Deka Duration DD300-12 Specifications
| Model | DD300-12 |
| Capacity | 300Ah |
| Voltage | 12V |
| Chemistry | LiFePO4 (Lithium Iron Phosphate) |
| Efficiency | 99% |
| Cycle Life | 6,000 cycles at 80% DoD |
| Usable Depth of Discharge | 100% |
| Dimensions | 19.69" L x 10.43" W x 9.2" H |
| Weight | 81.8 lbs |
| Max Discharge Current | 300A Recommended, 1000A Peak for 5 seconds |
| Operating Temperature | -4°F to 140°F (-20°C to 60°C) |
| IP Rating | IP67 |
| Built-in BMS | Internal with Smart Communication |
| Certifications | UN38.3, UL 1973, IEC62619, CE |

 MAPPS® NEMA 3R enclosure with dual Deka Duration LiFePO4 batteries and pre-wired charge controller, ready for field deployment.
DEKA Duration DD300-12 12V 300Ah LiFePO4 Battery
SKU DEKA-LFP-DD300-12
Deka DD300-12 Monobloc LFP Battery
The Deka Duration DD300-12 is a drop in replacement for Group 8D VRLA batteries and delivers 300Ah of LFP energy storage at 12.8V nominal, providing 3.84 kWh of usable capacity for commercial energy storage, industrial backup power, large-scale off-grid solar, and marine applications. With 99% round-trip efficiency and 100% usable depth of discharge, this monobloc battery captures significantly more usable energy per cycle than traditional lead-acid batteries.
The DD300-12 delivers exceptional long-term value with reduced replacement frequency. The sealed ABS+PC fire-rated enclosure with IP67 rating provides reliable protection in demanding outdoor installations, while included busbars simplify terminal connections for scalable parallel and series configurations.
Deka Duration DD300-12 Battery Features
- LiFePO4 Chemistry: 12.8V nominal lithium iron phosphate cells deliver 99% round-trip efficiency with 100% usable depth of discharge.
- Integrated BMS: Internal Battery Management System provides short circuit protection, over-discharge voltage cutoff, cell balancing, and smart communication.
- 6,000 Cycle Life: Rated for 6,000 cycles at 80% depth of discharge, delivering long service life with lower replacement frequency and reduced total cost of ownership.
- Drop-in Replacement: Group 8D footprint with M8 bolt threaded insert terminals allows direct replacement of existing lead-acid batteries. Supports up to 16 in parallel or 4 parallel by 4 series configurations.
Deka Duration Smart LFP Technology

Deka Duration LiFePO4 batteries feature integrated smart BMS technology enabling battery-to-inverter and battery-to-battery communication for optimized system coordination and monitoring. The passive cell balancing system maintains individual cell health throughout the battery's 6,000-cycle lifespan, ensuring consistent performance across the entire pack.

Deka Duration DD300-12 Technical Review
The Deka Duration DD300-12 is a 12V, 300Ah lithium iron phosphate (LiFePO4) battery delivering 3.84 kWh of usable energy storage, engineered for commercial, industrial, marine, and large-scale off-grid solar applications requiring high-capacity deep-cycle performance. The integrated Battery Management System performs cell balancing, short circuit protection rated at 1200A with 500 microsecond response time, over-discharge protection, and intelligent battery-to-inverter communication.
Scalable system configurations support up to 16 units in parallel or mixed parallel-series arrangements with included busbars for simplified terminal connections. UL 1973, UN38.3, IEC62619, and CE certifications confirm the battery's safety and compliance across global markets, delivering confidence for utility providers, renewable energy integrators, and commercial installations.
Contact Us Today Get a Free System Quote Toll Free: 877-297-0014

MAPPS® Systems: Now Available with Deka Duration LiFePO4

MAPPS-50-108-12
12 VDC pole-mounted system with SES 20J-V 20W solar module and side-of-pole HPM mount. Drop-in Deka Duration LiFePO4 replaces the 8GU1H gel cell at 36 Ah capacity.
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MAPPS-300-265-24
24 VDC pole-mounted system with 2x SES 150J-V modules on an SPM2-150 side-of-pole mount. Drop-in Deka Duration LiFePO4 replaces the 8G8D gel bank at 265 Ah capacity.
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MAPPS-1200-1060-24-PAD
24 VDC pad-mounted system with 6x SES 200J-V modules on a low-profile ground mount. Drop-in Deka Duration LiFePO4 replaces 8x 8G8D gel cells at 1,060 Ah capacity.
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