I was told by a LR technician that the L494 has 3 batteries.The one in the rear drivers side compartment is for the stop/start.

Andy Andy.
21 Ford Ranger
Gone but not forgotten
Focus RS Red Edition
2015 RRS AB Fuji.
2014 RRS SC Santorini
2016 VW Amarok
2014 RRS AB Fuji
2012 RRS Red Edition Fuji
2015 Nissan Navara
2012 RRS SE Santorini
2008 RRS White
2007 RRS Santorino

I wonder where the third one is. I disliked stop start in my RRS at first but now have no problem with it. In fact when I get in a car without it I miss it a bit. Just give it a month or two and you'll hopefully get used to it. RRS P460e
1983 2 door Range Rover ARB Bar X9000 winch ARB Rear Bar now semi retired.
Many big trips done in this one.
1982 Rangerover nearly restored.
22 Defender D250 with lots of stuff for outback touring
Nice 2013 Freelander TD4 manual (for daughter to learn on) with much better stereo compared with previous SD4 SE with Meridian which sounded bad!
2013 Land Rover Defender ute.

Stop/start stopped working on my car after 6 months as the batteries degrade and the car can't charge them up to the 100%, despite doing 16k miles a year. If I put the battery on a conditioner over the weekend stop/start will work for 5 days. I don't know whether it is just a crap battery or the fact I have the 1700W Meridan system.

I miss it. I like the way it works. 

Hate it, always have. MY2016 HSE D SDV6 - gone due to fuel dilution problems.

By the age of 50 you have the face you deserve - George Orwell.

philmw wrote:

Stop/start stopped working on my car after 6 months as the batteries degrade and the car can't charge them up to the 100%, despite doing 16k miles a year. If I put the battery on a conditioner over the weekend stop/start will work for 5 days. I don't know whether it is just a crap battery or the fact I have the 1700W Meridan system.

I miss it. I like the way it works.

The first thing I used to do after getting in the car was to disable auto stop/start. After reading here some members praising it I decided to give it a second chance and happy to admit I was wrong. It does work very well indeed and because I leave my car on a maintenance charger on weekdays when not in use, it always kicks in as soon as the engine temperature is sufficiently high. I like how I can put my foot on the brake lightly when I know I will be off soon and don't want the engine to stop. Only a firm press of the brake pedal stops it. And ignition turning off when seatbelt is unbuckled - great. Current: Volvo XC90 T8 Inscription Pro PHEV with some optionals on top
Gone: MY16 RRS2 3.0 SDV6 Autobiography Dynamic, Carpathian Grey & Santorini Black Sliding Pano/Ebony & Ivory 2 Tone
Gone: MY13 RRS 3.0 SDV6 HSE Black Edition, Orkney Grey/Ivory
Gone: MY09 RRS 2.7 TDV6 HSE, Santorini Black/Almond

Do you have to charge this battery separately? i.e. are both (or all three) batteries electrically isolated?

I assume the batteries are connected even when the power management shuts things down as I connect the conditioner to the point in the engine bay and it manages to recover the stop/start, which I believe is handled from the small battery in the back. 

That makes sense, but how then is one particular battery operating a specific function (such as stop-start)? If they are connected in parallel, why wouldn't the batteries share the load?

You need to charge from engine bay,their is a positive pole & a negative.techys told me not to couple charger straight to battery in boot.

Andy. Andy.
21 Ford Ranger
Gone but not forgotten
Focus RS Red Edition
2015 RRS AB Fuji.
2014 RRS SC Santorini
2016 VW Amarok
2014 RRS AB Fuji
2012 RRS Red Edition Fuji
2015 Nissan Navara
2012 RRS SE Santorini
2008 RRS White
2007 RRS Santorino

Yes, so I gather - but that implies that the batteries are connected in parallel otherwise they wouldn't both (or all, if there are three) charge. The logic I was querying is how the batteries are, at the same time, isolated when it comes to supplying a load. I'm guessing there must be a diode or equivalent that only lets current flow one way in the charging circuit to each battery.

I have fitted a CTEK Comfort Connector to the fuse box in the boot and trickle charge from my CTEK through that. It takes care of everything like ensuring stop/start, remote park heating etc. can stay operational so the batteries must be linked somehow. I assume the maintenance charger that LR provide as an optional extra (which speaks volumes about unsuitability of standard supplied batteries' capacity but that's a separate topic) uses a similar setup internally but is obviously neater than my DIY job. Current: Volvo XC90 T8 Inscription Pro PHEV with some optionals on top
Gone: MY16 RRS2 3.0 SDV6 Autobiography Dynamic, Carpathian Grey & Santorini Black Sliding Pano/Ebony & Ivory 2 Tone
Gone: MY13 RRS 3.0 SDV6 HSE Black Edition, Orkney Grey/Ivory
Gone: MY09 RRS 2.7 TDV6 HSE, Santorini Black/Almond

I have the same, or similar, kit, and was pondering where to connect it. (I don't get the car until 1 March). The so-called Land Rover conditioner is an old model Ctek re-badged, judging by the picture in the Configurator, and just comes with a cigarette lighter adapter also judging from the picture (despite some forum members saying they've been told not to use the lighter socket to charge the battery!). They used to have a connector which fitted in the windscreen wiper well. At £178, it's a tad more expensive than the £39 I paid for the same piece of kit! (Typical JLR mark-up!). Since then, I've bought a much better version (MXS 5.0) which came with a multitude of accessories and coupling cables, as well as a 'comfort connector' with its own built-in battery condition monitor, all for £61.95 inc. delivery!

I paid more than £61.95 for mine but then it is an MXS 10 which charges faster and also has the 'supply mode'. Still it was a lot cheaper than £178 (don't remember the exact price). Current: Volvo XC90 T8 Inscription Pro PHEV with some optionals on top
Gone: MY16 RRS2 3.0 SDV6 Autobiography Dynamic, Carpathian Grey & Santorini Black Sliding Pano/Ebony & Ivory 2 Tone
Gone: MY13 RRS 3.0 SDV6 HSE Black Edition, Orkney Grey/Ivory
Gone: MY09 RRS 2.7 TDV6 HSE, Santorini Black/Almond

What does 'supply mode' do? (I apologise to other readers that we've wandered off topic!).