Epoch 12V 300Ah Pro Series Dual Purpose DP12300H | Cranking & Deep Cycle LiFePO4 Battery (3.84kWh) | Heated, Bluetooth, IP67, Group 8D

The Epoch 12V 300Ah Pro Series Dual Purpose battery (DP12300H) is built to start compatible outboards and power your house loads from one high-capacity BCI Group 8D marine lithium battery. It is engineered for boaters and RV owners who need both cranking power and deep-cycle runtime.

You get 1,000A peak cranking current for up to 5 seconds, 300Ah (3.84kWh nominal), an IP67 dust-tight enclosure rated for temporary immersion, Bluetooth monitoring in the Epoch Pro app, CAN Link ports and internal heating in an 81 lb Group 8D case. In compatible systems it can replace separate lead-acid starting and house batteries, and it is rated for 6,000+ cycles with an 11-year manufacturer warranty when registered within 90 days of purchase.

Key Features

• 12V 300Ah Group 8D dual-purpose LiFePO4 (3.84kWh nominal): Engine cranking plus deep-cycle house power in one BCI Group 8D case, 19.7 x 10.5 x 9.75 in (500 x 267 x 248 mm), 81 lb (36.7 kg). Not a drop-in replacement for every lead-acid installation: verify tray fit, terminal clearance, cabling, overcurrent protection, charger profile and engine and alternator compatibility.
• Cranking power: 1,000A for up to 5 seconds and 800A for up to 10 seconds, for engine cranking and short start-up surges (tested above 60% state of charge at 25°C). Rated by peak current and duration, not CCA, so verify the engine maker's battery requirements; Epoch cites compatibility with 250 hp outboards from leading brands when the engine's battery requirements, alternator, wiring and charging profile are matched.
• 300A continuous output: 300A continuous discharge (150A recommended for daily use) for house loads and 3,000W-class inverter systems (300A is about 3,840W of DC input). Keep enough charge in reserve to start the engine.
• Charging: 300A maximum from all sources combined, up to 150A recommended; 14.2V bulk/absorption (14.2-14.6V range), 13.8V float (13.4-13.8V range; off preferred where the charger allows), equalization and temperature compensation disabled. 15.4V is a listed maximum, not a charger target. Use the Epoch 12V 50A Lithium Battery Charger or another LiFePO4 charger, and a DC-to-DC charger or lithium-ready regulation for alternators.
• Self-heating: With a charger connected in cold weather, the internal heating film warms the battery to 10°C (50°F) before charging starts, so it charges from -20°C to 55°C (-4°F to 131°F); it discharges from -20°C to 60°C (-4°F to 140°F).
• IP67 enclosure: Dust-tight and protected against temporary immersion to 1 m for 30 minutes. Not for submersion, water jets or pressure washing. Mount it upright in a dry, ventilated spot where standing water cannot collect (not in a bilge).
• Bluetooth: The free Epoch Pro app (iOS and Android) shows state of charge, voltage, current, temperature and status alerts, sets up multi-battery networks and installs firmware updates over the air.
• CAN networking: CAN Link in and Link out ports network a bank and connect external devices; for Victron systems or NMEA 2000 networks, Epoch offers the Pro Series communications box (contact Epoch for configuration support).
• Series and parallel: Up to 4 in series (48V class) or 16 in parallel at 12V (4,800Ah, 61.44kWh); with batteries in series, up to 4 strings in parallel (4S4P maximum: 51.2V, 1,200Ah, 61.44kWh). Use matched DP12300H batteries within 0.5V of each other.
• Smart BMS: Overcharge, over-discharge, over-current, short-circuit (cutoff at 1,200A within 500µs) and high/low temperature protection. Install a DC-rated main fuse or breaker close to the positive terminal.
• 6,000+ cycles and 11-year warranty: 6,000+ cycles (0.2C, 80% DoD, to 80% of initial capacity, 25°C). No watering or acid service; inspect it routinely. 11-year manufacturer warranty; register within 90 days of purchase.

Key Benefits

• IP67 - Waterproof: Dust-tight and protected against temporary immersion to 1 m for 30 minutes.
• 6,000+ - Cycle life: Over 16 years at one full cycle a day. Rated at the depth of discharge, charge rate and temperature stated on the datasheet, to its end-of-life capacity.
• iOS + Android - Bluetooth app: Charge, voltage and temperature on your phone in the Epoch Pro app.
• Advanced BMS - Protection: Guards against overcharge, over-discharge, overcurrent and short circuit.
• Self-heating - Cold weather: Warms its cells before charging, so it can charge in freezing weather.
• LiFePO4 - Thermal stability: Lithium iron phosphate has a far lower thermal-runaway risk than other lithium chemistries. The BMS adds over-temperature and low-temperature charge protection.
• 300Ah: Capacity
• 3.84kWh: Stored energy
• 1,000A: Peak cranking
• 300A: Continuous output
• IP67: Immersion-rated
• 81 lbs: Weight
• 11-year warranty: Manufacturer coverage
• Pro Series: High-output platform
• Bluetooth app: Real-time monitoring
• CAN networking: Link in / Link out ports
• IP67 rating: Dust-tight, temporary immersion
• 6,000+ cycles: Long service life

The ultimate dual-purpose powerhouse for boats and RVs

Start your engine, run your electronics and simplify your 12V power system.

Standard lithium deep-cycle batteries are not designed for the intense surge demand of a starter motor. This Epoch Pro Series battery is different. Its high-output BMS is engineered for compatible cranking applications while still delivering a massive 300Ah of deep-cycle storage for house loads, marine accessories, RV systems and off-grid power.

Instead of maintaining one battery for starting and another bank for house loads, this single Group 8D marine lithium battery can simplify wiring, reduce maintenance, save weight and provide the confidence needed for long days on the water.

• High-surge engine cranking: Start compatible outboards with up to 1,000A peak output. The Epoch Pro Series BMS delivers 1,000A for up to 5 seconds and 800A for up to 10 seconds for engine cranking and short start-up surges (tested above 60% state of charge at 25°C). It is rated by peak current and duration rather than CCA, so check the engine maker's battery requirements. Epoch specifically calls out compatibility with 250 hp motors from leading outboard brands when the complete electrical system is properly matched.
• 300Ah deep cycle capacity for house loads: Run electronics and accessories without constant voltage drop. Once the engine is off, 3.84kWh (nominal; plan runtime on about 3,072Wh) of LiFePO4 energy, within 300A continuous (150A recommended), can power multiple displays, sonar, radar, marine audio, pumps, livewells, lighting, refrigeration and other onboard loads while maintaining the stable voltage curve lithium batteries are known for.

Ditch the dead weight: a lighter Group 8D upgrade

Replace heavy Group 8D lead-acid power with a lighter, smarter lithium platform.

• Save about 49-79 lb: Traditional Group 8D lead-acid and AGM batteries often weigh around 130-160 lbs. The Epoch 12V 300Ah lithium battery weighs 81 lb (36.7 kg). It needs no watering or acid service; inspect it routinely.
• Exact physical fitment: The Group 8D footprint measures 19.70 in L x 10.5 in W x 9.75 in H (500 x 267 x 248 mm). It is not a drop-in replacement for every lead-acid installation: always confirm your tray, cable clearance, terminal orientation, hold-downs and lid clearance. Mount it upright; never on its side or upside down.

Rugged marine tech and unmatched protection

Immersion-rated, heated, connected and built for serious systems.

• IP67 dust-tight and cold-weather heated: The IP67-rated enclosure is dust-tight and protected against temporary immersion to 1 m for 30 minutes; it is not rated for submersion, water jets or pressure washing, so install it where standing water cannot collect (not in a bilge). With a charger connected in cold weather, the internal heater warms the battery to 10°C (50°F) before charging, so it charges down to -20°C (-4°F).
• Smart app monitoring and CAN networking: The free Epoch Pro app shows state of charge, voltage, current, temperature and status alerts, and installs firmware updates over the air. CAN Link in and Link out ports network a bank; for Victron systems or NMEA 2000 networks, Epoch offers the Pro Series communications box.

Battery features

Pro Series lithium performance with cranking power, deep-cycle runtime and smart communications.

• Dual-purpose marine battery: Designed for compatible outboard cranking and long-duration deep-cycle energy storage.
• 1,000A peak discharge: Provides up to 1,000A for 5 seconds and 800A for 10 seconds for high-surge starting loads.
• 300Ah deep-cycle lithium capacity: Stores 3.84kWh for fish finders, livewells, pumps, lights, audio, refrigeration and RV house loads.
• 300A continuous BMS: Supports high current charging and discharging for serious 12V power systems (150A recommended).
• IP67 enclosure: Dust-tight and protected against temporary immersion to 1 m for 30 minutes; not for submersion.
• Integrated heating: With a charger connected, warms the battery to 10°C (50°F) before charging, down to -20°C (-4°F).
• Bluetooth monitoring: The free Epoch Pro app for iOS and Android, with over-the-air firmware updates.
• CAN networking: Link in / Link out ports; Victron and NMEA 2000 through the Pro Series communications box.
• Group 8D footprint: Designed around a 19.70 in x 10.5 in x 9.75 in format for compatible Group 8D trays.
• 81 lb lightweight upgrade: Cuts significant weight compared with many traditional 130-160 lb Group 8D lead-acid or AGM batteries.
• Series and parallel expansion: Supports up to 4 in series and up to 16 in parallel when installed to Epoch specifications (4S4P maximum).
• 6,000+ cycle life: Rated at 0.2C, 80% DoD, to 80% of initial capacity at 25°C. No watering or acid service; inspect it routinely.

Compatible chargers and accessories

Recommended add-ons for charging, monitoring and advanced integration.

• Epoch 12V 50A battery charger: Compatible high-output charger for this Pro Series battery.
• Pro Series 5 in touchscreen display: Optional display accessory for easier battery visibility (sold separately).
• Pro Series communications box: Connects the battery to Victron systems or NMEA 2000 networks (sold separately).
• Lithium charging equipment: Use compatible inverter chargers, converters, solar charge controllers and DC-to-DC chargers programmed to Epoch settings.

Additional information

Magnuson-Moss Warranty Act: a vehicle manufacturer cannot legally void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson-Moss Warranty Act, 15 U.S.C. 2302(C)).

Expandability

• Up to 16 in parallel at 12V (4,800Ah, 61.44kWh)
• Up to 4 in series for 24V, 36V or 48V
• With batteries in series, up to 4 strings in parallel (4S4P maximum: 51.2V, 1,200Ah, 61.44kWh)
• Use matched DP12300H batteries within 0.5V of each other

Communications

• Bluetooth to the Epoch Pro app (iOS and Android) with over-the-air firmware updates
• CAN Link in and Link out ports for bank networking
• Victron and NMEA 2000 connection through the optional Pro Series communications box (sold separately)
• Optional Pro Series 5 in touchscreen display (sold separately)

What Can It Run?

Plan runtime on about 3,072Wh of the battery's 3.84kWh nominal energy.

Stay within 300A continuous (150A recommended), and keep enough charge in reserve to start the engine.

Suitable For:

• 12V outboard starting battery applications where motor, alternator, wiring and charging requirements match
• Dual purpose marine battery systems combining engine starting and house power
• 250 hp outboard applications specifically called out by Epoch, plus other leading outboard brands when properly matched
• Marine house battery replacement for electronics, fish finders, livewell pumps, bilge pumps, audio, refrigeration and lighting
• Group 8D lead-acid replacements where the tray, hold-down, cable clearance, charging system and engine requirements are compatible
• RVs, vans, overland rigs and 12V house-power systems needing a 300Ah deep cycle lithium bank
• Solar charge controller, inverter charger, alternator/DC-to-DC and off-grid 12V systems
• 12V parallel banks up to 16 batteries (4,800Ah, 61.44kWh)
• Series systems up to 4 batteries for 24V, 36V or 48V builds using matched batteries and Epoch guidance; with batteries in series, up to 4 strings in parallel (4S4P maximum)
• Marine engine starting, marine house power, marine electronics and sonar, livewell and bilge pumps
• 3,000W-class inverter systems, solar and off-grid systems, cabins and backup power, 24V to 48V banks

Certifications & Standards

• IP67 (IEC 60529): Dust-tight, and protected against temporary immersion in up to 1 m of water for 30 minutes; not rated for water jets or pressure washing. Under IEC 60529 the first digit rates solids and the second rates water.
• UL 1973: The UL standard for batteries in stationary energy storage and auxiliary power. It covers the pack, its BMS and how the system behaves under fault conditions (electrical and thermal abuse, mechanical and environmental tests, fault handling and BMS protection). Certificate of compliance available.
• CE: The manufacturer's declaration that the product meets the European Union's health, safety and environmental requirements (applicable EU safety directives, electromagnetic compatibility, environmental requirements), required to sell it in the European Economic Area.
• RoHS: Complies with the EU Restriction of Hazardous Substances directive (2011/65/EU), which limits lead, mercury, cadmium, restricted flame retardants, phthalates and other toxic materials in electronics, making it safer to handle and recycle.
• UN 38.3: The United Nations test series every lithium battery must pass before it can be shipped by air, sea or road: altitude, thermal and vibration tests; shock, external short-circuit and impact; overcharge and forced discharge.

Please Note: Rated by peak current and duration, not CCA: verify the engine maker's battery requirements, alternator, wiring and charging profile before replacing a starting battery.

Please Note: Keep enough charge in reserve to start the engine.

Please Note: IP67 is not for submersion, water jets or pressure washing; do not install in a bilge or where standing water collects.

Please Note: Mount upright only, never on its side or upside down; install a DC-rated main fuse close to the positive terminal.

Please Note: Not a drop-in replacement for every lead-acid installation: check tray, hold-downs, lid clearance and cable reach.