OPTIMABatteries High Performance D51R YellowTop Dual Purpose Sealed AGM Car, Truck and SUV Battery, 450 CCA, Maintenance Free, Versitile Mounting

Just thought I'd add a review since I've noticed that many websites having incorrect recommendations about which batteries will fit in the Highlander since they do not differentiate between the hybrid and non-hybrid versions. (Hybrid = Size Group 51R)So, the 5 star rating is purely for the fit---I will update this review if the battery does not perform comparably or better than the battery it's replacing--- it's an exact fit for the battery indentation at its base (where battery temp gage can monitor it accurately + keep it from sliding) as well as for the battery cover to slide down over top of it in a 2006 Toyota Highlander Hybrid.And for anyone else purchasing for this vehicle, here was my reasoning for choosing this particular battery:So, I was initially hesitant to buy this battery since it had a lower CCA (450) / CA (575) / RC (66) than its previous battery, which was an Autocraft Gold 51R-2 (standard lead-acid flood) battery with CCA 500, CA 625, RC 85 min. However, since the Highlander hybrid's engine is started by the traction battery and not the 12V battery (and therefore not utilizing peak CA draw), it's my presumption that having a deep cycle battery will hold up better in the long run since the '06 HH has a tendency to suck batteries dry in relatively short periods of time (which generates hybrid system fault codes if the 12V runs too low to run the controllers)---and since AGM batteries can accept a charge faster than a standard battery and have a slower self-discharge rate, it might tolerate the constant charging/discharging better over time.(Side note: the Autocraft battery was already above OEM requirements, so dropping to a lower CA battery should not be a problem in this instance.)In short: despite a lower peak & average cranking amps, I'm thinking that the YellowTop's more favorable charge/discharge properties (and longer lifespan) may make this a better choice for my vehicle.***UPDATE, 3 YRS OUT***Lasted almost exactly 3 years; not holding a charge like it should now, but still useable until the replacement arrives with an occasional booster charge. I think what finally did it in was when the battery had a total discharge when I was gone for around 3.5 months in the winter - didn't seem to hold a charge properly afterward (using an AGM smart charger), though it worked for several weeks. I think the lifespan was acceptable given that it was always outside in the Sacramento-heat / triple-digit summers. I plan to purchase this again.

Car starts. No issues, ever.

The Optima battery is a perfect example of a company churning out a substandard product while riding on its past reputation. I purchased mine in Sep 2017, it's lost its ability to hold a charge as of December 2020. In 48hrs while sitting disconnected it'll self discharge from 12.8vdc to 12.0vdc, that's just under 50% full charge capacity for an AGM, and it's struggling to come up with the amperage required to kick over my starter. That means I got 3 years and 3 months of service out of it. The battery was never abused, frozen, deeply discharged, or overheated (lives in the trunk in my application) and while not in use, was disconnected from the vehicle and maintained with an Optima Digital 400 charger. Literally perfect life for a battery. 3 years and 3 months is not acceptable for a "premium" AGM product.I'd recommend skipping Optima and instead get an Odyssey, NorthStar, or Interstate AGM, *ANYTHING* but an Optima.

Fits fine and has been working well in my 2012 Nissan Leaf.

I spent extra money for what I thought was a great value. I have a red battery for my Murano and it has worked well for years. But this thing died after two months and will not take a charge. Amazon says I can't return it. So I got myself a big expensive paperweight it seems.I take it back. Called the company and they explained that if the car sits dormant for an extended period it looses charge severely. It is easily remedied by charging with trickle charger. It doesn't accept charge from big smart charges when it gets like that. I followed the advise and they were right. Battery is working like a champ, just like my other Optima battery.

A high quality and durable battery that provides peace of mind the car will start. I’ve had a number of typical lead acid batteries that fail in less than two years. This AGM battery delivers results for many years.

I was afraid of buying it with so many negative feedback on Amazon, but up to today, it's been working no issues. And I do have a dash cam that's connected 24/7 directly to thr battery. No sign of battery drain. Holding up great.

Purchased in 2022. Dead already. Way too short of a life for a $300 battery.