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Replacement Box with Non-LED Lid for Engager Breakaway Kit

Replacement Box with Non-LED Lid for Engager Breakaway Kit

Item # HM20120
Our Price: $14.96
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Hopkins Battery Box Accessories and Parts - HM20120
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Replaces the battery box for your Hopkins Engager Breakaway kit (20099). 1-833-496-1390 to order Hopkins accessories and parts part number HM20120 or order online at Free expert support on all Hopkins products. Great prices and Fastest Shipping for Replacement Box with Non-LED Lid for Engager Breakaway Kit. Accessories and Parts reviews from real customers.
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  • Reviews (25)
  • Q & A (0)
  • Videos (1)
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Hopkins Accessories and Parts - HM20120

  • Trailer Breakaway Kit
  • Battery Box
  • Hopkins

Replaces the battery box for your Hopkins Engager Breakaway kit (20099).


  • Replaces the battery box for your Hopkins Engager Breakaway kit (20099)
  • Outside dimensions: 4-1/8" long x 5-5/8" wide x 5-1/8" tall
  • Inside dimensions: 4-1/2" long x 4" wide x 3-1/2" deep

20120 Replacement Box with Non-LED Lid for Engager Breakaway Kit

California residents: click here

Video of Replacement Box with Non-LED Lid for Engager Breakaway Kit

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Hopkins Trailer Breakaway Kit HM20120 Review

Speaker 1: Today, we're taking a look at the replacement box with a non-LED lid for the Engager breakaway kit. This is designed to fit the Engager breakaway kit, part #20099. Really, it's just a battery box, so it's a nice durable plastic construction. Has the mounting tabs on the bottom. Mounting hardware not included. Has the lid that snaps shut.

You can easily open it, gain access to the battery. It does have the hole on the bottom, so that way, if anything gets in the box, it does have a way to escape, moisture and dirt, that type of stuff. The lid is lockable. Two little holes there. That way, you can lock it to add security.

A lock is not included.Basically, with this video, what I want to do is I just want to go over the measurements of the box. I took measurements of the box with it all closed up, so the external measurements. Edge to edge, this direction, I got a measurement of about 5 1/8". Overall height is about 4 1/8". Front to back, the widest measurement is at the mounting tabs.

If we measure from this mounting tab, the edge of it to the edge of this mounting tab, it's about 6 1/4". Now, the mount holes right here, these are separated on center by 3", and then these mount holes are separated from this one on center at a straight line measurement by about 5 1/2". Mount hole diameter's 1/4".Internally, we took some internal measurements as well. At the bottom of the box it measures 4 1/4" wide by 4" front to back and 3 1/4" tall. At the top, here at the opening, it's 4 11/16" wide by 4 3/8" front to back.

That's going to do it for today' look at the replacement box with non-LED lid for the Engager breakaway kit.

Customer Satisfaction Score:

Customer Reviews

Replacement Box with Non-LED Lid for Engager Breakaway Kit - HM20120

Average Customer Rating:  5.0 out of 5 stars   (25 Customer Reviews)

Replaces the battery box for your Hopkins Engager Breakaway kit (20099).


I received the shipment earlier than expected in great shape. The HM2010 replacement battery boxes (I bought 3) will be used to hold UB 1250 batteries for my game cams . I realize this is an unusual application but these are ideal boxes for this purpose as they can easily be mounted with the cameras with bungee cords (or screws for more permanent locations) and protect the batteries from the elements.

The HM2010 battery boxes are working very well after one year in my game cam application and have served well in all weather conditions including snow burial during the winter months!!!
jomac - 01/27/2015


Great replacement for a broken box. Mine got stepped on and broke off at the bolt ears. The box will easily work with the LED front/door, as well, as long as you are replacing the same model box ... as I was. Simply snap the plain door off and snap the LED one on. Works great and is just like my original that came on my Leonard trailer.

Still working fine, as the day I put it on the trailer.
Jesse G - 06/14/2018


Hopkins Factory Replacement for their Engager breakaway electric brakes system without built in battery charger, OR to replace a broken battery box on a system WITH charger by simply unsnapping the new lid and replace it with the old lid with charger. Saves quite a few bucks, and the typical failure point on these is the mounting feet eventually crack/break after lots of rough road hauling or stepping on the unit by accident. Simple installation.
Use this item IF you need only a battery box, and save some bucks. Hopkins does not, that I have found, offer just an empty battery box with no lid, but this unit is cheap enough to toss the unneeded plain lid and not lose any sleep.
NOTE: I cover mine with a cheapo plastic bucket held on with a small bungee to extend life of the unit by letting the sun's UV eat the bucket, not the Engager box.


I use the box to house a RV battery cut-off switch. Keeps the switch dry, can be locked as the top of the switch can be removed. I brought my RV in for some warranty work, and he was impressed with the use of the box to house the switch. Made for a clean install. Fantastic product.


This was great replaced the broken one with no problem. This was the first time that I ordered from etrailer and just like J.D. from BTBRV said that you are the best on getting parts replaced or buy. Thank you so much for all you do.


The box worked perfectly for what I needed. With a tongue mounted toolbox, a top loading battery box for the breakaway kit is not feasible, and this worked perfectly.


Very nice box to hold a standard battery. No instructions, but after looking at it for a while, you figure out the battery goes in on its' side, and the terminal lugs go on the side with the shorter reinforcing fins. Very sturdy box, and the lid closes securely.


Product was exactly what I needed. Website had great information. Made it easy to find the parts I required for my trailer repairs. Pricing was competitive and parts must have shipped immediately. I had the parts in just a few days.



Excellent quality,fit battery perfect ,easy to install,just what I needed,delivered in two days,very good service,would recommend to others,will use your company again


Had to replace this after my original box broke. It lasted about two years then the plastic mounting tabs cracked and fell off.


The battery box is exactly what I expected. Delivery was fast!


Great product. Delivered on time and in great shape.

Parts are working great
Keith Y - 11/11/2017


All products were excellent.


Worked perfectly. Great value. Fast service. Thank you.


Great product. Well built. Great customer service and fast shipping.







arrived in perfect condition







See what our Experts say about this Hopkins Accessories and Parts

  • Dimensions of the Hopkins Replacement Battery Box with Non-LED Lid for Engager Breakaway Kit
    The dimensions for the Replacement Box with Non-LED Lid for Engager Breakaway Kit, # HM20120, are: Bottom Inside 4-1/4 inches wide x 4 inches front to back x 3-1/4 inches tall Top Inside 4-11/16 inches wide x 4-3/8 inches front to back Outside Overall 5-1/8 inches wide x 6-1/4 inches front to back x 4-1/8 inches tall I have also made a short video showing the dimensions.
    view full answer...
  • Battery Box for Breakaway Battery
    We do indeed have a battery box that's specifically designed for that battery. The part number is # HM20120. You can see current pricing by clicking the provided link. The box can be ordered online by using the provided link.
    view full answer...
  • Do You Carry A Replacement Box For Engager Trailer BreakAway Kit Part # 20099
    Yes, I contacted our representative at Hopkins and he informed me that the replacement box that you will need is the Engager Trailer Breakaway Kit part # HM20120. Part # HM20120 also includes a lid, but is interchangeable with the LED lid that you have.
    view full answer...
  • Replacement Trailer Battery Box Recommendation
    If all you need is a replacement battery box you could get a Replacement Box with Non-LED Lid for Engager Breakaway Kit, part # HM20120, or the LED version # HM20121.
    view full answer...
  • Replacement Breakaway Battery Box for Battery Dimensions 5.94 x 3.86 x 3.86-Inches
    Based on your dimensions it sounds like you need a box for a trailer breakaway battery. All of the replacement breakaway battery boxes we offer can be seen on the link provided. For example, the inside of part # TK2018 measures 5-3/8 L 3-1/16 W 4-3/4-inches H. This box also has small divider inside as shown in the linked photo. It seems your battery is a bit larger in at least one dimension than most that we offer, so if needed you can use a box for a larger battery, such as one of those...
    view full answer...
    Image 1 for
  • Selecting a Breakaway Battery and Box for a 12,000 Pound Dual Axle Trailer Towed by a 2010 Titan
    When replacing the battery on your trailer, I would recommend using a 12 volt 5 amp hour battery like the Breakaway Kit Replacement 12 V Battery, item # HM20008. The brand of battery is not particularly important as long as your system does not have special features like a lid with charge indicators. Once you have selected a battery you will need to select a battery box to protect the battery from the elements and secure it to the trailer. We have the Replacement Box with Non-LED Lid for...
    view full answer...
  • What are the Options for Adding a Trailer Battery Box to a Trailer
    We do have several battery boxes, but none with the exact dimensions you have listed. We have smaller break away battery boxes like the Replacement Battery Box for Breakaway Kit, # 34420215, which will accept a battery that is 3-1/2 inches x 2-3/4 inches and 4 inches tall. And the Hopkins box you have referenced is 5-5/8 inches Wide x 5-1/8 inches Tall x 4-1/8 inches Deep. But we also have larger battery boxes which I have listed below. Battery Box Vented - U1, # DW03188: 10-1/2 inches...
    view full answer...
  • Can Trailer Breakaway Battery Be Mounted on It's Side
    If you are using a breakaway kit like the Hopkins Engager Trailer BreakAway Kit # 20099 that features a sealed battery in an enclosure then you can mount it sideways if that is a better mounting solution on your trailer. We do often see trailers with their breakaway battery installed in this way. If your kit does not use a sealed battery or if it does not have a protective case for the battery you might want to check the manufacturer's instructions for any cautions about how that particular...
    view full answer...
  • What Size is the Battery Box in Tekonsha Push to Test Breakaway Kit, # 50-85-313
    The Tekonsha Push to Test Breakaway Kit, # 50-85-313, is large enough to house a 12 volt battery like # UB1250, which is 3-1/2 inches x 2-3/4 inches x 4 inches. The box will be slightly larger then this in order to accommodate the battery. The box is this particular kit is not available as a stand alone item, but we do have others that are. Take a look at the Replacement Battery Box for Breakaway Kit, # 34420215. This box will be the same size as the one listed above. We also have Replacement...
    view full answer...

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Info for this part was:

Employee Michael H
Expert Research:
Michael H
Employee Adam R
Expert Research:
Adam R
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C

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