Warrior193

But OP was asking if code required for infotainment when disconnecting battery to change it - not about replacing radio.

My understanding is that there is no code for the user to input - the MIB infotainment system is protection coded to the vehicle using non-volatile memory. The only thing that may be lost when disconnecting the battery is radio station pre-sets.

As the commutator uses sliprings, it's little difficult for me to see how the alternator can be generating such interference while appearing to output correctly - Is there a smoothing capacitor anywhere in the alternator circuitry?

With the engine running, what voltage are you seeing at the battery terminals?

Hello, welcome to the forum. I'd go with your first suspicion of the battery sensor being faulty - minus 40 degrees clearly looks wrong and I cannot see an alternator fault causing that. Try replacing that first, likely not expensive and an easy DIY.

Quite interesting that the cam sprocket appears to have failed at the drilled hole - does that hole correspond to any locking device?

Thanks, was there any significant damage to the pistons?

Presume the DSG is a wet clutch - Is there going to be a manual version?

That would appear to be unusually incompetent - even for a Stealer!

Definitely does not sound right to me - did you ask the dealer about this module being left in transport mode?

Try a DIY load test, first ensure battery is showing a reasonably high SOC, with the multimeter probes on the battery terminals get someone to crank the engine on the starter and note what the voltage drops to.

Hello, was the head and cam work a modification - or result of wear/damage?

Back EMF of the cell is what is limiting the charge rate - even a fully discharged L.A battery has a voltage of around 11.0 volts. Increased internal resistance is one of the enemies of secondary cells as it limits the available current in both directions - the other main problem is hard sulfation which reduces available reactive plate material and is caused by persistent low SOC. IMO this is where there may be an issue with the BCM limiting the alternator charging to around 75% in micro-hybrids (stop/start)

A secondary battery (E.g L.A, NiCad, LiPo etc ) is one that can be recharged by reversing the chemical process - as opposed to a Primary battery ('dry' cell) where the process is non-reversable.

A common misconception to think of a secondary battery as 'an energy store' - it is more accurate to think of them as being a generator of DC current using a reversable chemical process.

Possibly it was serviced at an independent garage with no access to electronic service records - the inspection should give some indication if servicing has been neglected.

Probably no difference, does the inspection scope of both look similar?

Is it dealer or private sale? Does it have service history?

Hello, definitely worth having the inspection IMO.

Just a thought - has there been any LED type bulbs fitted recently?

That charger should be fine for your use, I use a larger Ring RSC608 for my Octavia. Very possible that your battery will not recover much after such a deep discharge.

Sudden battery failure is a frequent occurrence when the battery reaches end of life - especially if it has been giving some indications of weakness lately. Often happens with a sudden drop in temperature. Regular 5-mile trips are almost certainly not sufficient to maintain battery charge. Are you certain nothing was left switched on? At 2013, this vehicle is presumably not auto stop-start - is that correct?

+3 for manual, did not like the DSG when I was shopping for current Octavia - quite liked the TC boxed Passat I drove in Ontario, especially when using in manual mode. If the DSG manual mode was reversed so that it was similar to sequential, perhaps.

@Noda , have you resolved your problem?

Hello, welcome to the forum. Any random faults caused by battery disconnection and reconnection should clear themselves after taking the vehicle for a short drive. Did you carry out the battery adaptation (coding) after fitting the new battery?