Moto Guzzi MGX-21 Flying Fortress Battery
2016–2018. The OEM battery case the MGX-21 Flying Fortress takes, the lithium that drops into it, and every model year we have on file. One case across the whole run.
2018 Moto Guzzi MGX-21 Flying Fortress
- OEM battery
- YTX20-BSYuasa 2026 OEM guide
- Case family
- YTX2012V starter case
- Fits all years
- 2016–2018same case every year on file
The Moto Guzzi MGX-21 Flying Fortress takes the YTX20-BS case. The Antigravity ATX20 RE-START is a drop-in for that case: 680 cranking amps, 4 lb, a built-in jump start that saves enough charge to get you home.
See the Antigravity ATX20
MGX-21 Flying Fortress battery by model year
| Model years | OEM battery | Where it comes from | Lithium that fits |
|---|---|---|---|
| 2016–2018Your year · 2018 | OEM batteryYTX20-BS12V starter case | Where it comes fromYuasa 2026 OEM guide | Lithium that fitsAntigravity ATX20 RE-START →Antigravity ATX20-HD →Ionic S6 → |
Trim covered: MGX-21 Flying Fortress.
Shop all Moto Guzzi batteriesWhat the MGX-21 Flying Fortress needs, in plain English
Every MGX-21 Flying Fortress from the first 2016 model through 2018 starts on the YTX20-BS case, a 12-volt starter battery. Moto Guzzi ships it with a lead-acid battery that starts to fade after two or three seasons of short rides and off-season storage, and that is usually the day a rider goes looking for something better.
The lithium drop-in is the Antigravity ATX20 RE-START: 680 cranking amps, 4 pounds, the same case in lithium. Its RE-START function puts the battery to sleep before a parasitic draw can drain it, then wakes it with one press for a jump start. Charge it with a lithium-compatible charger or maintainer for the off-season and it outlasts the lead-acid battery it replaces by years.