Milwaukee M18 REDLITHIUM Forge HD12.0 Battery vs RYOBI 40V Lithium-Ion 4Ah High Capacity Battery
Head-to-head spec comparison to help you pick the right battery for your needs.
Deciding between a genuine pack and a cheaper aftermarket one? Read our honest genuine vs aftermarket batteries guide.Read the guide →
Spec-by-Spec Comparison
| Spec | Milwaukee M18 REDLITHIUM Forge HD12.0 Battery | RYOBI 40V Lithium-Ion 4Ah High Capacity Battery |
|---|---|---|
| Platform | M18 | 40V |
| Voltage | 18V | 40V MAX |
| Capacity | 12 Ah | 4 Ah |
| Type | high-output | high-output |
| Genuine OEM | Yes | Yes |
| Fuel Gauge | No | No |
| Warranty | 5 years | 3 years |
| Price | $213.83 | $104.99 |
| Rating | 8.9/10 | 8.4/10 |
| Buy on Amazon | Buy on Amazon |
Pros & Cons
Milwaukee M18 REDLITHIUM Forge HD12.0 Battery
Pros
- Genuine Milwaukee M18 Forge line, covered by Milwaukee's 5-year warranty
- 12.0Ah capacity is built for heavy-draw M18 tools that eat through smaller packs
- Fits the entire M18 lineup without any platform conversion
Cons
- Premium price — the most expensive pack in this M18 lineup
- Overkill capacity for light-duty tools like drivers or flashlights
- No fuel gauge readout mentioned for this pack
RYOBI 40V Lithium-Ion 4Ah High Capacity Battery
Pros
- Genuine RYOBI 40V pack backed by RYOBI's 3-year warranty
- 4Ah capacity suits RYOBI's outdoor power equipment lineup — mowers, trimmers, blowers
- Fits the full RYOBI 40V platform
Cons
- Listed as low stock at the time of this write-up — availability can be inconsistent
- Mid-range price relative to smaller-capacity 40V packs
- Only compatible with 40V tools, not ONE+ 18V
Our Verdicts
Milwaukee M18 REDLITHIUM Forge HD12.0 Battery
The Forge HD12.0 is Milwaukee's high-capacity M18 answer for tools that drain smaller packs fast — genuine-OEM chemistry and warranty, at a genuine premium price.
RYOBI 40V Lithium-Ion 4Ah High Capacity Battery
A genuine RYOBI 40V pack for the outdoor-tool side of the lineup — solid capacity for mowers and trimmers, though stock availability has been inconsistent.
More Comparisons
Milwaukee M18 REDLITHIUM Forge HD12.0 Battery vs Milwaukee M18 REDLITHIUM 5.0Ah Battery (48-11-1850)Milwaukee M18 REDLITHIUM 5.0Ah Battery (48-11-1850) vs RYOBI 40V Lithium-Ion 4Ah High Capacity BatteryMilwaukee M12 REDLITHIUM 2.0Ah Battery (2-Pack) & Charger Kit vs Milwaukee M18 REDLITHIUM Forge HD12.0 BatteryMilwaukee M12 REDLITHIUM 2.0Ah Battery (2-Pack) & Charger Kit vs RYOBI 40V Lithium-Ion 4Ah High Capacity BatteryDEWALT 20V MAX 5.0Ah Battery (DCB205) vs Milwaukee M18 REDLITHIUM Forge HD12.0 BatteryDEWALT 20V MAX 5.0Ah Battery (DCB205) vs RYOBI 40V Lithium-Ion 4Ah High Capacity BatteryDEWALT 20V MAX Compact 2.0Ah Battery (DCB203) vs Milwaukee M18 REDLITHIUM Forge HD12.0 BatteryDEWALT 20V MAX Compact 2.0Ah Battery (DCB203) vs RYOBI 40V Lithium-Ion 4Ah High Capacity Battery