Sorry I forgot to say both were new batteries. The first battery was new last
year, when the car was finished. The battery was flat after being left 2 weeks,
and I thought it was a faulty battery. It was replaced, and I kept the battery
on charge in the garage on a smart charger over Winter.
The car drove to Stoneleigh and home no problem (left overnight with alarm on
as well during weekend). The week after (having been used off and on I started
and moved it on the Friday, on the Sunday I went to open the boot and the
battery was dead flat. It was replaced again (a good supplier!), but I can't
expect to rely on their generosity again, and I need to be able to have
confidence that all will be ok.
----- Original Message -----
From: Derek Clews
To: [email protected]
Sent: Monday, May 24, 2010 9:03 PM
Subject: Re: [Quantum Owners] Battery drain
Hi. If you have a possible problem with the battery, try disconnecting the
battery (and remove from the car if convenient) just charge via a mains charger
and then check the voltage after a good charge and over a period of time after.
If it goes down to below 12V sitting over a day or two it is shot. You cannot
get a real view of the battery while connected it may be a drain from the car.
This has worked for me with cars and the canal boat. (four batteries in two
banks!)
Alternatively, try and see what AMPs are flowing out of the battery when
everything is switched off. You may need to read the manual with your meter to
see how to connect this or even if your meter is suitable. But would be in
line between one terminal and the lead, not across the two battery terminals.
There may be legitimate drains on the battery. e.g. a car alarm or an interior
light on. I have had a failed light switch before so the boot light was on all
the time. I traced it that way.
If you are checking the battery the first way is really the business. That
way you can really confirm it's OK. Alternatively your can take it to a
specialist who will test it under load and see if it is weak. The second way
is more for car fault finding.
Derek
On 24 May 2010, at 20:39, Susan and Martin Scott wrote:
I've now had a second battery replacement, and have therefore come to the
conclusion that it may not be a fault with the battery. The last time it
drained to nothing in 2 days (and it was absolutely nothing, not even enough to
light an LED!). I immediately detached the terminals and found there was no
resistance - indicating nothing in circuit?
Although I'm confident with simple circuits, I'm the first to admit that
electronics is beyond my brain power................. I set about some
detective work today
Findings 1. With meter set on ohms, I get no reading across the battery
terminals when disconnected from the battery and nothing in circuit.
2. With the battery terminals connected and the engine running the
voltage across the terminals is 13.7V
3. Without the engine running the voltage across the battery is 12.6V
4. With the battery terminals disconnected and the meter set to 2V, I
found there was a voltage of 0.048V when the meter was connected, which reduced
to level out at 0.015V. It didn't seem to matter when the meter was connected
ie If I measured across the terminals 3 Sec after disconnecting from the
battery it was the same as if I waited 2 minutes, and also the drop once the
meter was put across was delayed if interrupted eg . 0.048 then watch it drop
to 0.030, remove meter for 5 seconds, reconnect meter and the reading was
0.030, then dropped further.
5. Having removed all the fuses, the same occurs.
The alarm fuses have been disconnected as well, but I don't think it
has a battery in it.
6. Connecting the meter between the engine block and the positive
battery terminal measures a lower voltage 0.028V, which drops to the same 0.015V
Is it maybe electrolytic reaction within the block? As I say I'm not into
electronics.
Why is there no measured resistance, but the battery drains?
Any ideas gratefully received.
Martin
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