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Commercial Grade Battery Box for Group 4D Batteries - Vented
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NOCO

Commercial Grade Battery Box for Group 4D Batteries - Vented

Part Number: 329-HM408
139 Reviews | 15 Questions
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$128.76
Retail:$215.99
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noco battery boxes camper box equipment marine trailer 1 329-hm408
noco battery boxes 1 329-hm408
noco battery boxes camper box equipment marine trailer
noco battery boxes camper box equipment marine trailer commercial grade for group 4d batteries - vented
noco battery boxes group 4d 1 329-hm408
noco battery boxes group 4d 329-hm408
noco battery boxes camper box equipment marine trailer group 4d
noco battery boxes camper box equipment marine trailer group 4d
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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 knobs. Reinforced handles for safe grip. Molded plastic is impact and UV resistant. 1-800-940-8924 to order NOCO battery boxes part number 329-HM408 or order online at etrailer.com. Free expert support on all NOCO products. Great prices and Fastest Shipping for Commercial Grade Battery Box for Group 4D Batteries - Vented. Battery Boxes reviews from real customers.
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NOCO Battery Boxes - 329-HM408

  • Camper Battery Box
  • Equipment Battery Box
  • Marine Battery Box
  • Trailer Battery Box
  • Group 4D
  • 1 Battery
  • 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 knobs. Reinforced handles for safe grip. Molded plastic is impact and UV resistant.


Features:

  • 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, commercial equipment, and generators
  • Rugged, molded plastic is resistant to impact, UV rays, oil, gas, and battery acid
    • Maintains impact resistance in extreme conditions down to -20 F
  • Internal bumpers keep battery in place to prevent shifting and jolting
  • Ventilated lid secures to container with 2 bolt-down knobs
    • Multiple exit points allow dangerous acid vapors to be released safely
  • 8 Cable ports provide multiple battery wiring options with heavy gauge wire (4 AWG to 0 AWG)
  • 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


Specs:

  • Application: 12-volt marine, RV, and commercial lead-acid SLA batteries
  • Battery size: group 4D
  • External dimensions: 24-11/16" long x 13" wide x 14" tall
    • Internal dimensions: 21-3/16" long x 9-5/8" wide x 11-1/8" tall
  • Mounting base dimensions: 22-15/16" long x 11-7/16" wide
    • Mounting hole diameter: 5/16"
  • Temperature range: -20 F - 320 F
  • Weight: 7.7 lbs
  • 1-Year limited warranty


NOCO HM408 Group 4D Commercial Battery Box Dimensions



HM408 NOCO Commercial Grade Battery Box for Group 4D Batteries







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Customer Satisfaction Score:

Ratings & Reviews

4.6

139 reviews
5 Stars
(107)
4 Stars
(19)
3 Stars
(4)
2 Stars
(2)
1 Star
(7)
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by:
Great fit for a lithium upgrade — minor mod required

Installed this in my 2023 Flagstaff Microlite 25FKS to replace the factory lead-acid battery, now housing a 12V 300Ah lithium (Litime) battery instead. Installation was straightforward overall — I did need to fabricate a small steel plate to adapt the mounting to where my old lead-acid battery sat, but that was a minor, quick modification.

The big win for me was keeping all the storage space inside the rig free rather than losing a compartment to the battery — this mounts on the front exterior tongue area, so my interior storage stays untouched. Solid plastic construction, ventilated lid, and plenty of room for the cables. Would recommend for anyone doing a similar lithium conversion who wants to keep their battery outside the living space.
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by:
I used this box to mount two 34M batteries on my RV on the trailer tongue. There was enough room to set the two batteries side by side. Worked well for this application.
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Lazer S. profile picture
Etrailer Expert

Lazer S.

1/13/2026

Nice! Glad it's working well for you. : ) What kind of camper did you install it on?

Larry profile picture

Larry

1/13/2026

@LazerS It’s a Grand Design Imagine 2150RB
by:
Received on time but came in the box with a defective hole that will leak. Etrailer immediately sent a new one and a return label for the old one. The new one arrived with both holes routed out! Poor quality control
by:
Exactly what I needed. Very substantial battery box for my new lithium iron phosphate battery.
by:
It's plenty solid. I was concerned about getting it into the space on the tongue, but it fits. It's larger than I need for a single 300AH lithium battery, but large is better than small. I just wish battery box makers and lithium battery makers would coordinate on sizes.
by:
Bought to fit an eco-worthy 280ah lithium battery.
Fits great and does its job.
Read reviews of the cover holes not lining up, this is true.
Elongating the holes was needed but not that difficult.
by:
Holes on the cover dont line up with the box to bolt the cover had to modify little. Fits the wattcycle 314Ah mini really well
by:
Screw knob holes in lid were misaligned, had to drill new ones.
by:
Exactly as advertised and great service from the company. I would buy again and recommend to friends.
Alice profile picture

Alice

4/25/2026

Excellent, very versatile and well-made product. I’ve used it for over a year. I recommend for in my case it was for Marine storage. I store my battery in it. It’s great for recharging without having to remove the battery all the time.

by:
This battery box is a solid choice for anyone needing a durable and well-constructed enclosure for their Group 4D battery. The build quality is excellent, with sturdy materials that feel reliable for long-term use. The vented design allows for proper airflow, helping to manage heat and gases effectively.

One of the standout features is the lid, which is secured with thumb screws. This makes it easy to remove when needed while ensuring a secure fit when closed. Accessing the battery is straightforward, and the overall design is well thought out for practical use.
Victoria H. profile picture
Etrailer Expert

Victoria H.

2/21/2025

Thanks for the detailed feedback, David! I know your insight will be helpful to someone shopping this part in the future!

by:
This is a case of "you get what you pay for". This battery box is certainly not the most expensive nor is it the cheapest. But it is in the middle. It is VERY well made and will fit my needs great. I have had the cheap boxes and this is far better and worth the extra money. The shipping was very fast and the customer service was top notch. THANK YOU.
by:
Fast, efficient delivery. Product arrived, exactly as expected.
by:
Excellent quality
by:
I think overall a good product. The only problem is the holes in the lid don’t match the base, I’m going to have to egg out the holes so the knobs will work, hopefully it doesn’t compromise the seal for water
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Lazer S. profile picture
Etrailer Expert

Lazer S.

6/16/2026

Sorry about that Wayne. I will have our stock checked to make sure they aren't all like that. As to your concern about it no longer being water tight, I don't think it will be a problem. The knobs have rubber gaskets that go in them and should create a good seal. What are you going to install this on?

by:
Excellent quality. Finding an external box to hold 280 ah battery was a challenge. This fit perfectly on our imagine
by:
Sure got here fast
by:
Well it’s better than I expected and it’s going to work out great on the tongue of my new camper to hold my two batteries. I will be able to run all the cables inside and make it look like a professional installation. Thank you
by:
Great for a large lithium battery
by:
There are two holes on top of the box and on the lid there was much larger holes than are needed for the screws. In all water will get into the box and there is not a drain. If I cannot get a work around for it I will return the box.
by:
The holes in the top of the box to secure the lid with bolts do not line up. No way to get the top secured with the bolts without cutting large holes in the lid. I reported this to customer service and they immediately sent out a another one. It arrived today with the same problem. If you are planning to use the lid as designed, good luck! I would search for an alternative product.
by:
Working with your company was a very positive experience especially working with Paula S. Her attention to detail, follow-up, and overall customer service was exemplary. I wish every company that we worked with had employees like her. We are an OEM engineering company and we needed supply chain planning for some volume on future orders. Paula S. guided us through the process. We will be doing a lot more business with eTrailer.com.
by:
Upgraded our camper battery to lithium requiring a new battery box. Product has performed as advertised. No regrets
by:
tough! And big! I will consolidate both batteries in this box and will protect them for years!
by:
Great box for our 250ah lithium battery. I’m going to weld brackets to secure it to trailer and around box to prevent theft.
by:
etrailer is great. Shipping was on time and customer service on par. I've tried other companies and been very disappointed with communications especially when it comes down shipping. Thanks.
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Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Dustin K
Video by:
Dustin K
Employee Cole B
Installed by:
Cole B
Employee David F
Installed by:
David F
Employee Chris R
Video Edited:
Chris R
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

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