Optima Batteries YellowTop D51R Dual-Purpose AGM Battery

The D51R is a BCI Group 51R battery with a reverse-polarity SAE top-post terminal. Confirmed applications in the CCT vehicle-fitment index include the current-generation Honda Civic, plus older Civic generations, Honda Element, HR-V, Insight, Clarity, CR-V, Acura Integra and RSX, Nissan GT-R and Versa, and the Toyota MR2 Spyder. Always confirm your specific year and trim against the manufacturer's fitment guide before purchase.

450 CCA is the figure Optima publishes as the primary cranking spec in the Amazon listing title and feature bullets, and it is a genuine SAE-style cold-cranking rating, not a Power Cranking Amps or other marketing substitute. The manufacturer's own technical spec sheet lists a slightly different figure, 460 amps at BCI 0F, which is a minor cross-source variance rather than a substituted figure.

Both are the same Group 51 case and SpiralCell AGM construction. The D51 (part 8071-167) has standard-polarity top posts; the D51R (part 8073-167, this product) has reverse-polarity posts. The R suffix is the detail that matters for fitment: a vehicle that specifies reverse polarity needs the D51R, not the D51.

Community reports are mixed rather than uniformly strong. Some owners report failures in the 2 to 3 year range, while others report 6 to 13 years of service. Treat this as an average AGM lifespan for planning purposes rather than assuming the longer end of that range.

SpiralCell is Optima's spiral-wound cell construction, where the lead-tin alloy plates and absorbed glass mat are wound into a tight cylinder rather than stacked flat as in conventional flooded and most AGM batteries. Optima and third-party retailers cite this construction as roughly 15 times more vibration-resistant than a standard flooded battery.