FullRiver FT438-U1R Vehicle Battery

FullRiver FT438-U1R Automotive Battery

The FullRiver Full Throttle FT438-U1R is a 12V automotive battery built for compact vehicle applications that need reliable starting power and the correct physical fit. With 438 cold cranking amps and 35 amp hours, it supports consistent engine starts in Mazda Miata applications that call for Group U1R or 46A24L sizing.

• 12V automotive battery for starting and charging systems
• 438 cold cranking amps for dependable engine cranking
• 35 amp hours of reserve capacity
• 525 cranking amps
• Group U1R and Group 46A24L fitment
• Dimensions: 7.717 in. overall length, 5.158 in. width, 7.559 in. height
• Brass SAE terminal, left-hand positive orientation

Full Throttle Battery Line

The Full Throttle 12V Automotive Battery line from FullRiver is focused on direct-fit replacement batteries for vehicles that require specific case size, terminal layout, and starting performance. The FT438-U1R part number is a fitment-specific option for Mazda Miata models that use the listed battery configuration.

Fitment Details

• Fits 1990-1993 Mazda Miata, N/A. Group U1R; 438CCA; 35AH; Brass SAE Terminal LHP; O.E. battery is AGM (Valve Regulated Lead Battery); battery is vented to outside of vehicle; OEM BCI: 46A24L; OEM CCA: 320.
• Fits 1994-1997 Mazda Miata, N/A. Group U1R; 438CCA; 35AH; Brass SAE Terminal LHP; O.E. battery is AGM (Valve Regulated Lead Battery); battery is vented to outside of vehicle; OEM BCI: 46A24L; OEM CCA: 320.
• Fits 1999-2005 Mazda Miata, N/A. Group U1R; 438CCA; 35AH; Brass SAE Terminal LHP; O.E. battery is AGM (Valve Regulated Lead Battery); battery is vented to outside of vehicle; OEM BCI: 46A24L; OEM CCA: 320.

What This Battery Helps Address

• Slow or weak engine cranking in Mazda Miata starting systems
• Replacement needs for a battery with Group U1R or 46A24L dimensions
• Battery service on vehicles requiring a vented AGM-style original battery layout
• Fitment issues caused by incorrect terminal orientation or case size
• Starting performance loss from an aging 12V automotive battery

Installation Notes

Confirm the battery tray, terminal orientation, and venting setup before installation. This FT438-U1R battery is specified for Mazda Miata applications with left-hand positive terminal layout and the listed Group U1R / 46A24L dimensions. Verify the vehicle’s original battery specification against the part number FT438-U1R before installation.

Quality Assurance

FullRiver identifies this battery as part of its Full Throttle 12V Automotive Battery line and publishes key electrical and dimensional specifications for application matching. Use the listed CCA, amp hour rating, and case dimensions to confirm proper fitment for your Mazda Miata.