Essential Series
12V 334Ah Essential Series LiFePO4 Battery (4.28kWh)
$1,299
IP54BluetoothHeated
Capacity: 334Ah
Compatible charger
RecommendedFeatures at a glance
- IP54Splash & dust resistant
Protected against limited dust ingress and water splashes. Not waterproof or submersible.
- 4,000+Cycle life
Over 10 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 + AndroidBluetooth app
Charge, voltage and temperature on your phone in the Epoch Li-Ion app.
- Advanced BMSProtection
Guards against overcharge, over-discharge, overcurrent and short circuit.
- Self-heatingCold weather
Warms its cells before charging, so it can charge in freezing weather.
- LiFePO4Thermal 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.
- 12V 334Ah LiFePO4 Battery (4.28kWh): Massive deep-cycle energy storage designed to maximize off-grid runtimes for RVs, camper vans, marine house banks, and heavy-duty solar setups.
- High-Output Specifications: Effortlessly power large inverters and heavy appliances with a robust 200A Max Continuous Discharge (400A peak for up to 3 seconds), and recharge incredibly fast with a 200A Max Continuous Charge rate.
- HEATED For Extreme Climates: Built-in internal heating supports cold-weather charging down to −20°C (−4°F): below 0°C (32°F), incoming charge current from a connected charger (at least 0.5A) warms the battery, and charging resumes automatically once it reaches 5°C (41°F).
- BLUETOOTH App Connectivity: Monitor real-time state of charge, voltage, current, temperature, and battery status directly from your smartphone in the free Epoch Li-Ion app for iOS and Android. The shunt is built into the BMS, so no external shunt is needed.
- Massively Expandable: Easily scale your power system exactly as you need it by safely connecting up to Max (4) in Series (to build 24V, 36V, or 48V systems) and up to Max (16) in Parallel.
- Advanced Smart BMS: Fully integrated Battery Management System automatically protects your investment from over-charging, over-discharging, over-current, short circuits, and extreme high/low temperatures.
- Optimized Weights & Dimensions: Pack a staggering 4.28kWh of stored energy into a 60 lb BCI Group 31 case, saving incredible weight and physical space compared to wiring together multiple heavy lead-acid blocks.
- 4,000+ Cycle Life & Maintenance-Free: No watering, acid service, or routine lead-acid maintenance (periodic inspection keeps it safe), backed by Epoch’s 11-Year Limited Warranty (3 years of free replacement, then 40% off MSRP on a replacement battery through Year 11).
Configuration
Cell Configuration: 4S1P
Chemistry: LiFePO4
Current
Ah Capacity: 334Ah
Max Continuous Discharge Amps: 200A
Max Charge Current Amps: 200A
Max Discharge Peak Current Amps: 400A (up to 3 Seconds)
Series | Parallel: Max (4) in Series, Max (16) in Parallel
Voltage
Voltage: 12.8V
Max Charge Voltage: 14.6V
Operating Voltage Range: 10.0 - 14.6V
Temperature
Charge Temp Range: -20°C (-4°F) / 55°C (131°F) (with heating)
Discharge Temp Range: -20°C (-4°F) / 60°C (140°F)
Storage Temp: 0°C (32°F) / 35°C (95°F)
Weight: 60 (LBS)
Dimensions
Length: 13.75" @ Base, 15.5" @ Handles (inches)
Width: 7.63" (inches)
Height: 10.00", 10.5" with Terminal Bolts (inches)
BCI Group 31 footprint. Verify tray dimensions, terminals, wiring and charging-system compatibility before installation.
Maximum Continuous Charge Current: 200A
Recommended Charge Current: 167A
Bulk/Absorption: 14.2V-14.4V
Absorption End Condition: Charge current ≤ C/20 (16.7A) or 15 min, whichever comes first
Float Voltage: Disabled (preferred) or 13.3V-13.6V
Re-bulk: 13.2V
Temperature Compensation: 0 mV/°C (off)
Equalization: Disabled
Charger Temperature Limit Setting: 0°C (32°F) / 55°C (131°F), unless the charger has approved cold-charge logic
BMS High Voltage Cutoff: 14.6V
SoC Recalibration: 14.6V
Epoch Li-Ion App
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Applications & use cases
- RV house power
- Camper vans and van life
- Travel trailers and fifth wheels
- Motorhomes and Class A or Class C coaches
- Overlanding and expedition vehicles
- Marine house power
- Trolling motors
- Marine electronics and fish finders
- Yachts and large cruising boats
- Off-grid solar systems
- Solar battery banks and inverter systems
- Home energy storage and backup power
- Cabins and remote power systems
- Camping and emergency power kits
- Ham radio and communications backup
- Commercial fleet and specialty power systems
RV · Marine · Van conversion · Off-grid storage
Epoch 12V 334Ah RV & Marine Lithium Battery: Massive Off-Grid Power
The Epoch 12V 334Ah lithium battery is a high-capacity RV deep cycle lithium battery and marine LiFePO4 battery built for serious off-grid runtime, delivering 4.28kWh of stored 12V energy in one heated Bluetooth power source.
Designed for RV owners, van lifers, boaters, and solar installers who want to simplify large 12V power banks, this high-capacity 12V lithium battery replaces multiple smaller batteries with one clean drop-in RV replacement. It combines 200A continuous output, internal heating, Bluetooth battery monitor visibility, IP54 protection, and smart BMS protection for dependable house-power storage.
334Ah
Capacity
4.28kWh
Stored energy
200A
Continuous output
60 lb
Battery weight
IP54
Splash-resistant
Built to go further
11-year limited warranty3 yrs free replacement
Internal heatingCold-weather charging support
Bluetooth monitorEpoch Li-Ion app for iOS and Android
Advanced BMSBuilt-in protection
4,000+ cyclesLong-cycle LiFePO4 chemistry
4S / 16P capableScalable system design
The Ultimate Single-Battery Solution
Replace complex multi-battery banks with one high-capacity 12V lithium battery for RV, marine, and van conversion systems.
Simplify large 12V battery banks
A single Epoch 12V 334Ah battery reduces the need to daisy-chain multiple 100Ah batteries together. Fewer interconnects can mean cleaner installs, fewer resistance points, and more usable space in RV storage bays, van builds, and boat compartments.
4.28kWh off-grid storage
With 334Ah of capacity and 4.28kWh of stored energy, this battery is built for high-capacity 12V lithium storage across RV house power, marine electronics, solar systems, backup loads, and extended off-grid living.
Drop-in RV replacement planning
The large-format case measures 13.75 in long at the base, 7.63 in wide, and 10.0 in high. Allow 15.5 in of length at the handles and 10.5 in of height with terminal bolts when checking compartments and cable clearance.
Power Heavy Loads with Smart Monitoring
Stable LiFePO4 voltage, Bluetooth visibility, and smart BMS protection for mobile off-grid power.
Power high-draw appliances with ease
The 200A continuous discharge rating supports properly designed 12V inverter systems for appliances, tools, galley loads, pumps, electronics, and off-grid equipment. The 400A peak rating, for up to 3 seconds, supports short surge demands within BMS limits.
Smart Bluetooth app monitoring
Use the Epoch Li-Ion app on compatible iOS and Android devices to check state of charge, current, voltage, temperature, and battery status from your smartphone—ideal for RV travel, van life, and marine house-power systems.
Rugged, safe, and maintenance-free
LiFePO4 chemistry is sealed, maintenance-free, and built for deep-cycle power without watering, acid checks, or routine lead-acid service. The advanced BMS helps protect against overcharge, over-discharge, over-current, short circuit, and temperature extremes.
Built for Cold Weather, RV Bays & Marine House Power
Heated 12V lithium battery performance with splash-resistant IP54 protection.
Internal heating for cold-weather charging
Built-in heating supports safe charging in cold conditions: below 0°C / 32°F, charging pauses while incoming charge current from a connected charger (at least 0.5A) warms the battery, and charging resumes automatically at 5°C / 41°F. The listed charge temperature range is -20°C to 55°C / -4°F to 131°F with heating.
IP54 dust and splash protection
The IP54 enclosure is dust-protected and splash-resistant for everyday RV, marine, mobile, and outdoor use. It is not designed for submersion or pressure washing.
60-lb high-capacity lithium design
At 60 lb, this high-capacity 12V lithium battery delivers large-bank energy density without the weight, maintenance, and installation complexity associated with traditional lead-acid storage.
Built for RV, Marine, Van Life & Off-Grid Systems
A high-capacity RV deep cycle lithium battery and marine LiFePO4 battery for serious 12V house-power systems.
- ✓RV, camper, travel trailer, and motorhome house-power systems.
- ✓12V lithium battery for van conversion and overland auxiliary power systems.
- ✓Marine LiFePO4 battery banks for electronics, pumps, lighting, navigation, and house loads.
- ✓Solar and off-grid energy storage for cabins, trailers, boats, and backup systems.
- ✓Large 12V inverter systems where load calculations stay within the 200A continuous output limit.
- ✓24V, 36V, and 48V systems using matched batteries in series, up to manufacturer limits.
Scalable 12V, 24V, 36V & 48V Power
Expand with matched batteries for larger RV, marine, solar, and backup energy banks.
Up to 4 in series
Wire matched batteries in series for 24V, 36V, or 48V systems when using compatible full-bank charging equipment and proper system-level protection.
Up to 16 in parallel
Parallel expansion can build extremely large 12V banks. Use matched batteries, equal cable lengths, common busbars, branch fusing, and appropriate disconnects.
4,000+ cycles and 11-year limited warranty
The LiFePO4 design offers long-cycle, maintenance-free power backed by Epoch’s 11-year limited warranty (3 years of free replacement, then 40% off MSRP on a replacement battery through Year 11) for this Essential Series model.
Technical Specifications
Key specifications for the Epoch 12V 334Ah Essential Series LiFePO4 Battery.
| Battery specifications | |
|---|---|
| Brand | Epoch Batteries |
| Product name | Epoch 12V 334Ah Essential Series LiFePO4 Battery |
| Model / SKU | 12334A-H |
| Primary use | Deep-cycle RV, marine, van, solar, backup, and 12V house-power systems |
| Group size | BCI Group 31 |
| Nominal voltage | 12.8V |
| Nominal capacity | 334Ah @ 0.2C |
| Stored energy | 4.28kWh / approx. 4,275Wh |
| Chemistry | LiFePO4 / Lithium iron phosphate |
| Cell configuration | 4S1P prismatic LiFePO4 |
| Max continuous discharge | 200A |
| Recommended discharge current | 167A (0.5C) |
| Max continuous charge | 200A |
| Recommended charge current | 167A (0.5C) |
| Peak discharge | 400A for up to 3 seconds |
| Operating voltage range | 10.0V – 14.6V |
| Max charge voltage | 14.6V |
| Bulk / absorption voltage | 14.2V – 14.4V |
| Absorption end condition | Charge current ≤ C/20 (16.7A) or 15 minutes, whichever comes first |
| Float voltage | Disabled preferred, or 13.3V – 13.6V |
| Re-bulk voltage | 13.2V |
| Equalization | Disabled |
| Temperature compensation | 0mV/°C (off) |
| Charger temperature limit setting | 0°C to 55°C / 32°F to 131°F, unless the charger has approved cold-charge logic |
| BMS high-voltage cutoff | 14.6V |
| Series connection limit | Up to 4 batteries in series |
| Parallel connection limit | Up to 16 batteries in parallel |
| Maximum configuration | 4S16P; up to 5,344Ah with 16 matched batteries in parallel |
| Bluetooth monitoring | Yes — Epoch Li-Ion app (iOS and Android) |
| Bluetooth security PIN | Printed on the battery’s lid; can be changed in the app (Advanced Settings) |
| Current sensing | BMS-integrated shunt; 0.2A accuracy on discharge |
| Internal heating | Yes — for cold-weather charging |
| Charge temperature range | -20°C to 55°C / -4°F to 131°F with heating |
| Low-temperature charge protection | Charging disabled at 0°C / 32°F; resumes automatically at 5°C / 41°F |
| Heater activation | Charger connected and supplying at least 0.5A; powered by incoming charge current only, never stored battery energy |
| Heating system | Tested to -20°C / -4°F; rated for external ambient down to -40°C / -40°F |
| Discharge temperature range | -20°C to 60°C / -4°F to 140°F |
| Storage temperature | 0°C to 35°C / 32°F to 95°F recommended |
| Long-term storage | Charge to about 50% state of charge or higher; check at least every 3 months |
| Cycle life | 4,000+ cycles |
| IP rating | IP54 per IEC 60529 — dust-protected and splash-resistant; not submersible |
| Dimensions | 13.75 in L at base / 15.5 in at handles × 7.63 in W × 10.0 in H / 10.5 in with terminal bolts |
| Weight | 60 lb / 27.22 kg |
| Terminal | M8 threaded terminal |
| Terminal torque | 8–12 N·m (71–106 in-lb) |
| Warranty | 11-year limited warranty: free replacement in Years 1–3, then 40% off MSRP on a replacement battery in Years 4–11. Register within 90 days or keep your proof of purchase. |
| BMS protection | Overcharge, over-discharge, over-current, short circuit, high and low temperature |
| Cell-level certifications | UL 1642; IEC 62619 (the cells, not the complete battery) |
| Label markings | CE; RoHS; UN 38.3 |
Fitment and charging note
Verify your system before installation.
Always confirm battery tray dimensions, cable clearance, terminal compatibility, charger compatibility, fuse sizing, inverter requirements, and installation location before use. Use a lithium-compatible charger, inverter charger, solar charge controller, converter, or DC-to-DC charger programmed within Epoch’s recommended LiFePO4 charging settings. Do not use lead-acid equalization modes.
Epoch 12V 334Ah Lithium Battery FAQs
Common questions about RV and marine installation, inverter sizing, Bluetooth monitoring, alternator charging, and system expansion.
Is this single 334Ah battery better than wiring three 100Ah batteries together?
Yes. For many RV, marine, and van conversion power banks, a single high-capacity 12V 334Ah lithium battery can be cleaner than wiring three or four smaller batteries together. It reduces parallel cabling, cuts down on connection points, simplifies installation, and keeps the internal cells managed by one advanced BMS. Always verify tray space, cable sizing, fusing, and charger settings before installation.
What size inverter can I run with the 12V 334Ah battery?
This battery has a 200A maximum continuous discharge rating and a 400A peak discharge rating for up to 3 seconds. At 12.8V nominal, 200A equals about 2,560W of DC output before inverter losses, so a single battery is best matched to 2,000W to 2,400W continuous 12V inverter loads. It can be used with a larger inverter only if the actual continuous draw stays within the battery, wiring, fuse, and inverter limits.
How do I monitor the charge level while traveling?
The battery includes built-in Bluetooth monitoring. By using the compatible Epoch Li-Ion app for iOS or Android, you can view important battery information such as state of charge, voltage, current, temperature, and battery status directly from your smartphone.
Can I charge this battery using my RV's or van's standard alternator?
To safely and efficiently charge this lithium battery from a vehicle alternator, use a properly sized DC-to-DC charger with a LiFePO4 charging profile. A DC-to-DC charger protects the alternator, controls current, and helps ensure the battery receives the correct lithium charging voltage.
Does this battery support cold-weather charging?
Yes. The Epoch 12V 334Ah Essential Series includes internal heating. Below 0°C / 32°F, the BMS pauses charging and incoming charge current from a connected LiFePO4 charger (at least 0.5A) powers the heating pads; the heater never uses stored battery energy. Charging resumes automatically once the battery reaches 5°C / 41°F. Epoch lists the charge temperature range as -20°C to 55°C / -4°F to 131°F with heating.
Can I use this battery to start my boat or RV engine?
No. This is a deep-cycle LiFePO4 battery designed for RV house power, marine house banks, van conversion energy storage, solar systems, inverters, lighting, pumps, electronics, and other prolonged 12V loads. For engine starting or cranking applications, use a cranking-rated battery or confirm compatibility directly with Epoch before installation.
Can I connect multiple 12V 334Ah batteries together?
Yes. Epoch lists this model for up to 4 batteries in series and up to 16 batteries in parallel when installed as matched batteries with compatible charging equipment, fusing, disconnects, and system-level protection. Large battery banks should be designed with properly sized cabling, busbars, overcurrent protection, and batteries of the same model, age, capacity, and state of charge.
Is the Epoch 12V 334Ah Essential Series battery waterproof?
This model has an IP54-rated enclosure, meaning it is dust-protected and splash-resistant for everyday RV, marine house-power, mobile, and outdoor use. It should not be submerged, pressure-washed, or installed where standing water can collect around the battery.
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Safety certifications & listings
Every mark below is a standard this battery has been tested against or a listing it carries. Here is what each one covers, in plain English.
IP54
Ingress protection
Dust-protected, and protected against splashing water from any direction. Under IEC 60529 the first digit rates solids and the second rates water.
- Protected from dust
- Splashes and light rain
- Sheltered outdoor use
IEC 60529, Degrees of protection provided by enclosures
Reviews
Recent reviews
Almost twice the capacity with almost half the weight!
Replaced my tired 2 agm 6v with the Epoch 334Ah into my class B LTV van. The agm's were SO heavy so I was very pleased with shedding almost half the weight and gaining almost half again more Battery capacity! We are leaving soon for an extended road trip and I am looking forward to enjoying the battery capacity!
Big power, small package
We have a Winnebago View with 2 new batteries in the battery box under the step Very nice!!!!
Great Single Battery
I haven't been out camping with my new 334Ah battery yet so I can only say that it's great just having to deal with one battery. This battery replaced two previous 100Ah batteries and was very easy to install into my factory Airstream battery box. The app seems to do a good job of providing data on the status of the battery including info on each cell…