Description
The US Battery US AGM 8D is a heavy-duty 12V AGM battery rated at 308Ah, built in the large-format 8D case for marine, RV, and industrial applications that need maximum single-battery capacity. It's an ideal fit for equipment that can't run a series pack and needs one battery to do the heavy lifting.
At 308Ah and 169 lbs, this is the top of U.S. Battery's single-battery 12V AGM lineup — bigger than the 4D, and the option to reach for when even a 4D's 246Ah isn't enough and you still need everything running off one battery rather than a series-wired bank. That capacity comes with real installation planning: at this weight, it's a two-person job and the compartment needs to be built to hold it securely.
Why choose the US AGM 8D
- 308Ah — the largest single-battery capacity in U.S. Battery's 12V AGM lineup
- F14 terminal for heavy-duty wiring connections
- One battery instead of a series bank for equipment that needs single-unit capacity
- Sealed, non-spillable AGM chemistry — no watering, no acid spills
Specifications
| Model | US AGM 8D |
| Voltage | 12V |
| Capacity (20HR) | 308Ah |
| Capacity (5HR) | 252Ah |
| Reserve Capacity @75A | 180 min |
| Reserve Capacity @56A | 262 min |
| Reserve Capacity @25A | 728 min |
| Length | 20.5in (521mm) |
| Width | 10.6in (268mm) |
| Height | 8.86in (225mm) |
| Weight | 169 lbs (77kg) |
| Terminal | F14 |
| Case Material | ABS, Heat Sealed |
| Battery Type | Sealed AGM, Valve-Regulated |
Backed by U.S. Battery's manufacturer warranty. At 169 lbs this is a two-person install — talk to us about freight and handling before ordering.