Milwaukee M18 REDLITHIUM 5.0Ah Battery (48-11-1850) vs RYOBI ONE+ 18V Lithium-Ion Starter High Performance Kit with 2.0 Ah Battery, 4.0 Ah Battery, and Charger
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 5.0Ah Battery (48-11-1850) | RYOBI ONE+ 18V Lithium-Ion Starter High Performance Kit with 2.0 Ah Battery, 4.0 Ah Battery, and Charger |
|---|---|---|
| Platform | M18 | ONE+ 18V |
| Voltage | 18V | 18V |
| Capacity | 5 Ah | 0 Ah |
| Type | high-output | kit |
| Genuine OEM | Yes | Yes |
| Fuel Gauge | No | No |
| Warranty | 5 years | 3 years |
| Price | $67.99 | $97 |
| Rating | 8.8/10 | 8.6/10 |
| Buy on Amazon | Buy on Amazon |
Pros & Cons
Milwaukee M18 REDLITHIUM 5.0Ah Battery (48-11-1850)
Pros
- Genuine Milwaukee M18 pack backed by Milwaukee's 5-year warranty
- Drops straight into any M18 tool — no adapters, no guesswork
- 5.0Ah capacity gives solid runtime for daily-use M18 tools
- REDLITHIUM cell design is Milwaukee's own in-house spec
Cons
- No onboard fuel gauge — can't check remaining charge at a glance
- Costs more than aftermarket M18-compatible packs
- Only fits the M18 platform, not M12 or other brands
RYOBI ONE+ 18V Lithium-Ion Starter High Performance Kit with 2.0 Ah Battery, 4.0 Ah Battery, and Charger
Pros
- Includes two batteries — a compact 2.0Ah pack and a higher-capacity 4.0Ah pack — plus a charger, all genuine Ryobi
- Two different pack sizes cover both lightweight/compact use and longer-runtime use from one purchase
- Good value for a two-battery-plus-charger bundle at under $100
Cons
- Currently showing low stock on Amazon
- Because it bundles two different-capacity batteries, we don't collapse that into one capacity number — check the listing for the exact 2.0Ah/4.0Ah split
- We haven't run our own runtime tests; capacities are Ryobi's stated ratings
Our Verdicts
Milwaukee M18 REDLITHIUM 5.0Ah Battery (48-11-1850)
A genuine Milwaukee M18 pack is the safe first buy for anyone standardized on the M18 platform — real Milwaukee chemistry and the full manufacturer warranty, not a third-party guess.
RYOBI ONE+ 18V Lithium-Ion Starter High Performance Kit with 2.0 Ah Battery, 4.0 Ah Battery, and Charger
A genuine Ryobi kit that pairs a compact 2.0Ah pack with a higher-capacity 4.0Ah pack and one charger — solid value for ONE+ owners who want both a light pack and a runtime pack.
RYOBI ONE+ 18V Lithium-Ion Starter High Performance Kit with 2.0 Ah Battery, 4.0 Ah Battery, and Charger
$97
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