Charging Car’s Stop-Start Battery

My Berlingo battery is dead flat this morning after the car sitting on the drive for 6 weeks. The battery is dead dead and couldn’t jump start it this morning…I suspect the battery needs replacing but am going to give it a charge.

I’ve noticed that most battery chargers say that they are unsuitable for batteries that are specced for stop-start and my berlingo has this function…

I don’t really understand…what is the difference between a stop/start battery and a normal one in terms of charging it?

R

The three letter acronyms (EFB and AGM) mean a smart charger is needed. Constant charge from a less smart charger causes problems

Could also be referring to support batteries.

Does it have more than one battery? Our V70 had a hidden AGM battery for stop start and a big starter battery. I bought a charger in lockdown and it is smart enough to know what battery you have it plugged into and how to best charge it.

Just a thought, you’ll probably find a BF deal, e.g. CTEK CT5 on Amazon if that suits

A word of warning if buying a smart charger for this.  Not all of them will charge a completely dead battery. I borrowed a CTEK from work when mine died and it wouldn’t do it. I had to hook it up to a dumb charger for a few hours to get some volts showing, then the CTEK worked & went through its repair cycle.

Oo oo, please Sir, may I ask a supplementary question?

I understand the big battery does the stop/start and the little battery keeps things (systems) going during stop/start. When the ‘stop/start battery needs maintenance’ warning comes up (cos its been stood for weeks),  it’s actually (usually) the big battery that’s fcked even though we think of the little battery as the stop/start one.

Does that make sense?