Milwaukee is adding the most capable charger in its lineup this summer. The M18 & M12 Four Bay Simultaneous Super Charger (model 48-59-1818) launches at Home Depot on June 29, 2026.
What This Charger Does
The 48-59-1818 charges four batteries at the same time. The bay layout is two M18-only bays and two hybrid bays that accept either M18 or M12 batteries — so a crew running both platforms can run a single charger at the job site.
The key spec: four M18 REDLITHIUM FORGE HD12.0 batteries (12.0Ah) go from dead to 100% in 90 minutes. That uses Milwaukee’s CHARGE ADAPT technology, which distributes power dynamically across all four bays based on each battery’s current state. This isn’t splitting a fixed wattage four ways — the charger actively manages output per bay to maximize total throughput.
Key Features
- Bays: 2× M18 + 2× M18/M12 hybrid (4 total simultaneous)
- Charge time: 4 × HD12.0 to 100% in 90 minutes
- CHARGE ADAPT: Adaptive power distribution across bays
- COOL-CYCLE compatible: Works with Milwaukee’s active battery cooling system
- PACKOUT compatible: Mounts directly on the PACKOUT modular system
- Carry handle: Built-in for truck-to-jobsite transport
- Battery compatibility: All M18 and M12 REDLITHIUM batteries
Who This Is Built For
If you have one or two tools, your current charger is fine. This is built for crews — electricians, framers, remodelers — who burn through multiple M18 packs in a day and are currently juggling a lineup of dual-bay chargers to keep up. Consolidating to a single PACKOUT-mounted unit that charges four batteries simultaneously eliminates charging logistics as a bottleneck.
The COOL-CYCLE compatibility matters for hot-weather work. Continuous charge cycles generate heat that shortens battery lifespan. COOL-CYCLE runs a cooling phase before charging on batteries that are too warm — the charger handles this automatically, no intervention needed.
Pricing and Availability
Milwaukee hasn’t announced retail pricing yet. Their existing Dual Bay Simultaneous Super Charger lists at $149, so expect this to land above that. It will be available exclusively at Home Depot starting June 29.
For context on whether M18 makes sense as a primary platform, our battery platforms comparison breaks down Milwaukee, DeWalt, and Makita for battery cost, charging infrastructure, and tool selection. For current M18 kit picks, see the pro combo kit guide. And if you’re comparing Milwaukee vs DeWalt head to head, our Milwaukee vs DeWalt drill comparison covers the key trade-offs between the two platforms.
