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Replacement Bolt-On Battery Box for Tekonsha Trailer Breakaway Kit

Replacement Bolt-On Battery Box for Tekonsha Trailer Breakaway Kit

Item # TK2051
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Accessories and Parts TK2051 - Battery Box - Tekonsha
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Lockable, plastic box keeps the battery and charger of your trailer breakaway system protected from the elements. Tab-style mounting piece is built in. 1-800-940-8924 to order Tekonsha accessories and parts part number TK2051 or order online at Free expert support on all Tekonsha products. Guaranteed Lowest Price and Fastest Shipping for Replacement Bolt-On Battery Box for Tekonsha Trailer Breakaway Kit. Accessories and Parts reviews from real customers.
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  • Reviews (94)
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Tekonsha Accessories and Parts - TK2051

  • Trailer Breakaway Kit
  • Battery Box
  • Tekonsha

Lockable, plastic box keeps the battery and charger of your trailer breakaway system protected from the elements. Tab-style mounting piece is built in.


  • Replacement battery case guards your breakaway battery and charger from the elements
    • Designed for use with Tekonsha trailer breakaway kits
  • Lockable design deters theft
    • Padlock sold separately
  • Heavy-duty polymer construction resists corrosion
  • Integrated tab-style mounting bracket lets you mount case almost anywhere


  • Application: batteries that measure 3-3/4" long x 3" wide x 4-1/2" tall or 5-3/4" long x 3" wide x 3-1/2" tall
  • Overall inside dimensions: 5-15/16" long x 3-1/8" wide x 5-1/2" tall
  • Overall box height: 6-1/8"
  • Measurement from center to center of mounting holes: 7-1/8" long x 3-3/16" wide

2051 Tekonsha Lockable Battery Case - Tab Mount

California residents: click here

Video of Replacement Bolt-On Battery Box for Tekonsha Trailer Breakaway Kit

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

Video Transcript for Tekonsha Trailer Breakaway Kit TK2051 Review

Today we're going to be taking a look at the bolt on battery box for breakaway kits. The battery case is going to guard your breakaway battery and charger from the elements. This is designed for use with the Tekonsha trailer breakaway kits, but it will also fit many other batteries. To open it up you just pry this side open, it's got the plastic tether strap on this side so it keeps the lid attached. Taking a look on the inside, you can see down at the bottom that it does have some supports, that's designed to keep the battery off the base of the box, or off the floor of the box. It's also going to have holes in the base of the box to prevent moisture buildup, and then here on the backside, when the case is closed, you'll see that it has this small little slot right there so that's going to give you room to run the wires out of the box. It does feature a lockable design, it's got a tab right here with a small hole in it. That hole's going to measure a quarter of an inch so it will accept a padlock that has a quarter inch diameter shackle.

Padlock is going to be sold separately, but again it does have that lockable design to help deter theft. It's made from a heavy duty polymer construction to resist corrosion and for strength and durability. Here on the backside it's got the mounting tabs, that's these two tabs right here, each tab's going to have two holes so it's going to have a total of four holes, that way you can mount the case almost anywhere. Hardware is not included. The product is made in the USA. When it comes to the internal dimensions, that's going to measure five and fifteen sixteenths of an inch long by three and one eighth of an inch wide by five and a half inches tall.

The overall height of the box is going to measure six and one eighth of an inch. The overall width . I am including the mounting tabs in this measurement, so outer edge to outer edge it's going to give us an overall width measurement of about seven and three quarters of an inch. From front to back it's going to give us a depth measurement of right around four inches. Taking a look at the mounting holes, here on top these holes are going to be separated apart from one another on center by about seven and one eighth of an inch. Here at the bottom that measurement decreases just a little bit by about an eighth of an inch, so center on center, those are separated by about seven inches.

Going up and down, we're going to have a hole separation on center by right on three inches. That's going to do it for today's look at the bolt on battery box for breakaway kits.

Customer Reviews

Replacement Bolt-On Battery Box for Tekonsha Trailer Breakaway Kit - TK2051

Average Customer Rating:  4.8 out of 5 stars   (94 Customer Reviews)

Lockable, plastic box keeps the battery and charger of your trailer breakaway system protected from the elements. Tab-style mounting piece is built in.


Used for stowing assembly and wiring for front parking sensors for my F150.
Provides for organization and protection from the elements.


Great product. I repurposed this as an APU for my enclosed trailer. It powers my LED lights when I'm not connected to my tow vehicle. So I have lights inside all the time.


I bought this to house a 12v 10 amh battery for my fish finder. It was well constructed but was a little small for this battery. I was able to stretch it out by heating it and inserting a wood block slightly bigger than the battery. It fit well after that.


Installation could not have been simpler. Easy out with the old, on with the new, it was a perfect fit. Very pleased with everything from etrailer! Thanks!!!


Sorry I didn't see it yet I'm not home catch up later


Very fast delivery, under a week from the time I ordered! The trailer break away box is perfect for what I need, I will be a repeat costumer. Recommend this company!


Perfect Fit ... Made Possible by GREAT Dimensions in the Description. It is 100% BETTER QUALITY than the original equipment. ANOTHER wonderful purchase from my friends at e-trailer!


Worked great replacing the one that was full of holes after installing the junction box.


Perfect for the application I needed it for. Accurate description was extremely helpful otherwise I wouldn’t have purchased. I needed specific measurements and they were provided. Great price and shipping was faster than I had expected.


Used it for a fish finder battery in a small plastic pontoon boat worked perfectly.


This is exactly what I needed for a 12 volt battery to go in my kayak for a fishfinder. I will have to grind off a little plastic on the inside to make it fit but next to nothing on the internet was out there but this nice little box that would fit the battery inside.

Still quite durable and does the job
Jason S - 07/16/2017


The box itself is exactly what I had been looking for, and the purchasing process went smoothly. However, given the box is intended to be fastened to the frame of a trailer, it would have been appreciated if the hardware—4 self-tapping screws—was included. The package of screws I needed to purchase—only to use 4—cost more than the box. Tough to find just 4 screws these days since the mom and pop stores have been pretty much squeezed out. Not looking for a freebie...just add it to the cost.


I was replacing a broken battery box for my trailer brakes, and this box is identical to the OEM box that came with the trailer. The transaction with etrailer could not have been easier or faster. Product shipped immediately and was exactly as I expected. Excellent product, great price, excellent vendor.


This battery box ended up being an exact replacement for the one that I had that got damaged in an accident. I looked at several in a local store, and none of them were as rugged as this one. Attaches securely to my car trailer.

Its great, rugged and does the job well.
Scott - 12/03/2018


WIN WIN WIN WIN: The Product, Price, Delivery & Online Purchase experience were great. I'm mounting a small 12V battery in an antique Jeepster with a stock 6-Volt system, to operate 12 Volt novelty horns during parades. I sought a battery box similar to one built onto my flatbed trailer with elec. brake system. My search of your site, and purchase took only a few minutes, and delivery was surprisingly quick. Thank you!


Nice boxes. They do have plastic fins on the inside at all four corners that will not allow a 12 volt 7 amp hour battery to sit all the way down to the bottom of the case. A few minutes with a dremel tool to cut some of them off to allow my battery to fit low enough to close the lid. Well worth the price. The lid holds open by itself a nice design touch. Can be bolted closed or locked with a padlock.
Has four mounting holes. Case is motched for the wires to exit the side. Has drain holes/vent in the bottom


A very well made battery box.


Well made and functional box. We are using it for a solar powered business sign. A great find!

The box has worked just fine. Good product.
Don - 10/06/2017


used the box for a power wench on a boat trailer---had to modify inside to fit a larger battery but works for the job--use a solar array to charge the battery--mounted on top of the case.. no connection to vehicle alternator.


Item went on trailer perfect with no problem. Shipping was prompt and good price. Thank you

Great still on in good shape.Thanks
Armando C - 02/28/2019


Yes the boxes showed up and they are what we wanted. We use them with magnets
to put in remote spots for our wireless cameras
Was disappointed with UPS ,was delivered to post office in our area and we knew it wouldn't fit in our mail box on a rainy day (so) had to go and get them


Excellent product and perfect for what I needed. I used it for a battery holder for my Model T Ford......couldn't be more pleased.


Was looking for a replacement for a trailer battery box that got broken. Did not know brand, but knew dimensions. This is a perfect replacement for fit and function! Thanks!


Exactly as described in summary. Excellent price for a hard to find trailer battery box. Fast shipment. Thanks!


This battery box stands up to everything! Easy for me to install and get the battery settled it and hooked up...Didn't have to wait for my husband to "get around to it"

So far I really like it...It's just a battery box, but when hauling horses, it can literally be a life saver.

Show More Reviews

See what our Experts say about this Tekonsha Accessories and Parts

  • Is Lid Removable on Replacement Breakaway Battery Box Removable
    The lid on the Replacement Bolt-On Battery Box for Tekonsha Trailer Breakaway Kit # TK2051 is attached to the box by a piece of plastic. You could remove the lid if you wanted by cutting it off but it would be much easier to just use the whole box. I've added a link to a video review of this replacement breakaway box for you to check out.
    view full answer...
  • Battery Box to Carry CA1240 Battery on Boat Trailer
    The CA1240 battery you have on your trailer measures 3.5 inches long, 4 inches tall, and 2-3/4 inches wide which is a common size for a breakaway battery (most likely this is what the battery is for), so for a box to hold it the part # TK2051 would work well.
    view full answer...
  • What are the Dimensions of the Converter Box in Vehicle to Vehicle Tail Light Converter 118158
    We have a converter # 118158 laying around so I measured it. The box measures 2-15/16 inches by 2-7/16 inches by 1 inch. You could use a small battery box such as # TK2051 to better protect the converter from the elements. The converter will generate some heat so the box you put it in will need to be larger than the converter and it will have to have some ventilation. The battery box is the perfect combination of size and ventilation.
    view full answer...
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  • Battery Box for a 4-1/2 by 2-3/4 by 4-1/4 Inch Battery
    Yes, your battery will fit in Curt battery box # C52022. The box is 6" x 3-1/4" x 5-1/2" on the outside and the inside is only slightly smaller. Another option is # TK2051. On the inside it measures 5-15/16" long x 3-1/8" wide x 5-1/2" tall.
    view full answer...
  • Battery Recommendation for the Battery Box # TK2051
    The Replacement Battery Box part # TK2051 that you referenced has internal dimensions of 5-15/16" long x 3-1/8" wide x 5-1/2" tall and is designed for breakaway batteries like the # HM20008 that would easily fit in the box. This battery measures -1/2" L x 2-3/4" W x 4" H.
    view full answer...
  • Replacement Battery Box Recommendation to Replace one on 1994 Model 9419 Featherlite Horse Trailer
    The battery that fits in box # TN65117 measures 3.54 inches long, 2.76 inches wide, and 3.93 inches tall. Including the terminals it is 4.17 inches tall. This would be a bit too small for you based on the dimensions you listed. Instead take a look at the Tekonsha Battery Box part # TK2051. This box has inside dimensions: 5-15/16" long x 3-1/8" wide x 5-1/2" tall which would fit your battery well. The mounting holes would be different but you could still mount the box on your trailer.
    view full answer...
  • Battery Box for Breakaway Battery that Measures 7” L x 6.5” H x 3” W
    Your battery is quite a bit larger than most breakaway batteries so for a box you'd have to go a slightly different route with something like the part # DW03009 which has inner dimensions of 10-3/4 inches long, 7 inches wide, and 8-1/4 inches deep.
    view full answer...
  • Availability of Box for Battery that Powers Gate Opener
    We do have a battery box that will work for your needs, but it will be a bit larger than what you're needing. The NOCO Snap Top battery box, part # 329-HM082BKS has an inside dimension of 8 inches long, 7 inches tall and 5-3/16 inches wide which will accommodate your existing battery with a little room to spare. If there's a bracket or shelf available for mounting purposes, the box can attach from the bottom.
    view full answer...
  • Protecting a Trailer 7-Way Connector While Trailer is in Storage
    Covers for 7-Way trailer connectors are very uncommon and the only ones we have are attached to powered jacks. An inexpensive solution would be to use a small battery box such as # TK2051 and slightly modify it so you can put the 7-Way in it. I also recommend adding some dielectric grease, # LT37534, to repel moisture.
    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...
  • Where do Switches Mount on Ultra-Fab Power Twin II Electric Stabilizer Jack
    There is no specific secure box made to mount the Replacement Switches for Ultra-Fab Power Twin II Electric Stabilizer # 39-841643 for the Ultra-Fab Power Twin II Electric Stabilizer # UF39-941705. Any protected environment you have available would be optimal, and as you can see from the accompanying photos from our customers who have mounted these switches, there are varying locations. One solution would be to use something like battery box # TK2051 and drill into it for the wiring.
    view full answer...
    Image 1 for Image 2 for
  • Universal Replacement Breakaway Battery Box for Trailer
    I do have an option for you but the replacement breakaway battery boxes that you were looking at like the Replacement Battery Box for Titan Gel Cell Breakaway Kit part # TN65117 are designed for specific breakaway batteries. Therefore, a better option for you would be to purchase a matching breakaway battery and box, like part # TK2023 and part # TK2051. The Curt Battery Box for Breakaway Kits part # C52090 may work for you as it measures 5-7/8" long x 3-1/2" wide x 5-3/8" tall but again...
    view full answer...
  • Can a Breakaway Battery Be Used to Power an Interior Light
    Yes, you can use a breakaway battery to power the interior light on your enclosed trailer. However, these batteries typically only have a 5 amp hour rating so that is something to make note of. If you were to use an LED interior light like the Optronics LED RV Interior Light with Switch part # RVILL34 then you would not have any issues as it only draws .6 amps of power. With that being said, you will not need the Tekonsha Push-To-Test Trailer Breakaway Kit with Built-In Battery Charger...
    view full answer...
  • Needing a 2-3 Wire System that will Seperate the Turn Signals from Stop Signal
    I do have a part that will work for what you are needing, but the Hopkins Tail Light Converter Kit, part # HM48895, will not take a 2 wire signals and split it into a 3 wire signal. To split your 2 signals into 3 you will want to use the Tow Ready Vehicle to Vehicle Tail Light Converter, part # 118158. This will take your combined turn and stop wires and separate them into right turn, stop, and left turn wires. Please note that this converter does not work well with LED lights. Another...
    view full answer...

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