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Snap-Top Battery Box with Strap for Group 24 Batteries - Vented

Snap-Top Battery Box with Strap for Group 24 Batteries - Vented

Item # 329-HM300BKS
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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. Call 800-298-8924 to order NOCO battery boxes part number 329-HM300BKS or order online at etrailer.com. Free expert support on all NOCO products. Guaranteed Lowest Price and Fastest Shipping for Snap-Top Battery Box with Strap for Group 24 Batteries - Vented. Battery Boxes reviews from real customers.
  • All Info
  • Reviews (7)
  • Q & A (6)
  • Videos (3)
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NOCO Battery Boxes - 329-HM300BKS

  • Marine Battery Box
  • Camper Battery Box
  • Trailer Battery Box
  • Equipment Battery Box
  • Group 24 Batteries
  • NOCO
  • Black Plastic
  • 14L x 10W x 10-11/16D Inch

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 automotive, marine, and RV lead-acid SLA batteries
  • Battery size: group 24
  • Battery box dimensions:
    • External dimensions: 14" long x 10-11/16" tall x 10" wide
    • Internal dimensions: 10-1/2" long x 9-5/8" tall x 7-3/16" wide
  • Compatible battery size:
    • Maximum: 10-1/2" long x 9-5/8" tall x 7-3/16" wide
    • Minimum: 8-1/2" long x 7-5/8" tall x 5-3/16" wide
  • Box strap length: 42"
  • Temperature range: -20 F - 320 F
  • Weight: 4 lbs
  • 1-Year limited warranty

NOCO HM300 Group 24 Snap Top Battery Box Dimensions

HM300BK NOCO Snap-Top Battery Box for Group 24 Batteries

Replaces Powerhouse PH13034

California residents: click here

Video of Snap-Top Battery Box with Strap for Group 24 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 24 Batteries - Vented - 329-HM300BKS

Average Customer Rating:  5.0 out of 5 stars   (7 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.

- 329-HM300BKS

Does its job and is sturdy. Its holding up well. 734580

- 329-HM300BKS

Excellent replacement for broken battery box! 724828

- 329-HM300BKS

Good product, good price, just what we needed. Thank you! 675241

- 329-HM300BKS

Added the battery box to my Parkit 360 Trailer Mover. Great product for the money 633289

- 329-HM300BKS

Good quality for the price 625285

- 329-HM300BKS

Plastic Battery Box...... nuff Said 482346

- 329-HM300BKS

It's a great battery box for the price. 482123


Ask the Experts about this NOCO Battery Boxes

  • Battery Box To Mount On Flatbed Trailer
    We have battery cases that are used for either a breakaway battery that is too small for the dimensions of the battery you said you have, or battery boxes for larger batteries that may be too bit. One of the cases that you may want to check out is the NOCO, part # 329-HM300BKS. The inside dimensions for this box is 10-1/2 inches long x 7-3/16 inches wide x 9-5/8 inches deep.
    view full answer...
  • Installing NOCO Battery Box
    The two mounting brackets included with the # 329-HM300BKS battery box would fasten to the mounting surface, using the included screws (or suitable hardware of your choosing) and the straps would be threaded through. The battery box would be placed on top of the straps, which would then be looped around the top of the box then buckled into place. Pretty easy, but I can understand why it wasn't obvious from the description photos.
    view full answer...
  • How to Charge a Trailer Battery for Use with a Bulldog Jack
    What you described is actually the best solution! Connecting your battery to 12V Power wire from the 7-Way on your trailer is a great way to provide a maintenance charge on your battery to operate a Bulldog jack like part # BD500199. Mounting a battery inside a box like part # 329-HM300BKS inside your trailer will further help to keep your battery safe from the elements (although battery boxes do a pretty good job at that). Please note that the 12V power from your vehicle will not...
    view full answer...
  • How to Mount 2 Batteries on A-Frame Trailer with Limited Space on Tongue
    I do have a possible solution for you but unfortunately there aren't any battery boxes available that will hold two 12V batteries and fit within a 21" length and 8" width. The closest thing we have is the TorkLift PowerArmor Locking Battery Box # TLA7708R which measures 26-3/4" long x 8-3/16" wide x 13" tall and as you can see from customer pictures the batteries fit in there pretty snug. Your batteries actually don't have to be side by side so you could potentially put one inside your...
    view full answer...
  • Battery Box or Tray for a 7-1/2 x 5 x 7-1/4 Inch Battery
    NOCO Battery Box # 329-HM300BKS is a good option. The interior dimensions are 10-1/2" long x 7-3/16" wide x 9-5/8" deep. It doesn't have a metal bracket for mounting though. The boxes that have metal brackets are either too small for your battery size or they are custom made to fit specific vehicle frames. I would go with a box over a tray because a box will better protect the battery.
    view full answer...
  • Adding a 7-Way, Battery, and Interior LED Lights for an Enclosed Trailer
    It would be a good idea to add a 7-Way trailer connector such as # 54-67-525 to the trailer so you can utilize the 12 volt circuit on the Toyota Tundra's 7-Way connector to provide a maintenance charge to a trailer mounted battery. On the above 7-Way the green wire is running lights, brown is right turn and brake lights, black is 12 volt that you will run to the battery on the trailer, red is left turn/brake lights, and white is ground. Usually on a 4-Way you will have white as ground,...
    view full answer...

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Info for this part was:

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

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