I've had a DieHard Gold battery in my 1967 Thunderbird (and previously in my 1999 Continental.) The T-Bird 's got a big block engine and a lot of electrical components for a 40-year old car. I'm in Las Vegas where the summer heat will cook a battery to an early death. The warranty on the DieHard Gold in itself is worth the money - I've gotten a free full replacement previously on it. It went bad again recently. My T-Bird sits a long time and often the battery has to be recharged from sitting in storage. After draining and recharing so many times, it finally went bad this time so I took it in for replacement. I was going to get an Autolite battery from the Checkers across the street just to keep the OEM theme parts-wise under the hood, but I wanted to do some research into batteries to put the best I could find in this time and gain better peace of mind. The DieHard Gold I had was beyond the 3-year full replacement, but I still got a $64 prorated credit against the original $74 purchase price. I opted to upgrade to this platinum battery because there's nothing more frustrating than the car not starting after sitting for a long time. I was also considering going with an Optima battery, but after doing my homework I opted for this DieHard Platinum because the warranty is just unbeatable and I've never had any hassle with Sears in warranty replacements. The footprint on this battery is about the maximum that the factory battery tray would take...it's about a 10" x 7" battery; it fit, but was almost too wide. After installing it, the Thunderbird fired right-up. I also noted that the dash lights which used to be fairly dim were much brighter both with the car running and off (previously, they were dim with the car off and not much brighter with it running.) I've never seen a (new) battery improve the voltage flow through a car, especially an old car. So, I checked the standing voltage on the battery. It tested at 12.99 volts with the car off (every other battery I've seen tests between 11-12 volts.) That was pretty impressive in itself. The long haul will determine my ultimate opinion on this battery, but so far I am pretty pleased. I paid a bit more than I would have for a similar conventional battery, but with the prorate from the DieHard Gold warranty, I still feel that I got a good deal and an excellent battery, but most importantly (to me) is the peace of mind. I'd recommend this battery even over any other battery on the market, even the Optima battery. It's got every internal feature that an Optima battery has, and a few more engineering features the Optima doesn't. But the 4-yr replacement/52-month prorate warranty makes this battery the best deal in the market that I could find.
I bought the Die Hard Platinum battery & installation for my 2005 Acura RL at the local Sears store. The battery group size specified for my car is 24, the only size not made in the Platinum series. The alternate Platinum group size specified by Sears for my car is 34. The post design of the battery made it impossible for the Sears installer to get the cables on to the posts of the group 34 battery. The only option was to install the smallest group size Die Hard Platinum Battery, which is smaller than Acura specifies for my car and undersized for the battery plate. I am very dissatisfied with the Die Hard Platinum battery. The concept is great (which is why I wanted it), but the design and fit are extremely poor. As such, it is not worth the premium cost and, had I known that it be such a poor fit for my car, I never would have considered buying it.
Would not hold a charge for a week. Sears would not exchange or replace. Said "all was fine". Worst service too!! Good for an anchor or a really heavy paperweight but not as a car battery.