Hi,

I have a new Yuasa YBX7027 battery for my 2017/67 Skoda Fabia. It's surprisingly still on the original Exide EFB 59AH battery but it's starting to get less efficient. My car as usual has the battery management system (BMS) with stop/start and my vehicle requires a new battery to be registered with a diagnostic tool. I've been looking at videos and things online and Carista seems to recommended.

Has anyone else with a Skoda vehicle of my generation or another VAG car such as a VW, Audi or Seat fitted and coded a Yuasa battery? using Carista? This battery is a 65ah EFB stop/start type and it's serial number starts with "YI" followed by some numbers.

Good morning, take a look at a post @peter3197 put up in March 2021 'Idiots guide to coding for new battery' - The post was for VCDS but should point you in right direction.

Important data to change is the new battery capacity, type (if changed) - and new serial number (which can simply be a change to the last digit of the original number)

I don't now about Carista but the data input will be the same for all. Below is a cut and paste from an earlier post in another thread.

The important things are to change the "serial number" often from VWŠkoda factory this will be ten ones (1111111111) so you can just increase to 1111111112. The type of battery, EFB or AGM (VW being VW call AGM "fleece") and make sure you put in the correct Ah. As you will se in my example below the three character manufacturer code is unimportant, I ignored it, but if you want three characters you can just leave what's in there already (or retype same if required)

Below is from when a Briskoda member used his OBDEleven, 4 years ago, to 'code' the battery change on my wife's Fabia Mk3.

As another example I've attached Varoom's notes for VCDS. - VCDS How to adapt a new battery.pdf

Thinking of VCDS you might find another Briskoda near you with VCDS that could 'code' your battery for you for a beer token. See the map post and map here for details. - https://www.briskoda.net/forums/topic/262215-list-of-vcds-owners-previously-known-as-vag-com-vcp-owners/#comment-3091029

With your new battery if you also do preventative recharges it to full using an appropriate battery charger maintainer and following the instructions in the car's 'owner's Manual' and for charger maintainer then this battery might last even longer than the previous (which might possibly outlast the car). Aldi do a £15 charger maintainer that's fine and it is/was(?) on special offer at £10, or for a bit more the update of the one I use for my wife's 2015 Fabia, Ring 904. - https://shop.ringautomotive.com/rsc904-4a-smart-battery-charger-maintainer.html

HTH.

Edited 30 September, 202530 Sep by nta16

10 hours ago, nta16 said:

Aldi do a £15 charger maintainer that's fine and it is/was(?) on special offer at £10

My mistake it's Lidl, I always confuse the two, Ultimate Speed Car & Motorcycle Battery Charger, £9.99 (instead of usual £14.99) and these chargers work fine as many have found out, a neighbour still uses a previous model that he got from at least before 2019. - https://www.lidl.co.uk/p/ultimate-speed-car-motorcycle-battery-charger/p10036322

Nigel

Just tried your link and it's not working.

Tried searching for battery charger and it only give results for Parkside tools ☹️

Dave (O)

Dave, I tried and the link doesn't work now sorry, the advertising of the offer must have finished I guess but some might still be on the shelves perhaps but I don't know as I've been to an Aldi so few times.

Lidl built a shop very close to where we live so I go there, I'm not a shop goer though. However it does mean I know Parkside brand is from Lidl (not Aldi). I don't know what brands for tools Aldi now use but having used a (very) few tools from Lidl and one my neighbour bought from Aldi I find those ones at least to be very good and good value. I've been using a set of extendable garden loppers that my neighbour bought from Aldi for a couple of seasons now and given them use beyond their specification and they continue working fine, at the price he paid for them they have already returned the investment in them.

As an alternative you could look at the up dated version of the charger I use on my my wife's 2015 Fabia (60Ah AGM) battery if you shop around you can get it at a lower price than direct from Ring if you want. I got mine (RSC804) at a lower price off an eBay provider, I dislike Amazon and usually (not always) find I can get the same products for a lower price on eBay than Amazon.

https://shop.ringautomotive.com/rsc904-4a-smart-battery-charger-maintainer.html

Obviously other products and providers are available.

Ring RSC804 in use on a cold winter's night. -

Edited 3 October, 20253 Oct by nta16

I now have a Carista Evo dongle (great little obd2 device). I've accessed the BMS and the information currently held for the Exide 59ah EFB battery is as follows:

Battery capacity: 59ah

Battery technology: EFB

Battery manufacturer: JCB

Serial Number: 1111111111

The new Yuasa battery is 65ah and Carista can set that, the technology is EFB so that'll be left unchanged, what do you enter as the 3 digit vendor code as this is an aftermarket battery and what about the serial number. The Yuasa has a serial number which begins YI with 9 numbers so is 11 digits not 10?

I bought and recoded the same replacement battery for my 2015 Fabia 3 last year. Change 59 to 65 and 1111111111 to 1111111112. Leave EFB and JCB unchanged.

Edited 7 November, 20257 Nov by DGW

@DGW How has your Fabia Mk3 been with this Yuasa battery, has everything functioned as normal after installation and coding, no warning lights, stop/start working as normal etc. ?

Yes.

On 06/11/2025 at 23:57, wilson-uk-85 said:

The new Yuasa battery is 65ah and Carista can set that, the technology is EFB so that'll be left unchanged, what do you enter as the 3 digit vendor code as this is an aftermarket battery and what about the serial number. The Yuasa has a serial number which begins YI with 9 numbers so is 11 digits not 10?

Don't worry about it it was just for VW statistics you can leave it as JCB - or if you want to change it then have a search for if VW had a code for Yuasa, someone somewhere on this site put a list of codes but this is all outdated legacy VW stuff (bit like some of the computer parts and programming on VW cars I think).

By the fact that the serial number was entered at factory as ten ones (1111111111) shows the system was outdated even at that point of use, the Covid chip shortage highlighted how cheap and old (European) mainstream car manufacturers computer systems can be, probably why the old car manufacturers will disappear or just be a name badge when taken over or merged in with the new Chinese manufacturers.