OPTIMA Batteries High Performance D35 YellowTop Dual Purpose Sealed AGM Car, Truck and SUV Battery, 620 CCA, Maintenance Free, Versitile Mounting

Confirmed fit in 2001 Porsche 911 (996) 3.4L Coupe. This battery is the best battery you will get for your Porsche. Typically I get about 7 years out of the yellow top and most of us don't daily our 911s so a deep cycle battery like this one won't let you down. Deep cycle batteries are tough and Optima gel cell batteries resist vibration, which is the primary killer of a battery. My 996 tends to sip down electricity just sitting. Repeated draining of the battery will kill a standard battery , even a red top Optima... which are trash (IMO) but the yellow won't suffer nearly as bad as a standard battery. Car cranks nice and strong every time even if she sits for a week or two.Pro Tip -Mounting : This battery is NOT a direct fit to the battery box. Optima doesn't make a direct fit replacement battery for a Porsche 996 at the time of this post. A custom spacer is needed to lock down the battery so it doesn't move. Some people use a high density plastic, like a thick cutting board to fashion one. I used a 12mm or 13mm combo wrench as a spacer. It was the perfect size, shape and had the rigidity to do the job. I was able to really crank it down and the wrench had enough tension to act like a strong spring on the hold down tabs of the battery. This might sound like a "backyard fix". It works, and works great. I have had the battery in the Porsche for a year and 6,000 mi now. It has withstanded a lot of spirited driving , jars and bumps and still it's solid.Battery terminals are in the correct orientation and the Factory Porsche Battery cables are plenty long enough to reach.

This is my fourth purchase of an Optima dry cell battery. I still have all four.My old Chevy 4x4 pick up. I bounced down the road cause I drove the heck out of it. Battery acid was everywhere and I was replacing the wet cell batteries every year. In 2006,I installed an Optima Red Top. No more spills and better starting power. I have used that same old Red Top in two pick ups and one car, sold the cars but kept the battery for a spare cause it fits most applications and still starts most any car or pick up at 6 years old. In 2006 our new pick up kept going dead cause we parked it most if the time. The alarm system would kill the wet cell battery after a couple of weeks parked. Bought a Yellow top, now it can be parked for just over a month with the alarm on before the batter goes low. We stored the pick up for three months with the alarm off and it never went dead. Yea you car alarm will kill your battery eventually. Yea you'll need a deep cycle type maintenance free setting on your home battery charger, if you need to recharge Optima batteries. Most new chargers have that setting too.If you buy a new charger with the 50 amp jump starting feature, you'll never wait for a tow truck.My old 2008 corolla needed a replacement battery in 2012. Yep, Optima Yellow Top was my choice cause I like to listen to the stereo with the engine off for hours. The car always starts right up now. Oh yea put two Optima Blue Tops in my boat for peace of mind. Wired in a Perko boat battery switch so I never have a dead battery. If we beach the boat and play the stereo all day long, I can switch to the full battery to insure we all get home safely. Yea you can do the same with wet cell batteries but they won't last as long and charge back up as easy as Optima batteries. Plus you can mount Optimas sideways or upside down to make more room. Just don't short out the battery terminals. Note:some modification of battery mount hardware may be needed in some applications but most just fit perfect. Check the battery post locations before you buy. I looked at the over priced batteries at my local car parts store first, took some measurements, then ordered from Amazon.Yes Optima batteries are about double the price of most replacement wet cell batteries, but well worth it.Amazon is awesome, the lowest price and you don't have to carry the new battery home. Who doesn't love free shipping. Order yours today and in about a week the nice Fed Ex or UPS person will carry that heavy battery right to your door or garage.

This product does not hold charge after less than 18 months. Won't even keep enough juice to unlock the doors from the remote (overnight charge = nothing).Terrible product and terrible service on the warranty by both Amazon and Optima. Still don't have a battery or money back. Buy 3 cheap $100 batteries, they will outlast this one.Shame on Amazon for not honoring the warranty and using stall tactics to avoid and defer refunds.Despite the warranty information file that amazon publishes on their own site, they are trying several tactics, like requesting denial of service emails from Optima being forwarded to Amazon customer service, likely hoping consumers will just walk away. Clearly Amazon has refunded others based on the reviews, so they are aware of Optima's policy, so this is purely a stall tactic. All this despite the clearly stated policy that is published on Amazon and Optima websites below:OPTIMA Batteries, Inc. expects its distributors/dealers to warranty to the original user batteries used within the United States for models D27F, D34/78, D75/25, D34, D35, D51, D51R; the following Guarantee Warranty : PERSONAL CONSUMER USE 36-MONTH GUARANTEE OPTIMA Batteries, Inc. guarantees to the original personal/commercial user that the above OPTIMA deep cycle batteries will be free from defects in material or workmanship for three years after purchase date. User must promptly report any alleged defects to authorized distributors/dealers, provide the original sale receipt to establish proof of purchase and warranty date, and permit examination by their service personnel. If the authorized distributor/dealer finds the battery to be defective as a result of material or workmanship, they will provide a replacement F.O.B. their location . All replacement batteries will be warranted for the balance of the original warranty period.

Upgraded to a yellow top after my car felt sluggish to start in the winter. The extra power behind this technology helps my car start in below freezing temperatures just like warm or hot days. It came with adapters to help get the right fit. It's a car battery so just like any others it definitely has weight to it. As mentioned before my car starts quickly with no issues. Installation was easy.