Noco | Battery Box for Group 27 Batteries | BG27 | Black | Replaces HM327BK
Noco | Battery Box for Group 27 Batteries | BG27 | Black | Replaces HM327BK
The NOCO BG27 (formerly HM327BKS/HM327BK) Heavy-Duty Snap-Top Battery Box is a rugged, marine and RV-grade battery storage solution designed to safely secure and protect standard Group 27 batteries in demanding environments.
Please note: The older NOCO HM327BKS / HM327BK part numbers have largely been phased out and replaced by the newer current-production BG27 model. The BG27 is the direct replacement and maintains the same overall fitment, dimensions, and mounting footprint while incorporating updated design improvements including reinforced honeycomb construction and improved cable routing.
Features & Specifications:
• Fits standard Group 27 batteries
• Direct replacement for legacy NOCO HM327BKS / HM327BK battery boxes
• Heavy-duty reinforced plastic construction with updated honeycomb structural design
• Snap-top locking lid for secure battery containment
• Improved multi-direction cable entry ports for cleaner wiring installation
• Fully vented design for improved airflow and battery ventilation
• Resistant to acid, oil, gas, UV exposure, and other harsh environmental conditions
• Reinforced integrated carrying handles for easier transport
• Includes hold-down strap and mounting hardware (varies by packaging)
• Ideal for RV, marine, trailer, camper, off-grid, and automotive applications
• Meets USCG 183.420 and ABYC E-10.7 marine safety standards
• Cold impact rated to -20°F
Dimensions:
• Internal Dimensions: 13-3/16" L x 7-3/16" W x 10-1/8" H
• External Dimensions: 16-15/16" L x 9-13/16" W x 11-1/2" H
Side By Side Comparison (Updated BG27 - Legacy HM327BK / HM327BKS
| Feature | NOCO BG27 Group 27 Battery Box | NOCO HM327BKS Group 27 Battery Box |
|---|---|---|
| Intended battery size | Group 27 | Group 27 |
| Internal dimensions | 13-3/16" L × 7-3/16" W × 10-1/8" H | 13-3/16" L × 7-3/16" W × 10-1/8" H |
| External dimensions | 16-15/16" L × 9-13/16" W × 11-1/2" H | 16-15/16" L × 9-13/16" W × 11-1/2" H |
| Material | Reinforced plastic with newer honeycomb reinforcement | Reinforced plastic |
| Lid style | Updated SnapTop locking lid | Original SnapTop locking lid |
| Cable routing | Improved multi-direction cable entry ports | Standard side/front routing |
| Ventilation | Full-flow vented | Full-flow vented |
| Chemical resistance | Acid, oil, gas, UV resistant | Acid, oil, gas, UV resistant |
| Cold impact rating | -20°F | -20°F |
| Certifications | USCG 183.420 / ABYC E-10.7 | USCG 183.420 / ABYC E-10.7 |
| Handles | Reinforced carry handles | Reinforced carry handles |
| Strap included | Usually yes | Usually yes |
| Best use | Current-production replacement | Legacy/original version |
The NOCO BG27 is the newest current-production version of NOCO’s proven Snap-Top battery box design and is the updated replacement for older HM327BK and HM327BKS models.