Peugeot 308 starting problems

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BiL's Peugeot 308 has a starting issue. More often than not on switching on the ignition he gets a full set of warning lights on and remaining on including the ones that normally go off after a period. Also the car does regularly flatten the battery for no reason.

Car had a new battery last year to solve the then problem with starting - at the time that battery was the age of the car - 10 years. Not sure if the Battery should be 'coded' to the car or not; int doesn't have start/stop feature.

I have found out today that he charged the battery several times with the battery still connected to the car. I discovered that as I asked him to disconnect the battery for a couple of days before I go and look at it. Apparently one of the battery posts cannot be undone...

Unfortunately he hasn't been doing much mileage recently and less 'cause of the starting issue.

He now does not trust the car to start if he goes out in it.

Any thoughts on what I should investigate, please.
 
BiL's Peugeot 308 has a starting issue. More often than not on switching on the ignition he gets a full set of warning lights on and remaining on including the ones that normally go off after a period. Also the car does regularly flatten the battery for no reason.

That might suggest a drowned ECU..

I have found out today that he charged the battery several times with the battery still connected to the car. I discovered that as I asked him to disconnect the battery for a couple of days before I go and look at it. Apparently one of the battery posts cannot be undone...

That depends upon the charger - is a coverall instruction to disconnect the battery, when charging. With a modern, voltage controlled charger, it is not necessary.

Any thoughts on what I should investigate, please.

Start with the ECU..
 
1st thing I'd do is read the codes, delete them and then see what returns.

2nd thing, or actually the very 1st is make sure its the right battery and type for the car.
 
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