The Milwaukee 48-59-1812 is Milwaukee’s M18 Rapid Charger — a single-port M18-only charger designed for faster charge times than the standard 48-59-1808. It delivers a higher charge current to M18 batteries, bringing charge time for a 6.0Ah battery down from ~75 minutes to approximately 60 minutes. It is compatible with all M18 REDLITHIUM batteries but does not have an M12 port.
48-59-1812 Specifications
| Specification | Value |
|---|---|
| Part Number | 48-59-1812 |
| Compatible Platform | Milwaukee M18 only |
| Ports | 1 × M18 |
| Input | AC 110–120V, 60 Hz |
| Charge Time — M18 2.0Ah (CP) | approx. 20 min |
| Charge Time — M18 4.0Ah (XC) | approx. 40 min |
| Charge Time — M18 5.0Ah (XC) | approx. 50 min |
| Charge Time — M18 6.0Ah (HO) | approx. 60 min |
| Charge Time — M18 6.0Ah (FORGE) | approx. 60 min |
| LED Indicator | Yes — charge progress + fault |
| REDLINK Intelligence | Yes |
| Weight | approx. 355 g / 0.78 lbs |
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Battery Compatibility
The 48-59-1812 is compatible with all batteries in the Milwaukee M18 platform, including CP (Compact), XC (Extended Capacity), HO (High Output), and FORGE battery generations. It does not accept M12 batteries — for M12 charging you need the 48-59-1808 or the dedicated 48-59-2401 M12 charger.
| Battery Model | Capacity | Approx. Charge Time (48-59-1812) |
|---|---|---|
| 48-11-1820 | 2.0 Ah (CP) | approx. 20 min |
| 48-11-1828 | 2.8 Ah (CP) | approx. 30 min |
| 48-11-1840 | 4.0 Ah (XC) | approx. 40 min |
| 48-11-1850 | 5.0 Ah (XC) | approx. 50 min |
| 48-11-1860 | 6.0 Ah (HO) | approx. 60 min |
| 48-11-1862 (FORGE) | 6.0 Ah (FORGE) | approx. 60 min |
48-59-1812 vs 48-59-1808 — Which Should You Buy?
Choose the 48-59-1808 if you use both M18 and M12 tools — it’s the only way to charge both platforms from one charger. Choose the 48-59-1812 if you only use M18 and want faster charge times. The 1812 charges a 6.0Ah M18 battery approximately 15 minutes faster than the 1808, which matters when you’re running tools hard and cycling batteries frequently. Many tradespeople keep one of each: a 1808 for the van overnight (to cover M12 tools) and a 1812 on the charger for rapid battery rotation during the day.
Does the 48-59-1812 Charge M12 Batteries?
No. The 48-59-1812 has a single M18-only port. It will not accept or charge M12 batteries. For simultaneous or single-charger coverage of both platforms, use the 48-59-1808.
Specifications reflect standard production variants. Always verify compatibility with your specific battery model before purchase. For the most current product information, visit the manufacturer’s official website.