This is a 2-pack of the Milwaukee 48-11-1850R M18 REDLITHIUM XC5.0 Resistant Battery — two identical battery packs, model 48-11-1850R, bundled together in a single listing.

The 48-11-1850R is built with a resistant housing that provides increased protection against exposure to common oils, greases, and solvents found in automotive and manufacturing environments, while still delivering the same best-in-class performance as the standard Milwaukee M18 REDLITHIUM XC5.0 battery: up to 2.5X more runtime and 20% more power than standard lithium-ion batteries. Each pack is built for heavy-duty use, runs cooler, and performs in cold-weather climates. Milwaukee's REDLINK Intelligence protects the battery from overloads through total system communication between tool, battery, and charger, and discharge protection helps prevent cell damage. An integrated temperature management system and individual cell monitoring help maximize each battery's life, and an onboard fuel gauge shows remaining runtime. Both packs are fully compatible with all 200+ Milwaukee M18 solutions.

This 2-pack makes sense for users running Milwaukee M18 tools in shops or jobsites where batteries regularly get exposed to oil, grease, or solvents — automotive maintenance, manufacturing, and general repair environments — and who want two of the same resistant-housing battery on hand instead of mixing battery types or placing two separate orders.

Two Resistant-Housing Batteries, Ready When You Need Backup

Same model, twice — an easy way to keep a resistant-housing M18 battery in reserve without hunting down a second listing.

• Who it's for: Milwaukee M18 users in oil, grease, or solvent-heavy environments — automotive shops, manufacturing, general maintenance — who want two of the same resistant-housing battery instead of mixing battery types.
• Why it stands out: Both packs carry the same 2.5X runtime, 20% more power, and resistant-housing protection as the single unit — nothing is traded off to get two.
• Worth knowing: This 2-pack is priced at $418.00, which is $140.00 above the $278.00 you'd pay buying two PROMO 48-11-1850R units separately at $139.00 each — this listing carries a premium over component cost, not a savings bundle. No charger is included. The component SKU also carries "PROMO" and is tied to a promotion running through 11/1/2026 — its price or availability may change after that date.

• Do these two batteries come with a charger? No, this 2-pack includes two bare battery packs only — no charger.
• What's the voltage and capacity? Each pack is an 18V Milwaukee M18 REDLITHIUM XC5.0 battery.
• Why choose the resistant-housing version? Milwaukee builds this pack's housing with extra protection against oils, greases, and solvents found in automotive and manufacturing environments, on top of standard all-weather performance.
• Is this priced lower than buying two separately? No — this 2-pack is priced at $418.00, which is $140.00 above the $278.00 you'd pay buying two PROMO 48-11-1850R units separately at $139.00 each.