Seat Leon. Battery flat.

You've not had 3 knackered batteries, you car has knackered the 3 batteries imho.

I saw a car where the alternator would sink the battery to ground, disconnect the alternator and leave overnight to test that one.
 
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I can understand first bsttery being bad as it lasted a week in April.. replace it with a different one at thst time and has lasted over 8 months ...until now so if something was draining the bsttety would have done ages ago..not now..cud be intermittent fault somewhere or maybe this bsttery is also no good..will try third bsttery , guy at shop gonna check bsttery tomorrow..if it is faulty he will replace if not then, need to get it checked out by car electrican
 
Warning light flashing points to worn brushes on the alternator, if stop/start then stop now, as you need a computer to work out what is wrong. But if not then engine running slightly over tick over and should show 13.4 to 14.4 volts, yes seems a big gap, but some alternators have stage charging, but normal is 13.8 volt.

We had a problem selling sealed batteries, we had to charge them before they would be replaced, and even then we could not see the electrolyte, if over charged it goes reddish colour, so once returned to manufacturer they would soon know if failure down to abuse, and so we could end up replacing a battery and then being refused replacement by manufacturer, so if under 12.4 volt then we assumed abuse, and would only replace if manufacturer refunded us. I think that was wrong, but I was not the boss.

Manchester batteries would always replace, now Tayna, so we would always replace to customer, more well known makes we had problems with, it seems motorist shops had been replacing batteries without question, so the manufacturers tightened down.

The warranty at that time required us to fit the battery and enter vehicle details, taxi's only had 6 months warranty, not a clue why, so if we had fitted it, we should have checked charging, but we did sell without fitting so did not always check charging, today with stop/start not sure how shops could check charging? It needs a PC plugging in.

Off car charging needs to be with a smart charger, and most need at least 8 volt to start charging a 12 volt battery, under that it assumes a 6 volt battery is being charged, so with the smart charger I have had to cheat, and connect two batteries in parallel to get charger to work.

My Honda Jazz had a battery which would only last 3 weeks without use, it was clearly faulty for last two years, in September it decided to fail completely, but I had been given loads of warning. And normally you do get some warning battery on the way out, not the same with alternator, they tend to work one day and not the next.

Also we get the lazy starter, in the main that means bearing have warn, so if engine warm and easy to turn over works fine, but if engine is cold then the extra power causes the armature to bend slightly and catch on the pole shoes, it can be miss leading as often a jump start will turn engine over OK, so people assume battery US but really it is the starter.
 
OK.. guys just an update..I think I found out what the problem was...it was the the standard car stereo draining the battery..I took it out and removed the power from it...2 weeks on so far so good..battery is fine car starts ok...just need to get a replacement stereo...
 
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anywhere where i can get the radio code for a replacement stereo ?..gonna be the same type of unit..ta
 
Plenty of firms on the web will give you a code so long as you can give them the numbers written on the side of the set - costs around £20 the last time I needed one.
John :)
 
A few years ago I had a similar problem. Battery flat in the morning on numerous occasions. Then a neighbour knocked at the door at 11pm one night and asked me if I knew I'd left the radio on! My radio goes off when the car door is opened but it was then randomly coming back on in the night. Problem cured by me actually pressing the off button when exiting the car!
 
Just an update...battery gone flat again.. ☹. Car is fine without stereo connected, put new stereo in battery gone flat..after a few days..
 
No just standard basic car radio..no cd player in boot...this one here..
 

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