Model#: MILN211121

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Milwaukee 2111-21 USB Rechargeable Hard Hat Headlamp

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  • Milwaukee 2111-21 USB Rechargeable Hard Hat Headlamp
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High Output. Secure Attachment. Powered by REDLITHIUM USB, the Milwaukee USB Rechargeable Hard Hat Headlamp delivers 475 lumens of TRUEVIEW High Definition output, and is capable of all-day runtime, over 2,000 recharges and 3X faster charging via USB. Optimized for use with hard hats, its slip resistant strap and clips provide easy and secure attachment. A water, dust and drop resistant body and lens allows it to withstand the toughest conditions. Get maximum control over output, beam coverage and runtime with five different modes, flood, spot and spot/flood beam patterns, and up-to 31 hours of runtime. The REDLITHIUM USB Battery can be recharged in the light via Micro USB or swapped out with additional REDLITHIUM USB Batteries for virtually no downtime. The Milwaukee USB Rechargeable Hard Hat Headlamp is covered by a limited lifetime warranty.
  • 475 Lumens of TRUEVIEW High Definition Output
  • Clips and Rubber Grip for Secure Hard Hat Attachment
  • IP54 Rated: Water and Dust Resistant
  • Flood, Spot and Spot/Flood Beam Pattern Options
  • 5 Light Output Modes for Optimal Brightness and Runtime
  • Spot/Flood Mode: 475 Lumens- 2 Hrs. Flood High Mode: 300 Lumens- 4.5 Hrs. Flood Medium Mode: 150 Lumens- 8.5 Hrs. Flood Low Mode: 25 Lumens- 31 Hrs. Spot High Mode: 300 Lumens- 4 Hrs.
  • 7-Position Tilting Light Head for Directing Light
  • Internally Charges REDLITHIUM USB Batteries through Micro-USB Port
  • 3X Faster Charge Time: 2.1A Charge Rate
  • Get 50% of a Charge in Under 30 Minutes, 80% in Under 1 Hour, and a Full Charge of the REDLITHIUM USB Battery in 2 Hours
  • USB Rechargeable Hard Hat Headlamp - 2111-21
  • REDLITHIUM USB Battery - 48-11-2130
  • 2 ft. Heavy Duty Micro-USB Cable
  • (4) Removable Hard Hat Clips


Cordless: Yes
Length: 2.21 in.
Weight: 0.41 lbs.
Amp Hour: 2.5 Ah
Batteries Included: 1
Battery System: REDLITHIUM USB
Battery Type: Li-Ion
Battery Warranty: 2 Year
Bluetooth Compatibility: No
Bulb Type: LED
CSA Safety: No
Case Included: No
Charge Time: 2 hr
Charger Included: Yes
ETL Safety: No
Lumens: 475
No. of Bulbs Required: 3
Powered Tool Power Source: Electric - Cordless
UL Safety: Yes
Voltage: 4V
Wifi compatibility: No



4.6 / 5.0
12 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Yes, I would recommend this to a friend (4)
Easy To Use (5)
Powerful (5)
Lightweight (2)
Ergonomic Design (1)
Heavy (3)
Short Run Time (if applicable) (1)
Best Uses
Frequent Use (3)
Small Projects (2)
Jobsite (2)
Large Projects (1)
Im really happy with the 5 ive bought so far
Ive buying them slowly for the plant employees where i work. Each time one of the old ones break i replace it with one of these and an additional battery/ charger kit. So when any one of the plant guys lights needs a battery they just swap it with one in a charger. Most of the guys use it on high so they battery life is kind of short but thats expected and why i bought the spares. Still they only have to swap batteries every couple days. With a 2000 cycle life span frequent swapping wont be an issue for a long time.
As for function, I use mine as a mobile work light and headlamp. You can remove it from its plastic mount and sit it where you need it. Im not sure if its meant to be that way but im careful and its worked perfectly at least 100 times. Its been about 9 months to a year since i bought mine (the first one at the plant and i still havent found any major flaws. One weak point is the battery life if used on high flood (approximately 2 hours) all of the time. My resolution is the spare battery and charger kit which is fully charged in that amount of time. So i dont see that as much of a weak point. just get the kit and you have a great work light for around $100.
May 3, 2019
Originally posted at
Yes, I would recommend this to a friend
Easy To Use
Best Uses
Frequent Use
Small Projects
I use without a hardhat!
I use primarily at night to wander outside with dogs to avoid skunks and make sure sheds are closed/locked. I'm surprised at the intensity and amount of light it provides. Also comfortably fits my size 8 1/2 head without a hardhat.
April 24, 2019
3 months ago
Describe Yourself:
Yes, I would recommend this to a friend
Easy To Use
Short Run Time (if applicable)
Best Uses
Small Projects
Although I would recommend this device with reservations, the battery like is lacking severely and is bulky,
March 13, 2019
4 months ago
Describe Yourself:
Bright, fits well. Clips are sub par.
I use this light on my hardhat,and the clips are great for that. The light is bright, and the settings are versatile enough for many tasks. The only complaint I have is the clips. After a few months use, the hinges no longer hold the lamp in position. I sometimes have to slope the light higher or lower depending on what I'm doing, but the light no longer stays where I place it. The price is high to have to replace it every few months for this wear and tear.
February 9, 2019
Originally posted at
I work at night
I’m a miner! Thank you Milwaukee for getting this one right .
January 20, 2019
Originally posted at
Deffinantly worth the buy.
I have been using this light for all my mechanic work on semi's. I work over 12 hour shifts most of the time and the only down fall is not having a spare battery for when I need it. I wish Milwaukee would make a external charger and sell on with 2 batteries so you can always keep working. Other than that, i would recomend anyone this light.
January 16, 2019
Originally posted at
Yes, I would recommend this to a friend
Easy To Use
Best Uses
Works well...bright and easy to recharge
December 30, 2018
7 months ago
Describe Yourself:
Super bright. great features
very easy to use, only 2 buttons.

one button is on/off. the other changes the mode.
if its flashing at you that means the battery is low which is a great feature,
on the bottom by the charger itll have green/orange/red for the first couple seconds you turn it on so you know how much life is left.

really wide angle on the flood settings.

would recommend, i even wear it straight on my head without the hardhat, its not too uncomfortable, maybe just put a toque or headband underneath if you need.
November 17, 2018
Originally posted at
great light. Simple, bright and sturdy
Great amount of light and easily adjustable settings.
Really like the rechargability.
...and would LOVE Milwaukee to include a peel and stick neoprene pad for non-hardhat users! Still, excellent unit.
November 16, 2018
Originally posted at
Yes, I would recommend this to a friend
Easy To Use
Best Uses
Frequent Use
Large Projects
Perfect headlamp good light
September 11, 2018
10 months ago

Questions & Answers

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Browse 10 questions Browse 10 questions and 12 answers
Can the headlamp be worn comfortably without using it with a hardhat?
James G on Dec 8, 2017
BEST ANSWER: Yes, It is very comfortable. I do not use a hard hat.
Can I use it without hard hat?
A shopper on Nov 13, 2017
BEST ANSWER: Yes you can use it with hard hat
can i get additional battery?
A shopper on Jan 30, 2018
BEST ANSWER: Yes batteries are sold separately.
Once a mode is selected, can the light be turned on and off without cycling through other modes?
A shopper on Dec 31, 2018
BEST ANSWER: Yes, you can turn off the light without cycling through modes.
Are they intrinsically safe?
Francisco C on May 14, 2019
BEST ANSWER: Your question will be best answered by the manufacturer, who can provide you with the accurate information. The number to reach the technician is 1-800-729-3878.
Do you charge the battery in the light itself or is there a external charger for the battery?
MikeR on Jan 27, 2019
BEST ANSWER: Model 2111-21 internally charges the REDLITHIUM USB Batteries through Micro-USB Port.
Can we get replacement strap?
Pinoydad on Jan 17, 2019
BEST ANSWER: Yes, the model number for the replacement straps are 45-56-0085.
Can this be used with a full brim hard hat as well?
A shopper on Oct 7, 2018
BEST ANSWER: Yes, the item has a Rubber Grip for Secure Hard Hat Attachment.
Is it intrinsically safe?
A shopper on Jan 12, 2018
can this lamp be used without a hardhat?
asher l on Dec 7, 2017
BEST ANSWER: Yes it can be used without a hard hat