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Snap-Top Battery Box with Strap for Group 27 Batteries - Vented

Snap-Top Battery Box with Strap for Group 27 Batteries - Vented

Item # 329-HM327BKS
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Snap-Top Battery Box with Strap for Group 27 Batteries - Vented 16-15/16L x 9-13/16W x 11-1/2D Inch 329-HM327BKS
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Battery box protects your automotive, marine, or RV battery against impacts, contaminants, and leaked battery acid. Ventilated lid features cable ports and locking tabs. Reinforced handles for safe grip. Molded plastic is impact and UV resistant. 1-833-496-1390 to order NOCO battery boxes part number 329-HM327BKS or order online at Free expert support on all NOCO products. Guaranteed Lowest Price and Fastest Shipping for Snap-Top Battery Box with Strap for Group 27 Batteries - Vented. Battery Boxes reviews from real customers.
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  • Reviews (43)
  • Q & A (0)
  • Videos (3)
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NOCO Battery Boxes - 329-HM327BKS

  • Marine Battery Box
  • Camper Battery Box
  • Trailer Battery Box
  • Equipment Battery Box
  • Group 27 Batteries
  • 16-15/16L x 9-13/16W x 11-1/2D Inch
  • NOCO
  • Black Plastic

Battery box protects your automotive, marine, or RV battery against impacts, contaminants, and leaked battery acid. Ventilated lid features cable ports and locking tabs. Reinforced handles for safe grip. Molded plastic is impact and UV resistant.


  • Battery box protects your automotive, marine, or RV battery against impacts, contaminants, and leaked battery acid
    • Great for installation on a boat, camper, motorhome, trailer, or generator
  • Rugged, molded plastic is resistant to impact, UV rays, oil, gas, and battery acid
    • Maintains impact resistance in extreme conditions down to -20 F
  • Ventilated lid secures to container with 2 fasteners and a 42" box strap
    • Multiple exit points allow dangerous acid vapors to be released safely
  • 4 Cable ports provide multiple battery wiring options
  • Acid-resistant reservoir safely captures spilled battery acid inside the box
  • Reinforced handles ensure secure grip while carrying the battery
  • Meets Federal USCG 183.420 and ABYC E-10.7 requirements for marine use
  • Made in the USA


  • Application: 12-volt lead-acid batteries
  • Battery size: group 27
  • Battery box dimensions:
    • External dimensions: 16-15/16" long x 11-1/2" tall x 9-13/16" wide
    • Internal dimensions: 13-3/16" long x 10-1/8" tall x 7-3/16" wide
  • Compatible battery size:
    • Maximum: 13-3/16" long x 10-1/8" tall x 7-3/16" wide
    • Minimum: 11-3/16" long x 8-1/8" tall x 5-3/16" wide
  • Box strap length: 42"
  • Temperature range: -20 F - 320 F
  • Weight: 4 lbs
  • 1-Year limited warranty

NOCO battery Box for Group 72 Batteries HM327 dimensional diagram

HM327BK NOCO Snap-Top Battery Box for Group 27 Batteries

Replaces Powerhouse PH13035

California residents: click here

Video of Snap-Top Battery Box with Strap for Group 27 Batteries - Vented

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

Video Transcript for NOCO Group 24 to Group 31 Battery Box with Strap Review

Speaker 1: Today we're going to be taking a look at that NOCO Battery Box, with strap, for group 24 to 31 batteries, part number 329-HM318BKS. What's unique about this battery box, it's going to accommodate different size batteries. It will accommodate group 24 to group 31 size batteries. Now, NOCO also makes similar boxes that will accommodate single size batteries like your group 24 batteries, your group 27 batteries, your six volt batteries, and your U1 batteries. This one will actually fit multiple size batteries, and has a separator for the size battery you're installing. You simply slide it in and you see it's going to have six slots to slide your separator in, depending on the battery size that you have.

This is going to help keep your battery from sliding side to side.On the inside here, you can see how we have a raised section. Your battery is going to sit on top of this raised section, what these spots are that are dropped, these are reservoir, acid reservoirs. They are acid resistant, so the acid will not eat through the plastic if your battery happens to have a leak in it or something, the acid is going to come down and sit in these reservoirs instead of sitting on the bottom of the battery. The box itself is constructed of a UV resistant molded plastic, you can see it's going to have nice handles. If you decide to mount this inside, where you can carry the battery around inside the box, the handles very durable, strong, very wide grip, so you can get your whole hand in there.

As far as the lid, this is a snap lid, so it will lock into place, and it's also vented to release any fumes that may be caught inside the box.Another nice thing about this lid, or this box, is you're going to have four locations for any wiring that you may have hooked up to the battery. We're going to slide our battery in, we're going to slide it all the way over to the edge. Then we're going to take our adapter plate here, and we're going to slide it in just like that, right next to the battery. We can either run our cables in one of the four locations before we put our lid on, or if we're just wanting to store our battery, throw our lid on. Your box is also going to come with a nylon strap.

If you use it with the hardware that it comes with, on a wood floor of a boat or trailer, the strap itself will actually be used to hold the battery box, battery down to the floor. If you're using it in our situation here, where it's mounted to a metal frame, the strap is just going to be used to hold down the lid.The buckles on the strap are going to be a durable plastic. You can see they're going to have teeth, bottom and top one are going to have teeth on them to help them grip on to the strap when you have it on the box. We'll go over top and then down through the bottom. And then we'll pull it tight and that will secure your lid on.

Now that we've gone over some of the features of this NOCO Battery Box, let me show you how I installed it.For our installation, you're going to have two clips like this that come in your kit. Now, you're also going to have four wood screws. In our case, our customer wants the box mounted on the front of his trailer, to a metal frame. In order to get it into our metal frame, we're going to use some self-tapping screws and some fender washers. The reason we're using fender washers is because our box is a plastic and we don't want to pull that head through the plastic. This will give it a little wider base for a little bit stronger hold. We'll take our self-tapping screw and our fender washer, you want to make sure you're going into this small acid reservoir, in each corner, and not here in this raised part because your battery is going to sit up on here. You don't want the head of the bolt potentially causing damage to the bottom of your battery.We'll go ahead and do the same thing, put one in each corner here like that to hold our box in place. We'll have our strap, we can drop down. And that will keep it, our lids secured. That will do it for a look at the NOCO Battery Box with strap, group 24 to group 31 batteries, part number 329-HM318BKS.

Customer Reviews

Snap-Top Battery Box with Strap for Group 27 Batteries - Vented - 329-HM327BKS

Average Customer Rating:  4.7 out of 5 stars   (43 Customer Reviews)

Battery box protects your automotive, marine, or RV battery against impacts, contaminants, and leaked battery acid. Ventilated lid features cable ports and locking tabs. Reinforced handles for safe grip. Molded plastic is impact and UV resistant.


I needed a new battery box to fit a marine battery that came with the tent trailer I purchased. It worked perfectly for what I needed.


The battery boxes arrived on time and properly packaged. Wont unbox until the weekend but the box is undamaged and we dont anticipate any problem..


I haven't used it. I bought a lifepo battery which needs more ventilation.


Great product


I needed a battery box that could accommodate a lithium battery for my camper and this one is the perfect size. It’s sturdy and is doing a good job.


Ample size, and should work for almost any 12v battery you use. I have not mounted the box yet, so I cannot comment as to the functionality. I have chosen to mount the box inside the trailer after deciding the openings and material of the box probably won't survive exposure to sun and moisture well enough to keep the terminals and wires from corroding.


Worked as expected. Securing it with just the strap seems a little inadequate (at least for my set-up) but that can be fixed with a little ingenuity. The supplied plastic brackets (the brackets are for the strap, not the box) with small self tapping screws are also only adequate if you are going into sheet metal. Anything thicker than that and you need something more "robust".


The battery boxes are great, as always. You guy's rock!


Great product and great service from! the best!


All as described. Will order from etrailer again.


Box fits the UB12100 battery perfectly! Fast shipping as always! Thanks etrailer!!


Functional. No sign of deterioration. That's what one wants - just gets the job done.


Everything I order from etrailer is perfect for what I need. It shows up almost as soon as I click the buy button! I have come to depend on etrailer for my camping and trailering needs. I will be dealing with them in the future. There just isn't enough good things to say about them.


I actually did not use it on a trailer. I used it on my pontoon boat when i upgraded the battery to a bigger size. It worked perfectly and is well made.


Superior customer service. I ordered some materials that I
didn't need and received a return shipping label immediately
so that I could receive credit for my returns.
7 foot bunk boards were of excellent quality as was the battery
storage case for my series 27 trolling motor.


Ordering was easy, package came quickly, battery box is well made and came with the tie down strap. Perfect replacement for the old, damaged battery box.


We use these boxes on our camper builds and we've been happy with them. They are super affordable and we've had great luck with lids staying on without strapping them. Not recommending this, just worth noting... they clip in and are pretty secure.


A year later and the box is still dry protecting the battery. My old one leaked and I could never figure how water got inside of the box


Worked for what I needed it for... wish it was thicker and a little more flexible but it did as advertised


Extremely happy with the product's and the service delivery.


etrailer is awesome - high quality products, easy transactions, and great customer service - Shipping was perfect as well!!


It's a simple product, but it's very good quality and perfectly suited for the function. Good job as always, etrailer.


Excellent product quality. Exactly what I needed as I replaced batteries in our 5th wheel.


It's a battery box! price weas right and fits together fine.


Seems like a great box. Fit my large group 31 battery perfect.

Show More Reviews

See what our Experts say about this NOCO Battery Boxes

  • Battery Box that Can Fit Battery that is 12 inch, by 6.5 inch, by 8 inch
    For the dimensions you listed the Snap-Top Battery Box with Strap for Group 27 Batteries # 329-HM327BKS would be a really great option as it has internal dimensions of 13-3/16" long x 10-1/8" tall x 7-3/16" wide.
    view full answer...
  • Battery Box for Group 27 Battery on Trailer
    I am not exactly sure where you would like to install the battery box but the only battery box we have designed specifically for a group 27 batteries is the NOCO Battery Box part # 329-HM327BKS. This battery box is vented for safety, has an easy to use snap top, and comes with pre-drilled cable ports. It can be mounted in pretty much any fashion you like and comes with self-tapping screws for a level surface. You may also be interested in the NOCO Accessories X-Connect 12V Battery Indicator...
    view full answer...
    Image 1 for
  • Installing Trailer Mounted Battery to Power Trailer Tongue Jack
    Due to the importance of a properly functioning break away system, it would be best to leave the existing break away battery in place and add an additional battery for powering the jack. A standard automotive or small deep-cycle 12 volt battery would work just fine for you. I would recommend using a battery box like # 329-HM327BKS to protect the battery from the elements. The 12-volt accessory circuit from the 7-way would run to the positive terminal of your auxiliary battery, and then...
    view full answer...
    Image 1 for
  • Electric A-Frame Trailer Jack and Battery Box Recommendation for an Enclosed Trailer
    You can get a jack and battery box from us, right here at etrailer! For a battery a 12 volt car battery will work fine. It doesn't have to be the fanciest battery (since they are getting so pricey these days) so long as it has the amperage rating for the draw of the jack you use. For a battery box you could use # 329-HM327BKS for group 27 batteries. The interior measures 13-3/16" long x 7-3/16" wide x 10-1/8" deep so the battery will need to fit those dimensions. It comes with mounting...
    view full answer...

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Info for this part was:

Employee Joshua S
Video Edited:
Joshua S
Employee Cole B
Installed by:
Cole B
Employee Shane H
Installed by:
Shane H
Employee Daron K
Edited by:
Daron K
Employee Brian T
Written by:
Brian T
Employee Michael B
Video by:
Michael B

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