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Snap-Top Battery Box with Strap for 6V Batteries - Vented

Snap-Top Battery Box with Strap for 6V Batteries - Vented

Item # 329-HM306BKS
Our Price: $25.36
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Shipping Weight: 3 lbs
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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. 1-800-940-8924 to order NOCO battery boxes part number 329-HM306BKS or order online at Free expert support on all NOCO products. Great prices and Fastest Shipping for Snap-Top Battery Box with Strap for 6V Batteries - Vented. Battery Boxes reviews from real customers.
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  • Reviews (24)
  • Q & A (0)
  • Videos (3)
  • Photos

NOCO Battery Boxes - 329-HM306BKS

  • Camper Battery Box
  • Equipment Battery Box
  • Marine Battery Box
  • Trailer Battery Box
  • 6V Batteries
  • 14-1/8L x 10-5/8W x 12-7/16D 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 54" 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: 6-volt automotive, marine, and RV lead-acid SLA batteries
  • Battery size: group 6-volt
  • Battery box dimensions:
    • External dimensions: 14-1/8" long x 12-7/16" tall x 10-5/8" wide
    • Internal dimensions: 10-5/8" long x 11-3/16" tall x 7-5/8" wide
  • Compatible battery size:
    • Maximum: 10-5/8" long x 11-3/16" tall x 7-5/8" wide
    • Minimum: 8-5/8" long x 9-5/8" tall x 5-5/8" wide
  • Box strap length: 54"
  • Temperature range: -20 F - 320 F
  • Weight: 2.6 lbs
  • 1-Year limited warranty

NOCO HM306 6-Volt Snap Top Battery Box Dimensions

HM306BK NOCO Snap-Top Battery Box for 6-Volt Batteries

Replaces Powerhouse PH13228

Installation Details 329-HM306BKS Installation instructions

California residents: click here

Video of Snap-Top Battery Box with Strap for 6V 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 Satisfaction Score:

Customer Reviews

Snap-Top Battery Box with Strap for 6V Batteries - Vented - 329-HM306BKS

Average Customer Rating:  5.0 out of 5 stars   (24 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 switched my camper from one 12 volt battery to two 6 volt golf cart batteries. These battery boxes worked great!!


Boxes are installed and wired. Ready to camp with real deep cycle


I replaced the single 12v car battery on my trailer with two 6v golf-cart batteries. These battery boxes fit perfectly and were very reasonably priced.



Almost 1 full camping season has passed since I installed these. They are trouble free and have held up well.


This Battery Box from NOCO fit my GC-2 6V Golf Cart Batteries perfectly.
It is very durable and comes complete with a snap lid cover and additional strap to keep the cover on tight. I have a set of 4 installed in the front of my 5th wheel, due to the design of the box it was easy to layout and not take up much greatly needed space.


Thanks. This one arrived not broken. Thanks for sending the replacement so fast.


I recently received 2 of these 6 volt battery boxes from eTrailer. Dena was excellent in helping me figure out that the exterior dimensions of the boxes shown on the web site were from the top of the boxes and not at the bottom. I was crossing fingers they would fit on the front of my travel trailer. They do! I will have to trim off the handles on both boxes on one side each as it's a tight fit to have both boxes on the frame end to end...but they will fit nice and snug. Perfect! I'm grinning!

My thanks to Dena and the good folks at I've been doing business with them since 2008...and they haven't let me down once!


I haven't had a chance to use the battery cases and tongue weight scale but the appearance is as advertised and they both look to be sound products. One bit of feed back on the shipping box. There were way more box staples used than needed (about 16) and I'm sure the shipping tape alone would have been adequate. Hard to open the box with all those staples and they can be dangerous when they come out of the box when opening.

Great service and fast shipping. Thank you.


I like buying from I only need small stuff for a travel trailer or small cargo trailer. But, they have it, it is correctly and completely described on the web site and it is delivered on time. This battery box is a good example. Inside and outside dimensions are given on the web site and it is a good quality box. And, price is consistent or better than at other suppliers.


Good sturdy box. I’ve been using it for 6v golf cart batteries for a year now and no complaints. Would buy again. I drilled a few drain holes in the bottom just in case water happened to work it’s way into the box.


Just what we needed to put two golf cart batteries on the front of our Arctic Fox. Tucked in perfectly.


Easily fit my new Crown CR220 6v deep cycle batteries. Same basic dimensions as my old 12v battery boxes, just taller.


Worked great for our campers solar syst em


Perfect fit, exactly what I ordered.


Got product well ahead of schedule. Fit my 6v batteries perfectly.


Does a great job so far.


Exactly what I needed to rewire my vintage trailer.


Easy ordering ,fast shipping and good quality items!


Everything was as stated. Ordered Two and they worked great!


The packaging of the two pieces was expensive looking.


Fast delivery and quality product






See what our Experts say about this NOCO Battery Boxes

  • Overall Exterior Dimensions Of The NOCO Battery Box # 329-HM306BKS
    The NOCO Battery Box for 6 Volt Batteries - Snap Top # 329-HM306BKS has overall exterior dimensions including the lid of 14-1/8" long x 10-5/8" wide x 12-3/8" deep. This polypropylene plastic battery box will protect your battery from damage and your golf cart from battery acid if the battery fails.
    view full answer...
  • Battery Box to Hold an 11 Inch Tall 6 Volt Golf Cart Battery
    Battery boxes are universal items since batteries vary in size so when looking at them you need to make sure your battery will fit. The original battery box we had for 6 volt golf cart batteries only had a internal dimension of 9-1/4 inches so it would not fit your battery, like you said. The current box we have is the NOCO, part # 329-HM306BKS, which is taller measuring 10-5/8 inches long, 7-5/8 inches wide, and 11-3/16 inches deep. As long as it's still long enough this battery box...
    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 # PK5231201. 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...
  • 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...
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  • Battery Boxes Capable Of Holding 6V LifeLine Battery GPL-4CT On Trailer Tongue
    For 6-volt battery boxes we have a couple options to hold your two 6V lifeline GPL-4CT batteries. I was able to see that this battery is 10.28" long, 7.06" wide and 9.92" tall. First is the single Snap-Top Battery Box # 329-HM306BKS which has interior dimensions of 10-5/8" long, 7-5/8" wide and 11-3/16" tall. The exterior dimensions are 14-1/8" long, 10-5/8" wide and 12-7/16" tall. A step up is the Commercial Grade Battery Box # 329-HM426 which is a increase in toughness and is designed...
    view full answer...

Do you have a question about this Battery Box?

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 Alex H
Updated by:
Alex 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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