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Prices may varyThis product ranks #5 of 19 in Automotive Battery.Three above it ↓
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.
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.
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.
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.
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.
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.
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.
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.
The Amazon listing for Optima Batteries RedTop 25 Starting Battery carries a California Prop 65 warning. California requires this warning on a very wide range of manufactured goods — including rubber, vinyl, plastic, and metal automotive parts — whenever trace exposure to any of roughly 900 listed substances (commonly phthalates or heavy metals) is possible, regardless of whether the specific product poses a meaningful health risk. As a passive accessory, Optima Batteries RedTop 25 Starting Battery has no Safety Data Sheet, so there's no chemistry breakdown to translate beyond that.
Marketing copy from Optima Batteries, via Amazon. Not editorial.
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