Loss Of Battery Power

[tommy81]

Hi All,

Im having problems with my Battery power (IS200), its been replaced and still its loosing power if i leave it for any length of time.

Does anyone have any ideas of what might be the problem??

[lex2oos]

I would check which circuit draws the most power.

take out fuses one by one and check amperage with multi meter.

[tommy81]

I would check which circuit draws the most power.

take out fuses one by one and check amperage with multi meter.

Much appriciated i will give it a try.

[eigenvalue]

I have also been concerned about Battery drain while standing unused. The other day I measured the 'dark current', i.e. the current drain while parked, and it was 32mA. This is presumably accounted for by the alarm and other things which are always on. After a very rough calculation on this it would seem that the Battery would be completely flat in around 2 months. I now give the Battery a charge every week if the car has not been used.

[SpokesT]

I had an issue with my Battery yesterday which LED to me sticking it on the Optimate overnight. It's now fully charged but the Optimate is giving me the 'weak' LED which makes me think the Battery is gunna need replacing. I suspect it's the original factory fitted one, on my 52 plate IS200, so I suoppose it's had a good innings as they say.

There are lots of different prices coming up on the net, does anyone have any particular Battery I should avoid if I am after longevity, or will anything fit the bill as long aas it's the correct fitment? I'm not particularly flush right now as I've just had the cambelt done, taxed it and have the mot being done tomorrow, so any savings will be welcomed - without buying the cheapest one and having to replace it again in a year's time, obviously.

Any suggestions etc?

[TonyGoose]

Get new Battery from dealer for around 65 quid with a 4 year warranty

TG

[BenIS]

Its a coincidence that this post has come up as through no fault of my own i havent been able to drive my IS for exactly 2 months today but i went out to start it up today and the Battery hasnt even got enough in it to start it up. gutted!

[baibe 13]

I have the same problem with car Battery - its been replaced and still its loosing power if i leave it for any length of time.

Does anyone have any ideas of what might be the problem??

(maybe stereo after make is the reason?..)

[rincewind]

I know people on the BMW forums who use something like this:

trickle charger

There are a number of different variants output wise and they do the trick if the car is left standing for a while.