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Battery Box Vented - U1

Battery Box Vented - U1

Item # DW03188
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Deka 10-1/2L x 7-3/8W x 9-1/4D Inch Battery Boxes - DW03188
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  • Reviews (44)
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  • Videos (3)
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Deka Battery Boxes - DW03188

  • Marine Battery Box
  • Group U1 Batteries
  • 10-1/2L x 7-3/8W x 9-1/4D Inch
  • Deka
  • Black Plastic

  • U1 vented polypropylene battery box
  • Protects battery in marine and commercial applications
  • Dimensions: 10-1/2" L x 7-3/8" W x 9-1/4" H
  • Inside dimensions with lid removed: 8-1/4" L x 5-1/4" W x 6-1/8" D
  • Vented for safety
  • Includes all installation hardware

03188 Deka Battery Box

03188 Battery Box Vented - U1

California residents: click here

Video of Battery Box Vented - U1

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

Video Transcript for Deka Battery Boxes - Marine Battery Box - DW03188 Review

Today we'll be reviewing part number DW03188. This is the Deka Battery Box with a nice vented lid. So it's going to be vented for safety, allowing potentially explosive gases to escape. This is a U1 vented polypropylene battery box with a polypropylene material. It's going to stand up well against corrosion and impact. It's going to protect your battery in marine and commercial applications. It also includes all the installation hardware, so you're going to get a nice heavy-duty strap to secure the lid to the box, and the box to your surface.

You're going to get the mounting brackets, as well as all the screws that you need for installation. The dimensions of the box with the lid installed is going to measure 10-1/2" long by 7-3/8" in width, and 9-1/4" in height. If we we're to remove the lid, the inside dimensions is going to measure 8-1/4" in length by 5-1/4" in width, and 6-1/8" in depth or in height. It's also got the nice little handles on the side. That way you can easily transport the battery box if you ever need to change locations. That's going to do it for our review of part number DW03188. This is the Deka U1 Vented Battery Box. .

Customer Reviews

Battery Box Vented - U1 - DW03188

Average Customer Rating:  4.8 out of 5 stars   (44 Customer Reviews)


Perfect battery box for my small battery I run my outboard motor with.

Nicholas - 04/24/2022


This was probably made for a lawn tractor battery, but was perfect to house my small solar system with two 5.5 amp closed cel batteries and the charge controller that came with my solar panel. It just fits in the space between my camper on my Tacoma.


It is a plastic battery box. Its purpose is to protect the battery and contain acid in the unlikely event of a leak. It is the same materials and quality as can be bought locally, but a smaller size than can be found in stores. The quality is very good. I am using it for a U1 size deep cycle battery to run a fish finder. The hold down brackets are plastic. It would be much better if they were aluminum or stainless steel. I would pay extra to have stronger hold down brackets. The plastic ones might break in the event of a quick stop with a trailered boat. It would also be better if there were slots or brackets molded on the box for the strap to pass through.

Works as advertised, no problems. Contains and restrains the battery.,
John F - 05/03/2014

by: 10/26/2021

Out standing service I always get what I order and in and very timely matter


Excellent customer service.


Etrailer was the only place I could find a box that fit the garden tractor battery. I installed a second battery on my Kawasaki Mule. I secured the box to a flat surface with four self tapping screws and fender washers. The box is well built. I also like the cover. It keeps the battery clean and protects terminal connections.


Excellent for what I needed it for. I used a pool noodle to secure a small battery inside this box so that the battery would not rattle inside. I carefully cut the noodle to sizes I needed and the battery is snug. Drilled a hole in the top for an accessory connector, so as to have less wires hanging around and easy removal from my SeaDoo. The hardest part was to find a place in the front storage compartment where I can fasten the box down. Will test this later.
I have this box to house a battery for a depth/fish finder for my 2004 SeaDoo GTX for fishing.

Yes, I fish from a PWC - it is fun. :)
Fish. Ski. Why not both?!


Great way to keep your battery out of the elements, and secure to your trailer.


The battery box is exactly what I needed for a lawn vacuum, the product is well made, protects the battery from being damaged and keeps the battery clean.


I like it, Thank you very much !!


The shipping was fast and arrived as scheduled.
purchased the battery box to hold a battery in my cargo trailer to power led light strips.


I use the battery box for a permanent backup generator, mounted nicely to pad for easy cable hook up. Water tight and does a nice job.


A very good quality case for the money spent. Etrailer provided very fast shipping and communication. The item was packaged well.


Purchased two U1 vented Battery Boxes and they are perfect for my application. Couldn’t be more pleased. I use these to house batteries for my automatic gate opener batteries.


Fits battery perfect


Works great. No issues with several trips to nearby lakes with our electric trolling motor. The small size is really nice as space is an issue on my 13 foot boat.


Quality product at a good price. Needed a small battery case for my camper and this one was a perfect size.


The box was exactly what I wanted. It arrived quickly and etrailer had the best price. Very happy!


good price, product, and fast service


Battery case exactly what I needed for my Project. It will be installed in my 1915 model T ford to hold the battery which runs the ignition system. Not used to often so can use my garden tractor battery when needed.


This is a sweet little box especially for the price!


Nice box, but the holes in the top (vents) allow rainwater to get inside.


great product great quality, cheaper then anyone else i could find....


Perfect size for U1 battery. Shipped quickly. Great price.


Used it for a gate opener so its outside 100% of the time. No fading or anything.

Show More Reviews

Ask the Experts about this Deka Battery Boxes

  • What is the Height of the Battery Box Vented, part # DW03188
    The height dimension of this Battery Box, part # DW03188, is 9-1/4 inches. The length is 10-1/2 inches and the width is 7-3/8 inches.
    view full answer...
  • Battery Box that Accommodates 6.25L X 4.125W x 4H Battery
    We do have several battery boxes, but none with the exact dimensions you have listed. The closest battery box to your stated dimensions we offer would be part # DW03188. The inside dimensions of the box with the lid removed are 8-1/4 inches long, by 5-1/4 inches wide at the bottom of the inside of the box, and 6-1/8 inches deep. The overall outer dimensions of the battery box are 10-1/2 inches long, by 7-3/8 inches wide, by 9-1/4 inches high, with the lid on the box. I have included...
    view full answer...
  • Recommended Battery Box With Inside Dimensions To House 5.9 x 2.6 x 3.7 Inch Battery
    My recommendation is to use the Deka Battery Box Vented- U1, # DW03188. It has inside dimensions with lid removed: 8-1/4" L x 5-1/4" W x 6-1/8" D. All of our battery boxes are slightly smaller or way larger than your battery dimensions, so this one will allow some room, but still be functional for you.
    view full answer...
  • Does Battery For Popup Camper Need To Be Grounded To Trailer
    If you are using a 12V battery on your popup camper you will need to ground the battery to the trailer frame. Since you said you are charging the battery with a solar panel you will not need to attach the battery to the trailer connector. I also recommend installing a battery box like part # DW03188. This battery box comes with the mounting hardware and a strap to secure the battery box to the trailer frame.
    view full answer...
  • Mounting Deka Vented Battery Box on Trailer
    The Deka Battery Box # DW03188, which is for Group U1 batteries, is designed to be mounted with a surface under it, as the mounting hardware is used to put a strap through it and hold the box that way. You would need to fabricate your own surface in the space you showed in your photo and mount it to that surface with the provided hardware. I've attached a link to an installation video for you to check out that shows how this box was designed to be mounted.
    view full answer...
    Image 1 for
  • What Type of Battery Was Battery Box Vented # DW03188 Intended For
    The Battery Box Vented # DW03188 that you referenced was designed to fit U1 style batteries which are the size seen often in lawn mowers. As long as the dimensions match what you'd need though this would work well. The dimensions are: 10-1/2" L x 7-3/8" W x 9-1/4" H externally 8-1/4" L x 5-1/4" W x 6-1/8" D internally I attached a review video for this box for you to check out as well.
    view full answer...
  • Outer and Inner Dimensions of the Vented Battery Box # DW03188
    I went out to the warehouse and pulled the Vented Battery Box, # DW03188, and produced a short video showing the dimensions of the box for you, see link. The inside dimensions of the box with the lid removed are 8-1/4 inches long, by 5-1/4 inches wide at the bottom of the inside of the box, and 6-1/8 inches deep. The overall outer dimensions of the battery box are 10-1/2 inches long, by 7-3/8 inches wide, by 9-1/4 inches high, with the lid on the box. You may also be interested in the...
    view full answer...
  • Battery Box Recommendation for Battery that Measures 8-1/4" L x 5-1/4" W x 6-1/8" D
    The battery box we offer that would work the best for you would be the part # DW03188. The inside dimensions of this box are 8-1/4" L x 5-1/4" W x 6-1/8" D. You battery may seem to tall, but that dimension is without the lid with will add some inside height.
    view full answer...
  • Do You Carry a Battery Box With a Metal Frame for a Battery That Measures 6L x 4W x 4D
    We do not have a battery box with a metal frame to fit batteries of those dimensions. The only thing we have close is the Battery Box Vented - U1 # DW03188, but it is a plastic box.
    view full answer...
  • What Size Battery Fits in the Replacement Battery Box for Breakaway Kit, # 34420215
    The Replacement Battery Box for Breakaway Kit, # 34420215, will accept a battery that is 3-1/2 inches x 2-3/4 inches and 4 inches tall. You might also want to look at: Battery Box Vented - U1, # DW03188: 10-1/2 inches x 7-3/8 inches x 9-1/4 inches Battery Box Vented - Marine 24, # DW03009: 11 inches x 6-3/4 inches x 8 inches
    view full answer...
  • Can I Power Lights On My Horse Trailer With a Small Battery Installed on Trailer
    Yes, you would be able to install a battery on your horse trailer, and power the lights when the trailer is not connected to the truck. What you will want to do is run the power wire, typically the Black wire, on the trailer connector and connect it to the positive battery terminal. You will want to ground the battery to the trailer frame, and then run the power wires for the lights to the positive battery terminal. Each light assembly should be grounded to a clean metal surface. You...
    view full answer...
  • Providing Power To Dome Lights In Car Hauler When Unhooked From Tow Vehicle.
    You would need a 12V power source on or inside the trailer that would provide the power needed to power the dome lights in your trailer. You can then install the battery in-line into the power wire coming from the 7-way connector. This would then charge the battery on the trailer when hooked to your truck, and give you the power needed when you want to unhook your truck, and use your car hauler like a work shop. If you plan on leaving the car hauler off of your truck for extended periods...
    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...
  • 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
  • How to Power Superwinch LT2000 ATV Winch
    No matter where you mount the Superwinch LT2000 ATV Winch # 1220210 it does need to be powered via a 12 volt battery with a circuit breaker between the switch and battery, as per the the cutout of the instructions I've added for you. You can use an auxiliary 12 volt battery and store it in a battery box such as # DW03188 or # TWSP12B and then have the circuit breaker temporarily mounted to the truck bed to do this.
    view full answer...
    Image 1 for
  • Battery Box Recommendation for a 6-5/16" Tall, 5-5/16" Long, 3-3/16 Inch Wide Battery
    We have numerous battery boxes, see link below, some are smaller than the battery size you have and some are larger. The box you end up with will most likely have at least one physical dimension that is much larger than the same dimension on the battery. For example the Tow-Rax battery box # TWSP12BP is 12 inches long, 8-5/8 inches wide, and 10-7/16 inches tall. Plenty of space for the battery and any wiring going to/from it. A plastic box such as # DW03188 is a good option as well. It...
    view full answer...
  • Battery Box Recommendation for GC2 Group Size 6 Volt Battery
    For your GC2 Deep Cycle Extreme GC2-ECL-UTL battery, I recommend the Snap-Top Battery Box with Strap for 6V Batteries - Vented, part # 329-HM306BKS. It is compatible with battery sizes ranging from 8-5/8" long x 9-5/8" tall x 5-5/8" wide up to 10-5/8" long x 11-3/16" tall x 7-5/8" wide, so it will work perfectly with your G62 6V battery that is 10-5/16" long x 11" tall x 7-1/8" wide.
    view full answer...
    Image 1 for
  • 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...
  • Recommendation For Powering Interior Lights When Parked For Long Periods Of Time
    I do have a way to get your lights working when not plugged into the vehicle, but there isn't a way to convert a 4 Flat into working with a 110v wall socket, unfortunately. With that being said, what you will need to do is start with adding a battery using something like the Deka Battery Box # DW03188. This does not include the actual battery, but it will give you somewhere to mount it. Odds are this will be able to keep your lights working over night, especially if they are LED, but in...
    view full answer...
  • Is it Possible to Hook Seven-Way Directly to a Battery to Power Concession Trailer Lights?
    It is possible to use a 7-way vehicle end connector such as # PK12-707E to hook up to a stand-alone battery for your lights. You would need to connect by using 10 gauge wire, # 10-2-1, and if you use a deep cell battery as you suggested, a pair of ring terminals such as # DW05705-1 would secure your wiring to the battery. For a more permanent setup, you can mount a battery box such as # DW03188 (the exact size would depend on the dimension of the battery) on the trailer so you do not have...
    view full answer...
  • Recommendations To power Lights In Trailer When Not Hooked To Towing Vehicle
    You would need a power inverter to allow you to power the 12V LED lights in your trailer with a 115V power source. That could prove to be expensive. I do have another solution that will work for you. To be able to plug into AC power the trailer would need to be set up with a transfer switch and electrical panel similar to what is on a house. This is a major conversion for a trailer that is not already set up for it. I recommend you use a junction box along with the additional battery to...
    view full answer...
  • What is Needed to Install Interior LED Lights in an Enclosed Trailer
    Installing the Optronics LED RV Interior Light, # RVILL34, should be a fairly easy project. The two wires on the light are 12 gauge. The white wires can be grounded to the trailer body, the black wires are your power wires. Using # 12-1-1 you can connect to the black wires and run this wiring to where you are going to install your battery. Using a 12 gauge wire nut, found at any hardware store, connect all the light wires and the power wire from the battery together or you could use...
    view full answer...
  • Recommendation for Power When Not Hooked Up to Vehicle
    I can help you with lighting up your enclosed trailer. First you would want to get an auxiliary battery. Next we would want to run all the interior lights power wires to a switch, like the Pollack # PK34513, using a 10 or 12 gauge wire, like Deka's # 10-1-1, ending the wire at the battery's positive terminal. To connect them to the power wire you will need to use quick splices # 562 and butt connectors # 05732-2 and a ring terminals # DW05741-1 on the end, we have all these on our site...
    view full answer...
    Image 1 for
  • Recommended LED Light Bar for an Enclosed Snowmobile Trailer
    I can help you with lighting up your enclosed snowmobile trailer. I would recommend the Optronics Opti-Brite # ILL08COB. This light produces 1400 Lumens so it would be very bright. The dimensions of the lens of this light are 4 by 16-1/2 inches. If you wanted more of a bar light I would recommend the Optronics Thinline Opti-Brite LED # ILL72CB, this light has 27 diodes and puts out 513 effective lumens. This light measures 21-7/8 inches long by 1 inch wide by 5/8 inches thick. Watts...
    view full answer...
    Image 1 for

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