Milwaukee’s 48-59-1818 Four-Bay Super Charger accepts M18 and M12 packs and can charge up to four batteries simultaneously, with Packout compatibility, Cool-Cycle support for Forge packs, and a five-year warranty.
Design: Packout-compatible with a carry handle and Cool-Cycle support for Forge 8.0Ah and 12.0Ah batteries that have cooling vents.
Price and support: MSRP $499 and backed by a five-year warranty.
Milwaukee's M18 & M12 Four-Bay Super Charger (model 48-59-1818) is a workplace-focused charger that handles both the M18 and M12 battery systems at the same time. It is aimed at crews or technicians who regularly cycle multiple packs across the two Milwaukee platforms and need faster, higher-capacity simultaneous charging than previous multi-bay options.
The unit has four physical bays: two dedicated M18-only bays and two hybrid bays that accept either M18 or M12 packs. That means you can charge up to four M18 batteries at the same time, or mix two M18 and two M12 packs simultaneously. Milwaukee says the charger uses Charge Adapt Adaptive Charge Distribution to spread available power across active bays.
Milwaukee publishes recharge estimates for common pack types when using all four bays:
Cool-Cycle is supported but only for Forge batteries that include vented housings—specifically the Forge 8.0Ah and 12.0Ah packs. The charger can push air through those vented packs to help keep temperatures down during fast charging. Other M18 and M12 packs are compatible for charging, but they won't use Cool-Cycle.
The suggested retail price is $499. Milwaukee backs the unit with a five-year warranty.
This charger is most useful for teams that run both M18 and M12 tools and need simultaneous charging for multiple packs to reduce downtime. It's a higher-cost, higher-productivity tool that makes sense for crews that regularly wait on batteries. Occasional users who already manage with smaller chargers may not find the price easy to justify.
If you need to charge multiple Milwaukee packs quickly and want the flexibility to mix M18 and M12 batteries in the same charging station, the 48-59-1818 Four-Bay Super Charger provides simultaneous four-bay charging, Cool-Cycle support for vented Forge packs, Packout compatibility, and a five-year warranty at a $499 price point.
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