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M18 top-off BIDIRECTIONAL CHARGER & POWER SUPPLY – REVIEW
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Milwaukee M18 TOP-OFF Bidirectional Charger & Power Supply Review
Pub Test Products — Tried, Tested & Told Straight
Milwaukee’s New TOP-OFF: Cracks On While You Crack One Open.
If you’ve been stuck with dead batteries for your phone and drill, Milwaukee’s new M18 TOP-OFF Bidirectional Charger & Power Supply (M18BC) solves that problem. This compact, smart charger keeps both tools and tech powered up without extra gear.
Milwaukee marketing pitch. I definitely got sucked in
Milwaukee calls it their most compact M18 charger yet — 65 percent smaller than the standard M12-18 Fast Charger — but still powerful enough to deliver 115 watts of continuous power through dual USB-C ports (100 W PD + 15 W).
Designed for tradies, foremen, and anyone using M18 batteries who can’t afford downtime, it delivers efficient, reliable recharging.
Pair it with the included 65 W wall adaptor and you’ll recharge a 5.0 Ah M18 pack in about 105 minutes. Step it up with the upcoming USBC100 100 W wall adaptor, which drops the time to roughly 75 minutes — about 30 percent faster.
Might little thing. Loving the passthrough power design.
Out on site, this little unit actually lives up to its marketing. It’s smaller than your little lunch box, weighs next to nothing (around 460 grams), and fits neatly in the side pocket of your tool bag.
Plug your M18 battery into one side, and your phone or laptop into the other, and both will charge at the same time thanks to the clever passthrough power design.
We ran it for a week, charging phones, tablets, even a USB-C site radio, all while topping up an M18 5.0 Ah pack.
No heat issues, no drop-outs — just solid Milwaukee build quality.
For supervisors or anyone bouncing between sites, it’s a no-brainer bit of kit.
No power point?
The M18 TOP-OFF converts any M18 battery into a portable tech charger, keeping your devices powered up wherever you go.
Specs that Matter
* Output Power: 100 W PD + 15 W USB-C
* Charge Time (M18 5.0 Ah): 105 min (65 W Adaptor) | 75 min (100 W Adaptor)
* Passthrough Charging: Yes – battery + device simultaneous
* Weight: 0.46 kg (Charger only)
* Warranty: 2 Years
Pub Test Verdict...
They call it the TOP-OFF — and yeah, it’s not the kind you take off a coldie, but it’ll keep your gear running till you can.
We’ve all got a tangle of chargers at home — one for the laptop, one for the drill, a different one for the phone. This thing cuts the clutter.
It’s proper job-site gear — rubber over-moulded, vented for cooling, and designed to cop with a bit of rough handling. It’s not a gimmick. It's a genuine productivity boost if you’re running Milwaukee cordless.
The only downside? You’ll prob end up guarding it like your lunch. Once the crew sees it can fast-charge their phones and their M18s, it’ll walk quicker than a 6 pack on a Friday arvo.
Ticks...
Compact and powerful
Charges battery + device simultaneously
Perfect for foremen, mobile techs & site supervisors
⚠️ The 100 W wall adaptor (for full speed) will be available in February 2026
Pub Test Score: 9/10. Keeps your gear going and your day on track.
Find it at RED SHED. Only just released. Pre-Orders Welcome. See us instore. Online soon.
🛒 Shop the Milwaukee M18 TOP-OFF Bidirectional Charger at Red Shed
📦 SKU: M18BC | EAN: 4892210255266
⚙️ Compatible with all Milwaukee M18 batteries and USB-C devices.
That's it from me.
Cheers - Craig.
Facts in a flash...
A: Yep — that’s the whole point. The M18 TOP-OFF has passthrough power, so you can charge an M18 battery through the 100 W USB-C PD port while also powering or charging a USB-C device through the 15 W port at the same time. Perfect for phones, tablets, or even laptops on the go.
A: With the included 65 W wall adaptor, it’ll charge an M18 5.0 Ah battery in around 105 minutes. Pair it with the new 100 W wall adaptor (USBC100) and that drops to about 75 minutes — 30% faster.
A: Pretty much anything that uses USB-C, including phones, laptops, tablets, wireless headphones, site radios and Milwaukee’s own internal rechargeable gear.
A: Yes — it’s part of the M18 platform, so it works with all Milwaukee M18 batteries.
M18 TOP-OFF Bidirectional Charger & Power Supply
65 W USB-C Wall Adaptor (USBC65)
900 mm USB-C to USB-C cable
2-Year Warranty
A: The USBC100 100 W Adaptor launches February 2026 and will be sold separately. It’ll give you faster charge times and dual USB-C output (100 W + 20 W).
A: Just 0.46 kg, and about the size of a tape measure — Milwaukee’s most compact M18 charger to date.
Milwaukee backs the M18 TOP-OFF and the USBC100 adaptor with a 2-year warranty.
