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Epoch Batteries 12V 334Ah (4.28kWh) Essential Series LiFePO4 Battery - Off Grid Stores
by Epoch Batteries

Epoch Batteries 12V 334Ah (4.28kWh) Essential Series LiFePO4 Battery

SKU: 12334A-H
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$1,299.00 - $1,299.00
$1,299.00
$1,299.00 - $1,299.00
$1,299.00
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11-Year Limited Warranty

Off Grid Stores is an authorized retailer of Epoch Batteries products. Because of this, we pass on Epoch Batteries's manufacturer warranty to you.

Product Highlights
  • 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).
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Epoch Batteries 12V 334Ah (4.28kWh) Essential Series LiFePO4 Battery

Epoch Batteries 12V 334Ah (4.28kWh) Essential Series LiFePO4 Battery

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.

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.

Specifications:

Epoch Batteries 12V 334Ah (4.28kWh) Essential Series LiFePO4 Battery
ELECTRICAL
Nominal voltage 12.8 V
Capacity 334 Ah @ 0.2C
Stored energy 4.28 kWh (4,275 Wh)
Operating voltage 10.0–14.6 V
Max. charge voltage 14.6 V
Cycle life 4,000+ cycles
CURRENT RATINGS
Continuous discharge 200 A
Recommended discharge 167 A
Peak discharge 400 A for up to 3 s
Continuous charge 200 A
Recommended charge 167 A
CHARGE SETTINGS (LiFePO4)
Bulk / absorption 14.2–14.4 V
Absorption end Charge current ≤ C/20 (16.7 A) or 15 min,
whichever comes first
Float Disabled (preferred) or 13.3–13.6 V
Re-bulk 13.2 V
Temperature compensation 0 mV/°C (off)
Equalization Disabled
TEMPERATURE
Charge (with heating) −4°F to 131°F
Discharge −4°F to 140°F
Storage (recommended) 32°F to 95°F
Heating Pauses at 0°C, resumes at 5°C; minimum 0.5 A
MECHANICAL
Dimensions (L × W × H) 13.75 in × 7.63 in × 10.00 in
Length at handles 15.5 in
Height with bolts 10.5 in
Weight 60 lb (27.2 kg)
Group size BCI Group 31
Terminals M8 threaded terminal
Terminal torque 8–12 N·m (71–106 in-lb)
Enclosure IP54 per IEC 60529
SYSTEM AND COMPLIANCE
Bank limits 4 series · 16 parallel (max. 4S16P)
Monitoring Yes — Epoch Li-Ion app (iOS and Android)
Current sensing BMS-integrated shunt; 0.2 A accuracy on discharge
Cells (cell-level) UL 1642; IEC 62619
Label markings CE; RoHS; UN 38.3

Frequently Asked Questions

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.

Product Documents:

Epoch Batteries 12V 334Ah (4.28kWh) Essential Series LiFePO4 Battery User Manual

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Epoch Batteries 12V 334Ah (4.28kWh) Essential Series LiFePO4 Battery Specification Sheet

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