Whilst experiencing longer spells of not being used so much in recent months, our 3.0 TDv6 has regularly displayed the low battery warning. Despite intermittent CTEK top ups, it tended to revert to the low battery warning after a couple of weeks.

Anyhoo, with 3 days left before policy renewal was due, a call to RAC (the car hadn’t broken down) resulted in a technician at the door within the hour. No problem found with the alternator so the chap decided to fit a new battery FOC because the policy covers that. Great service.

A week later and the low battery warning is back on and the tailgate isn’t opening properly

RAC Battery Test (resulting in replacement):
Battery Manufacturer: EXIDE
Rating of battery tested: 850EN Chemistry of battery tested: AGMFLAT Rated Ah of battery tested: 90
Smart charge: Yes
Battery test results
Temperature: 10°C
Measured voltage: 12.07Volts Measured rating: 552EN
Reserve capacity: Good Reserve State of health: 100%
State of charge: 28%
Test Result: Serviceable Recharge System test
Jump pack used:No
Starter Avg voltage: 11.03Volts
Starter Avg current: 107.4Amps Starter result decision: Normal Alternator voltage (unloaded): 0Volts Alternator voltage (loaded): 14.38Volts Alternator current (unloaded): 0Amps Alternator current (loaded): 11.6Amps Diode decision: Normal
Alternator test decision: Normal
First drain test voltage: 12.07Volts First drain test current: 0.9Amps Second drain test voltage: 12.03Volts Second drain test current: 0.4Amps

Do you just have 1 battery ?

in theory if Ryan does have a secondary battery it shouldnt affect anything if its flat or disconnected [if you dont want the stop/start]..

unless theres a circuit that shows the state of the connected secondary battery in the dash menu.. ... - .- -.




Y. O. L. O.
.

Second battery is for critical electronics. Easy to access and check its state.

It depends which one the RAC changed

RAC changed the main battery with the same type as was in before. Chap didn’t know owt about RRs... yours truly had to take the spare wheel out to show him where the battery was... poor lad would have been in the engine bay all night otherwise

So the RAC didn't interrogate the car and tell the car the battery has been changed no?

I put a new battery in my XFR earlier this year and was experiencing the same symptoms are you are afterwards.

I needed to reset the Battery Monitoring System (BMS) after fitting the new battery. Shortly afterwards the 2nd battery failed so had to do the same again after replacing that. Ever since my BMS was reset, I’ve not had any other issues.

The L405’s are the same I believe. Thankfully, once I’d registered it, by IID tool worked on the XFR so it was easy enough to do.

David. 2002 4.6 Vogue SE - Alveston Red with Lightstone Leather
2012 Range Rover 5.0 SC Autobiography in Indus Silver with Jet/Ivory Interior
2012 Range Rover 4.4 TDV8 Autobiography in Baltic Blue with Sand Interior

Problem might now be resolved. The RAC wasn’t able to reconfigure because their equipment didn’t recognise up to 2015MY L405s. Called RAC back yesterday and the technician played about a bit with his “RAC Scan” and managed to do the reconfiguration by telling his kit that it was reconfiguring a 2017 RRS. This is what the job sheet says:
“Reconfigured battery parameters via 2017 Range Rover sport option on RACscan.”

All seems to be working as it should now... and it’s going into main dealer for a service this week anyway so any issues with what the RAC has done and they can sort them.