Story - bought 2005 RR back in 2022. The previous owner put a new battery from Walmart - EverStart H9, 950 CCA 3 month earlier. Year and half after purchase, beginning of 2024 battery died. Took it back to walmart and they replaced under warranty (they have 3 year warranty) and put new. This was Feb 2024.

This April left for extended overseas trip for 40 days. Car was parked in on a street. Upon return battery is dead. Called AAA, they came, jump started it but I could tell that something was off already based on how slow starting was. Took today back to walmart for test, yep - dead.

Supervisor at walmart did replace this time under warranty as well, and now they put EverStart Platinum AGM battery but told me that this was last replacement - if something goes wrong, I have to buy a new battery.

So my question is - what might be something there that causes battery to be dead after a year?

Well, expect the assumption that walmart batteries are crap?

I would hazard a guess that Walmart batteries are built to a price...

If it goes again then IMHO, buy a branded battery or try the dealer for an original one, here the dealers are pretty competitive on the price of batteries...  Pete
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2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand Sold
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Sold
2002 L322 Vogue 4.4 V8 Epson Green (Fatty Offroader) Sold
-Click for Project Fatty off roader-

Well, the price of battery was $190. The new AGM one they put is $210. Local dealer happily will offer you battery for $600. That most likely was made by elves in moonlight and blessed with milk of unicorns...

I am putting 750ma/12v trickle charger now every time I park it for more than 12h.

So I my experience is that if you dont lock the car and say if you leave the keys in, the car never fully goes to sleep; if you lock it and put the keys a full thirty feet away you shouldnt have an issue; I ran a trickle charger to the battery and a negative or ground spot a foot away from the battery so I can check the voltage with two alligators and a voltage meter at the front grill; you should get a reading - should be around 12.6 w a new battery and then lock it as abvove and then check every 12-24 hours; if you are losing say more than a .10v per two days you have either a car thats not shutting down or you have a parasitic drain from say an amp or radio thats not dshutting down; for this - if you suspect thids; close the hood switch to let the car think its all buttoned up lock it and then put the keys far away; then go through each fuse with a voltage meter and see if you have juice to one of them - note bene you MUST wait at least 20 - 30 m after shut down to ensure that the car is "sleeping."

Good Luck,

Dave
09 FFRR HSE
12 FFRR HSE