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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
Our Price: $30.42
Battery Boxes
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Shipping Weight: 2 lbs
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NOCO Battery Boxes - 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. 1-800-496-5010 to order NOCO battery boxes part number 329-HM300BKS or order online at Free expert support on all NOCO products. Great prices and Fastest Shipping for Snap-Top Battery Box with Strap for Group 24 Batteries - Vented. Battery Boxes reviews from real customers.
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  • Reviews (41)
  • Q & A (0)
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  • Why etrailer?

NOCO Battery Boxes - 329-HM300BKS

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

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

Customer Satisfaction Score:

Customer Reviews

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

Average Customer Rating:  4.7 out of 5 stars   (41 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.


Worked as advertised. Fast shipping is always a plus.


All the products are what I expected, they just didn’t get here in a timely fashion. This is not necessarily your fault as I know supply chains are bad for you right now. Your service over the years has been 5 all the way, but this time because of the 4 week delay I gotta give you a 4. Don’t lose any sleep over it.


Works perfect!


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


Looks great.Just what I needed


Exactly what I needed.


Roger has been the most helpful in ensuring I always get the right parts and extremely knowledgeable of etrailers inventory. He is pleasant and professional in every aspect of his interpersonal relations and real asset to your organization.


Perfect size and quick delivery.


Bought to replace old battery box cover that fell off while towing camper. Fit perfectly on top of old battery box. Just make sure it snaps in place before towing! Also comes with strap for additional security.


This is the one you want. I lost the top of my original battery box when the strap loosened up while towing. This box has the lid snap securely in place so it won't fly away if the strap gets loose without you knowing. Best price I could find was at etrailer and the shipping was reasonable and quick.


Box worked out fine. Did drill a couple of holes in the bottom to secure it firmly to my trailer, was concerned the strap wouldn't hold it securely enough on an open rail.


Plastic battery box was squeeze in cardboard box, deformed, but luckily not cracked. Hopefully it will stretch back out so the cover fits properly.


Exactly what I was expecting. My previous battery box was for a larger battery, making connecting to the battery and getting the wires out of the openings a hassle because openings in the top didn't line up at all with the terminals. I use this for my small 14 ft Deep v fishing boat.


Great battery box! Exactly what I neede d.


So far its holding up well on my log sp litter


I have ordered several items from e trailer,services have always been great, shipping is always fast and on time. I have e trailers in my favorite list.


Works great, battery fits without rattl ing.


Plastic Battery Box...... nuff Said


Great box will work find with my solar panel.


Excellent replacement for broken battery box!


It's a great battery box for the price.


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


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


Good quality for the price


Show More Reviews

See what our Experts say 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...
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  • 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 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...
  • Troubleshooting Interior Lights Not Working On an Enclosed Trailer
    It sounds like your interior lights on your 2019 Legend are powered off a secondary battery. The exterior clearance/ marker and tail lights are powered directly from your 2020 GMC Sierra 1500. The small battery on the front is generally only used for electric trailer breakaway brakes. If being used with additional lighting the battery is replaced with a larger unit. You will want to check for any additional terminals which you may need to trace from the light switch itself. If you have...
    view full answer...
  • How to Prevent Trailer Battery from Draining Tow Vehicle Battery
    To prevent your truck battery from draining from an auxiliary trailer battery like you plan to install when the vehicle is off you'd need to install an isolation solenoid on the 12 volt accessory circuit like with the part # TR118665. This will open the circuit when the vehicle is off so that the battery couldn't drain the main truck battery. Another option would be to always disconnect the trailer wiring when parked. A deep cycle battery like the part # BRW34FR would work great for your...
    view full answer...
  • Could Trailer Breakaway Battery Power RV Powered Jack
    If the jack drew less than 10 amps the Bright Way Push-to-Test Trailer Breakaway Kit with 2-Amp Charger and 10 Ah Battery # 3802311 would work decently but typically they draw more than that. A better option would be a deep cycle battery like the part # BRW34FR which is rated for 75 amps. Then for a battery box the # 329-HM300BKS would work great.
    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...
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  • I Need a Battery To Operate The Jacks On My Slide In Truck Camper
    I recommend a Bright Way Deep Cycle RV Battery # BRW34FR. This AGM battery is sealed and does not require the maintenance of a traditional lead acid battery. When not in use it is important to provide a battery charge maintainer to ensure the battery voltage does not drop to low. A Bright Way Solar Battery Charger # BRW54FR will provide up to 7.5 watts of charge from the sun. A Snap-Top Battery Box with Strap # 329-HM300BKS will protect the battery from the elements as well as provide...
    view full answer...
  • Recommended Weight Distribution For a Forest River Rockwood Geo Pro 20BHS
    With the Forest River Rockwood Geo Pro 20BHS having a dry tongue weight of 495lbs I recommend going with the Fastway e2 Weight Distribution # FA94-00-1061. The dry tongue weight does not account for the 40lbs of propane added to the tanks or the 50lbs for the Battery # BRW34FR and Box # 329-HM300BKS. And with the majority of the storage being at the front of the camper it is going to be best to have the 600-1,000lb system for your Rockwood. You will likely be surprised how quickly the tongue...
    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...
  • 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 necessarily...
    view full answer...
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Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video Edited:
Joshua S
Employee Cole B
Installed by:
Cole B
Employee Shane H
Installed by:
Shane H
Employee Wilson B
Updated by:
Wilson B
Employee Daron K
Edited by:
Daron K
Employee Brian T
Written by:
Brian T
Employee Michael B
Video by:
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