Battery losing charge very quickly.

[bechuetijunior]

I have Discovery II V8 and when it is idle for seven days, the battery drains completely! The battery is new and 75Ah. Can anyone tell what's going on?:eek:

[]'s

Antonio Bechueti Jr
Brasil

[Scouse]

You'll need to do a few checks yourself.

Any interior lights staying on?

Non-genuine alarm fitted?

Have you measured the current draw?

Does the battery go flat when disconnected from the car?

[disco2hse]

Get it tested (electrolytes, charge holding ability, charge time, that sort of thing) and get the age checked (it may be older than you think). A good new battery should last you more than six years.

On the other hand, if you have an electrical fault that is draining the battery then that may be a cause. So, it may be draining while you are running (not being charged by the alternator) or it is being drained when not running (something is not switching off or there is a short perhaps). In the latter you can see what kind of current is being drawn off the battery when it is not running.

Auto sparky can check the three within minutes (say 30).

[LandyAndy]

Does your Disco have ACE by any chance????
If so mine is doing the same,the ACE system is stopping the electronics in my vehicle from "going tp sleep"
I now remove the ACE relay in the fuse compartment under the bonnet when the vehicle isnt used,stops the battery going flat.
Andrew

[Blknight.aus]

it can also be the security system. if you park near enough to something thats on the same freq as the keyfob the system wont goto sleep as its thinking its got to stay awake to decode the command thats about to come but never does.

(sort of like fry's dog in futurama)

[disco2hse]

(sort of like fry's dog in futurama)

We can't watch that episode. SWMBO cries every time its on.

:BigCry:

[blackbuttdisco]

Had the same problem with my D1. Eventually changed the alternator and its been good since.

[ScottW]

Get a multi-meter that measures amps drawn. Disconnect the battery and connect the multimeter accross the gap to see what current draw you have when the car is idle. Mine had about 3 amps, which was enough to flatten the battery overnight. I'm not sure what the acceptable limit is, but it seems to be around 0.05 amps according to this site:
Battery runs down (http://www.aa1car.com/library/battery_runs_down.htm)

My car had a new battery and alternator when I bought it, so someone had been chasing the flat battery problem. I pulled 1 fuse and it's been right since.

[Lionel]

My car had a new battery and alternator when I bought it, so someone had been chasing the flat battery problem. I pulled 1 fuse and it's been right since.

For the benefit of the forum, it would be useful to know which fuse you pulled! ;)

Cheers,

Lionel

[ScottW]

For the benefit of the forum, it would be useful to know which fuse you pulled! ;)


The one that was hot when I touched it :D

Either my interior light was shorting somewhere, or there was something additional wired in that was the problem.