12 V
Voltage
Mazda Miata Batteries
Mazda Miata Batteries — the Right Fit for Every NA & NB (1990–2005)
Shopping for a Mazda Miata battery? Here's the part that trips most owners up: every Miata from 1990 through 2005 uses the same battery, NA and NB alike. It's a Group U1R sealed AGM (the Deka 8AMU1R): 12V, 320 CCA, sized to drop straight into the Miata's trunk tray. Pick your generation below for an exact fit.
320
CCA
U1R
BCI Group
AGM
Sealed
Why a sealed AGM for a Miata
The Miata's battery sits in the trunk, just behind the cabin, so a sealed AGM is the right type for practical reasons: it can't spill or vent acid in an enclosed space, it handles the vibration of back-road and track driving, and it holds its charge far better when the car sits (which most Miatas do). The Deka 8AMU1R is the correct Group U1R size and terminal layout for the factory tray, so it fits and secures with the original hold-down.
✓
Made in USA
Genuine Deka
★
1-Year Warranty
Free replacement
✓
Ships Charged
Ready to install
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Fitment Help
Ask before you order
Want the full rundown before you buy? Our Mazda Miata battery guide covers the size and specs, where the battery is located, AGM vs. lithium, and how to replace it, for both NA and NB. And to keep a weekend Miata healthy between drives, see our 12V battery chargers & maintainers.
Quick answers
Which battery fits my Miata? If it's a 1990–1997 (NA) or 1999–2005 (NB) with the battery in the trunk, it's the Deka 8AMU1R (Group U1R). Choose your generation above.
Do the NA and NB use the same battery? Yes — the same 8AMU1R fits both. They're listed separately by generation so you can order with confidence.
Not sure of your battery's location? Every 1990–2005 Miata came with it in the trunk. If yours is under the hood, reach out and we'll point you to the right battery.
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