Optima Batteries RedTop 25 Starting Battery
Priced as of May 27, 2026
4.3(1,485 ratings)Buy on AmazonSaved to your guest loadout. Sign up to also save to your Cabinet (consumables) or Kit (tools you own).
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CarCareTruth's Analysis
Last reviewed May 27, 2026
TL;DR Group 25 SpiralCell AGM — 720 SAE CCA, 90-minute RC, 4–5 year community-confirmed service life on hot rods and conventional non-start-stop builds. Group 25 is NOT Group 35; will not fit Group 35 trays (WRX/STI through 2024) without an adapter.
What it is and how it performs
Group 25 sealed AGM with SpiralCell spiral-wound construction — manufacturer-confirmed chemistry. Optima publishes 720 SAE CCA cleanly; no PCA substitution. RC 90 minutes. 3-year full-replacement warranty; community service life 4–5 years on pure starting applications; deep discharge causes capacity loss. Group 25 is a narrower BCI group than Group 35, targeting hot rods, older compact cars, and off-road builds where Group 25 is OEM-specified.
Who should buy this — and who should skip it
Right pick for a native Group 25 vehicle — hot rods, older compact cars, off-road builds — needing vibration-tolerant sealed AGM and clean SAE CCA. Skip if your vehicle specifies Group 35: the OEM hold-down will not secure this battery without an aftermarket adapter, including all Subaru WRX/STI generations through 2024.
Safety and environmental impact
Sealed AGM — no chemical exposure pathway from the battery in normal installation. The Prop 65 lead warning attaches to the lead hardware as a labeling fact. Spent lead-acid batteries flow through the retail core-charge return system; 99% are recycled at certified smelters.
Frequently asked questions
Does the Optima RedTop 25 fit the Subaru WRX or STI?▾
No — not without an aftermarket adapter bracket. The WRX and STI (all generations through 2024) specify a Group 35 battery, which has different dimensions than the Group 25. The RedTop 25 is narrower and shorter than a Group 35 battery and will not be secured properly by the OEM Group 35 hold-down bracket. Some marketplace listings incorrectly cross-list the RedTop 25 as fitting the WRX — this is a seller error, not a Optima specification. Buyers who want an Optima for the WRX/STI should look for the Group 35 RedTop instead.
What is the difference between Group 25 and Group 35?▾
Group 25 and Group 35 are distinct BCI group sizes with different physical dimensions — they are not interchangeable. BCI Group 25 nominal dimensions are approximately 9.0 inches long by 6.75 inches wide; Group 35 nominal dimensions are approximately 9.06 inches long by 6.88 inches wide. While the length and width are close, the hold-down bracket, battery tray depth, and cable reach on any given vehicle are sized for the OEM-specified group. A Group 25 battery placed in a Group 35 tray will not be secured properly by the OEM hold-down bracket without modification or an adapter.
Is the 720 CCA figure SAE or a marketing number?▾
720 CCA is the SAE J537 cold-cranking amp figure, published cleanly by Optima as the primary cranking spec in the Amazon title and feature bullets. There is no PCA (Power Cranking Amps) or other marketing-figure substitution on the RedTop 25 — the 720 figure is directly comparable across battery brands using the SAE standard.
Is this battery an add-on item on Amazon?▾
Yes — the RedTop 25 carries the Amazon add-on item flag as of 2026-05-27, meaning it requires a qualifying order to purchase standalone on Amazon. The battery is widely available at AutoZone, O'Reilly, Advance Auto Parts, and other major automotive retailers where the add-on restriction does not apply.
From the manufacturer
Marketing copy from Optima Batteries, via Amazon. Not editorial.
- •BATTERY SPECS: 12-Volt, 720 Cold Cranking Amps, Size: 9.38" Long x 6.75" Wide x 7.69" Tall, Weight: 31.7 pounds, SAE Posts, C20 Capacity: 44 AH
- •RESERVE CAPACITY of 90 minutes for constant performance. Faster charging capabilities.
- •SPIRALCELL TECHNOLOGY: SPIRALCELL TECHNOLOGY with 99.99% pure lead delivers more power and consistently outperforms conventional flat-plate batteries. Optimal starting power even in bad weather.
- •LONG LASTING: Fifteen times more resistant to vibration than standard flooded battieres for durability and Up to 3 times longer life vs. standard flooded batteries.
- •MAINTENANCE FREE: For maximum convenience. Ideal for basic electrical demands.
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Manufacturer videos
Manufacturer images
Manufacturer specifications
- Brand
- OPTIMA
- Vehicle Service Type
- Passenger Car, Truck
- Size
- 10-5/16 x 6-13/16 x 7-5/8 inch
- Voltage
- 12 Volts
- Battery Cell Composition
- Lead Acid
- Item Weight
- 32 Pounds
- Product Dimensions
- 6.81"D x 10.31"W x 7.63"H
- Terminal
- SAE Terminal
- Automotive Fit Type
- Vehicle Specific Fit
- Manufacturer
- OPTIMA
- Compatible with Vehicle Type
- Passenger Car, Truck
- Item Dimensions D x W x H
- 6.81"D x 10.31"W x 7.63"H
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Top Amazon review
↗External — Amazon's most-helpful review for context.
Fantastic Long Lasting Battery
Great battery with a steep upfront cost but well worth it for sure. I use Optima batteries in my three vehicles (2021 Jeep Wrangler Sport / 2010 Dodge Caliber SXT / 1983 5.0 F-150 4x4. Living in Central Nevada @ 7000 ft we have super cold winters (in 8 yrs 2 times seeing -20 degrees) & barely 110 days above freezing. With that said I have learned how to make these batteries last with near new cranking power at the 2-to-4-& beyond year mark by using a disconnect on the negative battery terminal. The reason is simple if you let an Optima discharge its done.Professional Battery for Cold Cranking Amp Power.Thanks, Amazon as auto parts stores rack up the retail price pretty high & charge you a core price too!