I bought a new AGM start/stop battery a few months back after my old one started failing to start/stop more often than not and at 6 years old decided may as well change it out. All then seemed to work fine but as a retired couple we go travelling now for a month and upon our return I found the battery dead flat. Recharged it fully with a quality charger and popped it into the local Kwik Fit to have a free battery check. The new battery checked out fine and again no problem with start/Stop but just returned from a 4 week trip to find it flat again. Any ideas from my learned friends out there? Thanks

Did you deadlock the car ? (twice press the lock button). Cars can seek equipment like mobile phones on Bluetooth when not fully locked

Land Rover specify in the workshop manual a stock car needs a battery charge every 30 days. FL2 MY10 TD4 GS traded in at 2 years
FL2 MY13 TD4 GS Current

4 weeks is asking a bit much,dissconnect the battery before you go,and leave the brake off or it might stick on,i get this a lot doing roadside rescue.discharge should be no more than 0.4 amps,with a 70 amp hr battery some clever chappy on here can work out how long at that discharge rate before the battery gets below 11.5 volts,causing non start.

So did you deadlock ? FL2 MY10 TD4 GS traded in at 2 years
FL2 MY13 TD4 GS Current

Yes deadlock it.another Bob from Yorkshire .

If you are going to leave the car unused for weeks/months on end your best bet is to invest in a C TECK battery conditioner

 FL2 MY10 TD4 GS traded in at 2 years
FL2 MY13 TD4 GS Current

Jack frost wrote:

If you are going to leave the car unused for weeks/months on end your best bet is to invest in a C TECK battery conditioner

Had battery problems since getting this car. Warnings on screen, to not sufficient juice to even turn the engine over.
Been in main dealers for overnight testing on two occasions. Had battery checked over at national firm and passed with flying colours. Invested in a CTEK charger just to keep it topped up. Now my confidence is so low on this that I am thinking of investing in a Britpart X5 PowerPack. Having had to get people out to jump the car at Manchester Airport on two occasions, it's getting beyond a joke. Going away soon for 18 days so already worrying. What experience have other users had of powerPacks?
Yes I do double click on locking. One Discovery, gone
Now on third Freelander 2
2013 HSE Auto Orkney Grey

You don't give enough detail in your description of how severe the drain is for example close car at night and next morning it won't start. You say you've had no battery power to start in the mornings, was that from overnight or days parked?
Try pulling the MOST reset pin in the RJB and leave it out until starting again. This will effectively shut down the entire Infotainment system ecu's which is what the FCDIM (front touchscreen/infotainment gateway module) should do especially if deadlocked.
If you find your having no issues whilst doing this then I suggest you have a faulty FCDIM which is not shutting down/placing infotainment system in sleep mode which is a major draw of power.
If the problem continues then you need to look at other systems but I would say this is the most likely explanation.
Try that. MY15
Tyre Pressure Monitoring System (TPMS)
Surround Camera System
InControl Apps soon to be replaced with CarPlay (WIP)
Meridian Premium Surround Sound
Digital Audio Broadcast
Timed Climate
Cruise ECO Data
Follow Me Home Reverse
Extra Features Menu
Picture In Motion
4x4i screen (WIP)
Digital Broadcast TV
Meridian Rear Media with WIFI
Factory Powered Tailgate
Blind Spot Monitoring (BSM)
Reverse Cross Traffic Alert (RCTA)
Electrochromatic Wing Mirrors (WIP)

I got a power pack from Costco wouldn't be without it so handy for tyre pressures and I've helped 3 people out with flat batteries it's never failed.

Hi Stuartc
Thanks for your interest and suggestions. Not being particularly up with technical terms, could please advise what a reset pin in RJB is? I will then try it.
Battery drains when left over days. But last week after getting car out of the garage and washing it, it would not turn engine over. Charged it up overnight and no problem starting.
Having had this car in the main dealers on two occasions, would they or should they have the appropriate equipment to isolate this. They have had it in over 2 or 3 days to source the problem.
Would this be covered under LandRover Extended Warranty? One Discovery, gone
Now on third Freelander 2
2013 HSE Auto Orkney Grey

Ok, battery flat overnight again. Have arranged to get this sorted (hopefully) by the local dealership (again).
Going away later this month, so they can have it till the problem is sorted.
Apparently covered under extended warranty.
Will update on my return. One Discovery, gone
Now on third Freelander 2
2013 HSE Auto Orkney Grey

Have you got an electronic anti rust device.

LR tried to flog one of these off to me for the new car. I knew about them from the 1980s & the scam that they don't work. Could not believe this rubbish is still being pushed onto unsuspecting buyers! It has a small but constant drain on the battery! Procrastination, mankind's greatest labour saving device!

Acoustic insulation ARB TPMS 3xARB air compressors After cooler Air tank On-board OCD pressure air/water cleaning Additional 50L fuel Carpet in doors ABE 2x1kg Waeco 28L modified fridge Battery 4x26ah Solar 120w Victron MPPT 100/20 DC-DC 18amps 175amp jumper plug Awning 6x255/60R18

It's not a cure and I can't say they work or not. Anyone tried them?

http://www.halfords.com/workshop-tools/gar...ner-12v-6w