The battery on my late 2010 TDV8 Sport (August 2010 build) is about to die. It doesn't hold voltage.
The first battery was replaced about 1.5 years ago under warranty (3 years old) when it died and now the replacement unit is on its way out.

I have another 4 months left on warranty so I think Landrover will be replacing the second battery under warranty.

How long should a battery last in a RRS. Less than 3 years does not sound very good to me and less than 2 years definitely not.

Alternator healthy and kicking out >14V? Visitor from fullfatrr.com
* GONE. 2012 RR Sport HSE SDV6 Orkney Grey. Now being piloted by RRSTDV8
* GONE: 2011 4.4 TDV8 Full Fat. Amazing piece of kit.
* Current. 1974 Lightweight 2.25L petrol. Old skool
* GONE. Freelander GS TD4 Manual MY2013. Orkney Grey with privacy, cold and clearview packs, armrests (a must!) and a spoiler.
* GONE. Range Rover Classic '93 200Tdi Factory fit
* 1949 80" in family since 1975

My current battery is just over 8 years old and still running OK.

Garry 07MY RRS TDV6
Arctic Frost
Aspen Interior

Could be a coincidence but later models with BMS (Battery Monitoring System, which came in about 2010 I think) appear to have lower battery lives. My 2011 RRS original battery only lasted 2.5 years and was replaced under warranty.
Regards
Barry 2017 Range Rover Sport TDV6 L494 SE Fuji White
2011 Range Rover Sport SDV6 L320 SE Fuji White Loved but GONE
2010 TRAKKA Motorhome Fiat Ducato GONE (What a dud, don't buy one)
2006 Discovery 3 SE TDV6 Automatic Chawton White/Ebony. Loved but GONE
2006 BMW X5 diesel White/Charcoal, Bought new, Gone after 12 years! Was Excellent.
Ex Member Range Rover Club NSW

Mine lasted 4 years, 20,000 miles.

Now I am wondering if mine should have been replaced under warranty! L405 P400e Autobiography (MY2020)... Silicon Silver / Espresso
RRS TDV6 HSE Lux (MY2011)... Nara Bronze / Arabica - now gone!

My TDV8 has had batteries at:

March 07 (when new)
Nov 11 (lasted 4.5 years)
July 15 (lasted 3.5 years)

One alternator at:

Aug 14 (lasted 7.5 years)

Not bad in comparison