Motobatt Battery MB5.5U Sealed Factory‑Activated Replaces: 12N5.5‑3B, 12N5.5‑4A

OVERVIEW

The Motobatt MB5.5U is a factory-activated sealed battery engineered to deliver reliable starting power and stable voltage output for classic motorcycles and small-displacement trail platforms. Constructed with advanced Absorbent Glass Mat chemistry and housed in a high-grade polypropylene shell, this unit replaces traditional flooded lead-acid cells that frequently struggle with corrosion or restrictive mounting layouts. Designed as a direct drop-in solution for vintage motorcycle frames, it provides immediate cranking engagement without requiring case modification or custom cabling.

ENGINEERING & PERFORMANCE

Powered by 7 amp-hour capacity and 105 Cold Cranking Amps, this sealed AGM unit consistently delivers strong cold-weather starting performance and steady electrical flow under load. The tightly packed fiber separator matrix and leak-proof casing shield sensitive internal plates from sulfation while maintaining structural integrity against intense engine vibration. Featuring the QuadFlex terminal architecture with four directional connection points, the battery eliminates wire strain and accommodates diverse aftermarket cable routing directly inside the stock tray. These operational improvements ensure rapid crank times and dependable voltage delivery throughout the chassis lifecycle.

KEY FEATURES

• Factory-activated sealed Absorbent Glass Mat (AGM) chemistry
• 12V operating voltage with 105 Cold Cranking Amps (CCA) and 7 amp-hour capacity
• QuadFlex terminal configuration featuring four interchangeable connection posts per pole
• High-density fiber separator construction delivering exceptional shock absorption and vibration resistance
• Completely sealed, maintenance-free design that eliminates electrolyte top-offs and equalization charging
• Direct physical and electrical interchangeability for OEM part numbers 12N5.5-3B and 12N5.5-4A
• Tightly constructed polypropylene casing prevents acid leaks and protects interior components
• Optimized charge acceptance curves that outperform conventional lead-acid alternatives over extended cycles

TECHNICAL SPECIFICATIONS

• Brand: Motobatt
• Part Name: MB5.5U Sealed AGM Battery
• Component Type: Replacement Battery
• Material: Absorbent Glass Mat (AGM) with high-grade polypropylene housing
• Supported Years: 1968–1985 (plus All Years variants for select Gilera and Piaggio platforms)
• Compatible Trims: Benelli 125 Custom Guzi, Gilera Apache through XR1, Kawasaki H2 through KZ400-C, Piaggio VESPA PX series, Yamaha AS2C through YR2/C models

FITMENT

• Benelli 125 Custom Guzi (All Years)
• Benelli 125 Guzzi (All Years)
• Gilera Apache Kick Start (All Years)
• Gilera Arizona Kick Start (All Years)
• Gilera Crona Kick Start (All Years)
• Gilera CX Kick Start (All Years)
• Gilera Dakota Kick Start (All Years)
• Gilera ER Kick Start (All Years)
• Gilera Fast Bike Kick Start (All Years)
• Gilera Freestyle Kick Start (All Years)
• Gilera GFR Kick Start (All Years)
• Gilera KK, KZ Kick Start (All Years)
• Gilera MX1, MXR Kick Start (All Years)
• Gilera Nebraska Kick Start (All Years)
• Gilera R1, R1S, Kick Start (All Years)
• Gilera RTX, RV, RX Kick Start (All Years)
• Gilera RV NGR Kick Start (All Years)
• Gilera SP01, SP02 Kick Start (All Years)
• Gilera T4 (All Years)
• Gilera TOP Rally Kick Start (All Years)
• Gilera XR1, XR2 Kick Start (All Years)
• Kawasaki H2 Series (1972–1975)
• Kawasaki KH400-A (1976–1978)
• Kawasaki KZ400-aS (1975–1977)
• Kawasaki KZ400-C (1978)
• Kawasaki S2 Series (1972–1973)
• Kawasaki S3 Series (1974–1975)
• Piaggio (VESPA) PX125+80E (All Years)
• Piaggio (VESPA) PX125+80E-AREC (All Years)
• Piaggio (VESPA) PX200E-ARC (All Years)
• Yamaha AS2C (1969)
• Yamaha HS1, HS1B (1970–1971)
• Yamaha RZ350 (1984–1985)
• Yamaha XS1 (1970–1971)
• Yamaha YAS1/C (1968)
• Yamaha YR2/C (1968)

WHY RIDERS CHOOSE THIS

Vintage motorcycle enthusiasts and dual-sport riders prefer the Motobatt MB5.5U because it bridges modern electrochemical reliability with period-correct packaging that fits securely inside aging plastic trays. The robust AGM architecture and high-density fiber separators prevent internal plate degradation, which maintains consistent voltage delivery and eliminates the sluggish crank times common with deteriorated flooded units. Engineered specifically for classic platform geometries, the QuadFlex terminal layout streamlines cable routing and removes installation guesswork, ensuring stable ignition feed and predictable charging distribution across demanding trail routes. This combination of elevated cranking power, leak-proof containment, and straightforward mounting makes it the definitive upgrade for chassis demanding exact dimensional compatibility.