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Recommended Battery

mikegibson

mikegibson

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I am going to replace the AGM battery (not Lithium) in my 992. It's a standard 70AH/720A Banner battery fitted from new and at 6 years old it's life is coming to an end.

Has anyone replaced an AGM battery in their car with a non-dealer fitted item? I can get a Banner for c£160 but I suspect there are better quality batteries for similar money.

I haven't yet asked my OPC how much they charge for a replacement and will do so for the laugh.
 
If you have a Porsche extended warranty you will need a Porsche item to maintain the warranty. If not a Bosch S4 or S5 should be fine but it will need coding to the car to optimise the charging criteria.
 
Coding was going to be my next question. Does anyone have any experience of “coding” a non-OEM battery on new Porsches. The more I look at this the more I am dissuaded from doing this simple job myself.
As far as I can determine, the car requires a thing called a BEM code to be programmed (as well as make and Ah of battery). No “off the shelf” battery will have a Porsche BEM code as far as I can tell (my original battery does not have a sticker with the code on either). Urban legend is that the BEM code tells the battery management s/w what “map” to use for optimal charging etc. Apparently, VAG group cars don’t automatically learn/adapt to the battery (unlike many other brands).

Anyone have any actual experience of swapping out the original battery?

Thanks
 
Plenty of youtube videos out there on swapping batteries on Porsches. You'll need something like an iCarsoft diagnostic tool to code the battery. Pretty simple to do however, you will need the codes off the battery to allow the BEM to adjust the charging voltage for a new battery. You'll also need to buy a battery for stop/start vehicles. Not sure where you can get one for £160 as the cheapest I've seen is c.£350. If you buy from Porsche and get them to fit it they'll charge you in the region of £7-800 for the battery and fitting.

Where in the UK are you Mike? Someone close to you may have an iCarsoft or access to something similar that can help you.

Dan
 
Thanks for your reply Dan. I can source a Banner battery (same spec as original in terms of Ah and cold-crank A) from Tanya for £160 so the part number of the existing porsche Battery will suffice for coding/registration. Thought it probably easier to stick with exiting manufacturer than change. The only “issue” is that when sourced this way it lacks the mysterious BEM code. Having watched many videos on YouTube it is evident that all I need to code the battery is the Ah, Type (AGM), part no (I’ll use existing) and a serial no. My outstanding challenge, as you say, is finding a device to do the coding. TBH I am “struggling” to find a definitive answer to the question of which Foxwell, Icarsoft etc scanners will do a battery reset on a 992. I have found evidence of those models that don’t work but most of the manufacturer websites are pretty poor at providing compatibility info. I am now thinking that it’ll be less agro to source the battery and use an independent to install and code.
 
For coding the battery, suggest speak to a local garage to see if they'll do it for small charge - ours did the neighbours for under £20.

For alternative battery, Bosch S5A range are AGM start stop batteries and quick web search for 992 says Bosch S5A11 (80AH/800A) around £140 - £150.
 
marc_tt said:
For coding the battery, suggest speak to a local garage to see if they'll do it for small charge - ours did the neighbours for under £20.

For alternative battery, Bosch S5A range are AGM start stop batteries and quick web search for 992 says Bosch S5A11 (80AH/800A) around £140 - £150.
Click to expand...
I am tempted by the S5A but as the characteristics are different to the original I would not know what info to put into the Part No field. It is still very unclear to me whether the car actually needs to know anything more than the capacity and type (AGM). I strongly suspect that the other data required is simply there to make owners use OPCs for fear of pitting wrong info into the Coding. I totally get that the car wants to know it’s a new battery and can see why it needs to know the technology (AGM vs Wet etc) but does it really need to know the part number and serial no - I doubt it.
 
For peace of mind, suggest call a Porsche Indie and your local garage and ask their advice on coding.

I've done other cars and on those it showed the original battery data and just re-entered this when battery was same type (i.e. AGM) and capacity. Re-entered the data to tell the car it was a new battery - change the serial number by a digit.

Also, changed AGM start stop battery on VW and forgot to do coding and remembered 18 months later, and it worked and charged fine regardless.
 
Last edited:
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The reason for the battery code is to allow the car to see the new battery and provide the appropriate charge. If you have a tired battery and the alternator is giving more charge then adding a brand new battery without coding may result in the new battery being damaged. May be smoke and mirrors but it were me I'd rather have a battery in good health. If someone on here has a good battery from the same model and year you could always ask if you could use their codes.

Dan
 
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