# MOTOBATT batteries > Motobatt AGM QuadFlex 4-terminal: MBYZ16HD, MB16U, MBTX9U, MBHD12-HP. Custom, Harley, big bike, scooter, quad. Replaces multiple YT/YTX. 24h delivery. **Category:** [Start](https://baterias.com/gb/beginning) → [Batteries](https://baterias.com/gb/batteries) - **Canonical URL**: https://baterias.com/gb/batteries-motobatt - **Language**: en-GB ## Description **Motobatt batteries**: premium AGM for motorcycle, scooter, quad, jet-ski, snowmobile and portable jump-starters, with patented **QuadFlex** technology — **four terminals (two positive + two negative)** giving universal polarity and fitment across virtually any bike, cutting stock variants. Top models: **Motobatt MBYZ16HD** (replaces YTX14, YTX16, YTX20), **MBHD12-HP** (high-current custom), **MB10U**, **MB16U**, **MB18U**, **MBTX9U**. **JumpStart** lithium jump-starters, **digital testers** and **smart chargers** too. Real stock, 24h mainland delivery, free 14-day returns. ## Motobatt QuadFlex: one battery, many bikes Motobatt is an Australian specialist in AGM motorcycle, scooter, quad and jet-ski batteries, with a unique market asset: **QuadFlex**. Each battery has **four terminals** (two positive and two negative at different positions) for universal polarity — a single Motobatt code replaces 3-5 YT/YTX references depending on the bike, dramatically simplifying stock for shops and multi-bike owners. Motobatt are **sealed AGM**, spillproof, take extreme vibration (rated for off-road, motocross, custom and high-seat models) and mount at any angle. Standard pick on Harley-Davidson custom, café racer, restomod, big naked with electrical loads and modified bikes with audio or aux lighting. ## Full Motobatt range Line Technology Application Top models QuadFlex AGM 4-terminal AGM Universal motorcycle, scooter, quad MB10U, MB12U, MB16U, MB18U, MBTX9U MotoBatt HD Heavy Duty Reinforced AGM Custom, big bike, cold climates MBYZ16HD, MBHD12-HP, MBHD18 Premium Lithium LiFePO4 Sport bike weight saving, racing MPLX9U, MPLX14U, MPLX20U JumpStart Lithium Portable lithium Emergency jump-starter MB-JS-12, MB-JS-20 BatteryAnalyser Digital tester Bike/car analyser MB-AN10, MB-AN20 Smart Charger Multi-stage charger Bike/car maintenance MB-CH7, MB-CH12 ### Motobatt by application - [Motobatt QuadFlex AGM](/gb/batteries-motobatt-quadflex) — best-selling line. Replaces multiple YT/YTX thanks to QuadFlex. - Motobatt HD Heavy Duty — reinforced version for custom Harley, big bike and demanding cold cranks. - Motobatt Premium Lithium — LiFePO4 for sport bikes where weight matters, 4x lighter than AGM. - Motobatt JumpStart — portable emergency jump-starter for motorcycle/small car. - Motobatt BatteryAnalyser — digital CCA and voltage tester. - Motobatt Smart Charger — multi-stage smart charger. ### Best-selling Motobatt models - **Motobatt MBYZ16HD** — Heavy Duty 16.5Ah 240A. Replaces YTX14-BS, YTX16-BS, YTX20-BS, YTX20H-BS. Harley custom, BMW R, Honda Africa Twin. - **Motobatt MB16U** — QuadFlex 19Ah 230A. Big naked and trail (Yamaha MT-09, Triumph Tiger). - **Motobatt MBTX9U** — QuadFlex 10.5Ah 160A. Replaces YTX9-BS. Mid naked (Yamaha MT-07, Honda CB650, Kawasaki Z650). - **Motobatt MB10U** — QuadFlex 11Ah 165A. Replaces YB10L-A2. European custom and restomod. - **Motobatt MB18U** — QuadFlex 22Ah 270A. Maxi-trail, big Harley, BMW K. - **Motobatt MBHD12-HP** — Heavy Duty high-current 13Ah 230A. Demanding custom and modified. ### Motobatt vs Varta Powersports vs others All quality motorcycle AGM. **Motobatt** stands out via **QuadFlex** (one code replaces several YT/YTX), the Heavy Duty line aimed at custom and the accessory ecosystem (jump-starters, testers, chargers). **Varta Powersports** is the OEM choice on European bikes. For custom, big bikes or multi-bike fleets, Motobatt simplifies stock and brings extra-reinforced AGM. ### Frequently asked questions ### **What is QuadFlex?** Motobatt patent: four terminals (two positive and two negative) on each battery, giving universal polarity — a single code replaces 3-5 different YT/YTX depending on bike. ### **Does Motobatt fit Harley-Davidson?** Yes, the Heavy Duty line (MBYZ16HD, MBHD12-HP) is a standard pick on Harley custom thanks to high cranking current and vibration resistance. ### **How long does a Motobatt last?** 3-5 years on AGM in normal use; 5-8 years on Premium Lithium with the right charger. ### **Does Motobatt ship activated?** Yes, QuadFlex and HD ship precharged and activated — install out of the box, no acid handling. ### **Is Motobatt good for custom builds?** It's one of the most popular brands in the American and European custom scene thanks to QuadFlex (fits regardless of modified-bike polarity) and Heavy Duty toughness. ### **How long does shipping take?** Standard delivery **1 to 5 working days** to your country. We process orders within 24h. Motobatt catalogue curated by our technical team. **10,908 Trustpilot reviews · 4.4/5**. 24h mainland delivery, free 14-day returns. ## Products in this category | Product | Brand | Price | |---|---|---| | [Motorcycle battery Motobatt MBTX20U 12V 21Ah 310A](https://baterias.com/gb/battery-motobatt-mbtx20u-21ah) | MOTOBATT | 148,56 € | | [Motorcycle battery Motobatt MBTX12U 12V 14Ah 200A](https://baterias.com/gb/battery-motobatt-mbtx12u-14ah) | MOTOBATT | 77,39 € | | [Motorcycle battery Motobatt MBYZ16H 12V 16Ah 240A](https://baterias.com/gb/battery-motobatt-mbyz16h-16ah) | MOTOBATT | 134,99 € | | [Motorcycle battery Motobatt MBTX9U 12V 10Ah 160A](https://baterias.com/gb/battery-motobatt-mbtx9u-105ah) | MOTOBATT | 76,48 € | | [Motorcycle battery Motobatt MBTX30U 12V 32Ah 385A](https://baterias.com/gb/battery-motobatt-mbtx30u-32ah) | MOTOBATT | 173,86 € | | [Motorcycle battery Motobatt MTZ5S 12V 4Ah 65A GEL](https://baterias.com/gb/battery-motobatt-mtz5s-yb4lb-ytx4lbs-12v-42ah-65a) | MOTOBATT | 36,34 € | | [Motorcycle battery Motobatt MBTX7U 12V 8Ah 115A](https://baterias.com/gb/battery-motobatt-mbtx7u-8ah) | MOTOBATT | 71,34 € | | [Motorcycle battery Motobatt MBTX20UHD 12V 21Ah 310A](https://baterias.com/gb/battery-motobatt-mbtx20uhd-21ah) | MOTOBATT | 148,56 € | | [Motorcycle battery Motobatt MTZ6S 12V 6Ah 95A GEL](https://baterias.com/gb/battery-motobatt-mtz6s-ytx5lbs-ytz7s-12v-6ah-95a) | MOTOBATT | 45,53 € | | [Motorcycle battery Motobatt MTX9A 12V 9Ah 140A GEL](https://baterias.com/gb/battery-motobatt-mtx9a-ytx9bs-12v-9ah-140a) | MOTOBATT | 163,19 € | | [Motorcycle battery Motobatt MBYZ16HD 12V 16Ah 240A](https://baterias.com/gb/battery-motobatt-mbyz16hd-ytx14bsytx14lbsytx14hbs-gyz16h-12v-165ah-240a) | MOTOBATT | 154,76 € | | [Motorcycle battery Motobatt MB9U 12V 11Ah 140A](https://baterias.com/gb/battery-motobatt-mb9u-11ah) | MOTOBATT | 119,11 € | | [Motorcycle battery Motobatt MTX7L 12V 7Ah 105A GEL](https://baterias.com/gb/battery-motobatt-mtx7l-ytx7lbs-12v-7ah-105a) | MOTOBATT | 148,79 € | | [Motorcycle battery Motobatt MTX7DL 12V 7Ah 105A GEL](https://baterias.com/gb/battery-motobatt-mtx7dl-12v-7ah-105a) | MOTOBATT | 54,95 € | | [Motorcycle battery Motobatt MTX7A 12V 7Ah 110A GEL](https://baterias.com/gb/battery-motobatt-mtx7a-ytx7abs-12v-7ah-110a) | MOTOBATT | 51,44 € | ## Technical team (editorial authorship) The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team — over 25 years of experience validating automotive batteries. → https://baterias.com/gb/technical-team --- *baterias.com — Automotive batteries · 2026-07-30*