from the car over long periods other than resetting windows etc and ensuring the terminals in the car are safe. The car will start without the rear battery obviously, but will starting have an adverse effect on the electrickery?

 

[LostKiwi]

I don't envisage any issue doing that but would not start it with the battery removed.

 

[sonic]

I would be tempted to remove the battery once a month charge it & put it back in the car.

 

[noonboots]

If the battery is healthy and fully charged it will last months if you simply disconnect it.
Another question.. Do these cars actually start without the rear battery? Not should they, do they?
Has anyone actually done it? I ask because the rear battery activates the starter solenoid. Is all power required totally redirected from the start battery through the BCM?
This problem occurred last week for an owner on a Facebook group. He had a totally flat rear battery had multiple warning lights and his car wouldn't start. I pointed out the starter solenoid issue and told him to fit a new battery. I was cried down by people saying it should start on one battery so he must have other problems. He fitted a new battery and all of his problems were gone. Was I right or does his car have a fault? Personally I think the charging system on the R230 is the most ridiculous piece of engineering I ever seen on a vehicle. Not only unreliable but dangerous as well.

 

[Mark Q]

Sorry to ask another R230 Consumer battery question, but seemed like a good place to butt in.

I replaced consumer battery on Monday with a shiny new Mercedes one all the way from Mercedes Grangemouth (Thanks guys).
It is a joy to get in and have the steering wheel come to meet me, be able to open the roof, turn on the rear demist etc, and not have to wait
for 5-10 mins before I can. Now before I replaced it the battery was always connect to my Ctek MX5, but still the consumer warning lit up> date stamp 2008.

Question > should I now still connect my Ctek to the new battery when not using for say a week or so, or should I leave alone until I start to get warnings when I start up ? I'm trying to do what's best to conserve the new battery.

Thanks.

 

[LostKiwi]

Personally I'd connect it.
These cars hate not being used.

 

[Blobcat]

I’d also have a battery conditioner on every time you park up

 

[ajlsl600]

Always had ctek on Vdoz never had starting issue. When consumer un avail started comming on and taking ten min to go out I replaced it

 

[noonboots]

I just started and used my car after it standing for 2 weeks and 3 days. No consumers off line warning. Seems sometimes they do work.

 

[flowrider]

My SL rear battery lasts about 4 weeks without use before needing a recharge. The battery is now about 5 years old.

 

[Mark Q]

I'll unplug tonight and do my 200miles tomorrow then nay see how long it lasts

 

[00slk]

Just for the record r230 especially the 500 or 55 don't start with a flat boot battery, so guessing a disconnected boot battery won't start it either?

 

[flowrider]

Just for the record r230 especially the 500 or 55 don't start with a flat boot battery, so guessing a disconnected boot battery won't start it either?

How flat is flat? My SL500 has started even though the consumer battery was "flat" i.e no parking sensors, no door locks, no seat adjustment, basically nothing worked but the car started.

 

[ajlsl600]

How flat is flat? My SL500 has started even though the consumer battery was "flat" i.e no parking sensors, no door locks, no seat adjustment, basically nothing worked but the car started.

Batt under bonnet starts car, batt in boot runs consumers

 

[00slk]

How flat is flat? My SL500 has started even though the consumer battery was "flat" i.e no parking sensors, no door locks, no seat adjustment, basically nothing worked but the car started.

Batt under bonnet starts car, batt in boot runs consumers

Consumer battery was very flat on the '05 car, I had to use the blade key to open the door. I put the key into the ignition to start it and there was nothing. Once I opened the boot, again with the blade and swapped the battery the car started.
My 55 had a similar problem the day after I bought it, wouldn't start, so swapped the boot battery with an old one out of another car I had and it started. On the 55 I also checked the volts on the front battery at the time and it was low, but after using the car it seemed to charged itself up.
The 55 has a fairly recent starter battery, at present the boot battery is disconnected, I see if it will start later today

 

[sausage]

Good luck

 

[ajlsl600]

Consumer battery was very flat on the '05 car, I had to use the blade key to open the door. I put the key into the ignition to start it and there was nothing. Once I opened the boot, again with the blade and swapped the battery the car started.
My 55 had a similar problem the day after I bought it, wouldn't start, so swapped the boot battery with an old one out of another car I had and it started. On the 55 I also checked the volts on the front battery at the time and it was low, but after using the car it seemed to charged itself up.
The 55 has a fairly recent starter battery, at present the boot battery is disconnected, I see if it will start later today

Some where on here I seem to remember there is a write up on how all that works. I vaguely remember there was a model of r230 where some link between the 2 batts or circuits existed. Hopefully someone can link you to that wrote up maybe from the late television? I kept all info on r230 Vdoz I cud find in car. It went with it when sold.

 

[00slk]

Some where on here I seem to remember there is a write up on how all that works. I vaguely remember there was a model of r230 where some link between the 2 batts or circuits existed. Hopefully someone can link you to that wrote up maybe from the late television? I kept all info on r230 Vdoz I cud find in car. It went with it when sold.

ajlsl66.......I stand corrected, I just started the 55 with the boot battery disconnected
The 05 500 wouldn't start with a boot battery flat, so I am just wondering whether the flat consumer battery draws too much from the starter battery to get it started. Maybe I should have disconnected the flat consumer battery first??

Anyway, you are absolutely right and I was so wrong, so everyone please ignore my useless information

 

[ajlsl600]

Look that write up I refer to it was chapter n verse on that subject

 

[flowrider]

Batt under bonnet starts car, batt in boot runs consumers

I know, we are discussing a flat consumer battery.