The Epoch 12V 334Ah Essential Series LiFePO4 battery (SKU 12334A-H) is a heated, Bluetooth-monitored lithium iron phosphate deep-cycle battery that stores 4.28 kWh of usable 12-volt energy in a single case. It is built for RV house power, marine house banks, van conversions, and off-grid solar storage where a large 12V bank is needed from one battery instead of several smaller units wired together. Sold by Lithium Battery Supply as a genuine Epoch product under an active reseller agreement, shipped from Epoch's U.S. warehouses and covered by Epoch's 6-year manufacturer warranty, this specific model.
One Epoch 12V 334Ah battery holds 334Ah of capacity and 4.28 kWh of stored energy, enough to replace three or four smaller 100Ah batteries with a single unit. Fewer batteries means fewer interconnects, fewer resistance points, one Battery Management System to manage the cells, and more usable space in an RV storage bay, a van build, or a boat compartment.
Key features
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334Ah / 4.28 kWh of LiFePO4 capacity in one 12.8V case
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200A continuous discharge and 200A continuous charge, with a 400A peak for 3 seconds for short surge loads within BMS limits
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Internal heating for safe charging in cold conditions, down to -20°C (-4°F) with heating active and an approved LiFePO4 charging source
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Bluetooth monitoring through the free Epoch Li-Ion app for iOS and Android
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Advanced smart BMS that protects against over-charge, over-discharge, over-current, short circuit, and high or low temperature
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Expandable up to 4 in series (for 24V, 36V, or 48V systems) and up to 16 in parallel, using matched batteries
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IP54 enclosure dust-protected and splash-resistant
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4,000+ cycle life, maintenance-free, with no watering or acid checks
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60 lb for the full 4.28 kWh, a large weight and space saving versus an equivalent lead-acid bank
Deep-cycle battery. This model powers house loads and auxiliary storage. It is not a cranking battery. For engine starting, use a cranking-rated battery, or see the Epoch 12V 172Ah Dual-Purpose model.
What it powers
The 200A continuous rating supports a properly designed 12V inverter system for appliances, galley loads, pumps, lighting, navigation electronics, tools, and off-grid equipment. At 12.8V nominal, 200A is roughly 2,560W of DC output before inverter losses, which pairs cleanly with a 2,000W to 2,400W continuous 12V inverter on a single battery. Larger inverters can be used only when the actual continuous draw stays inside the battery, wiring, fuse, and inverter limits, or when batteries are paralleled.
Specifications
| Brand |
Epoch Batteries |
| Model / SKU |
12334A-H |
| Series |
Essential Series |
| Chemistry |
LiFePO4 (lithium iron phosphate) |
| Cell configuration |
4S1P prismatic |
| Nominal voltage |
12.8V |
| Nominal capacity |
334Ah @ 0.2C |
| Stored energy |
4.28 kWh |
| Max continuous discharge |
200A |
| Max continuous charge |
200A |
| Peak discharge |
400A for 3 seconds |
| Operating voltage range |
10.0V – 14.6V |
| Max charge voltage |
14.6V |
| Series limit |
Up to 4 in series (24V / 36V / 48V systems) |
| Parallel limit |
Up to 16 in parallel |
| Bluetooth monitoring |
Yes, Epoch Li-Ion app (iOS and Android) |
| Internal heating |
Yes |
| Charge temperature range |
-20°C to 55°C / -4°F to 131°F (with heating) |
| 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) |
| Cycle life |
4,000+ cycles |
| IP rating |
IP54 dust-protected, splash-resistant |
| 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 |
| Warranty |
6-year limited manufacturer warranty |
Downloadable resources: data sheet, user manual, quick spec sheet, and safety data sheet are available from the resource links on this listing.
Charging & System Setup
Recommended charging settings
| Bulk / absorption voltage |
14.2V – 14.4V |
| Absorption end condition |
Stop when charge current ≤ C/20, or 15 minutes maximum |
| Float voltage |
Disabled preferred, or 13.3V – 13.6V |
| Re-bulk voltage |
13.2V |
| Temperature compensation |
0 mV/°C (none) |
| Equalization |
Disabled |
| BMS high-voltage cutoff |
14.6V |
| State-of-charge recalibration |
14.6V |
Use a lithium-compatible charger, inverter/charger, solar charge controller, converter, or DC-to-DC charger programmed to these LiFePO4 settings. Do not use a lead-acid equalization mode.
Charging from a vehicle alternator
To charge from an RV or van alternator, use a correctly sized DC-to-DC charger set to a LiFePO4 profile. A DC-to-DC charger protects the alternator, controls charge current, and delivers the correct lithium charging voltage.
Series and parallel expansion
Wire matched batteries in series for 24V, 36V, or 48V systems (up to 4) when the full bank uses compatible charging equipment and system-level protection. Parallel connection (up to 16) builds larger 12V banks. For any multi-battery bank, use batteries of the same model, age, capacity, and state of charge, with equal cable lengths, common busbars, branch fusing, and appropriate disconnects.
Working with Victron and similar equipment
The Essential Series charges by standard voltage-based LiFePO4 profiles and integrates with Victron and other lithium-capable chargers and inverters set to the recommended settings above. This model does not use closed-loop CANbus communication; that feature is found on other Epoch models.
Applications & Fitment
Designed for
- RV, camper, travel trailer, and motorhome house-power systems
- Van conversion and overland auxiliary power
- Marine house banks for electronics, pumps, lighting, and navigation
- Solar and off-grid storage for cabins, trailers, boats, and backup systems
- 12V inverter systems where continuous load stays within the 200A limit
- 24V, 36V, and 48V systems using matched batteries in series
Fitment planning
This is a large-format case, not a Group 31 footprint. Measure the compartment and cable path before ordering: allow 13.75 in of length at the base and 15.5 in at the handles, 7.63 in of width, and 10.0 in of height (10.5 in with terminal bolts). If you need a Group 31-sized battery, the Epoch 12V 300Ah is the Group 31 model.
Before installation, confirm tray dimensions, cable clearance, terminal compatibility, charger compatibility, fuse sizing, inverter requirements, and installation location. The IP54 enclosure is splash-resistant but must not be submerged or pressure-washed, and should not be installed where standing water can collect around it.
Warranty & Support
The Epoch 12V 334Ah Essential Series (SKU 12334A-H) is covered by Epoch's 6-year limited manufacturer warranty against defects in materials and workmanship. Register the battery with Epoch after purchase to activate coverage under Epoch's warranty terms.
Every Epoch battery sold by Lithium Battery Supply is a genuine Epoch product supplied under an active reseller agreement and shipped from Epoch's U.S. warehouses with full manufacturer warranty support. For technical questions on sizing, wiring, charging, or fitment, contact our team before installation.
Frequently Asked Questions
Is one 334Ah battery better than wiring three 100Ah batteries together?
For most RV, marine, and van power banks, a single 334Ah battery is a cleaner solution than wiring three or four smaller batteries. It reduces parallel cabling and connection points, simplifies the install, and keeps all the cells managed by one BMS. Confirm tray space, cable sizing, fusing, and charger settings before installation.
What size inverter can I run with this battery?
The battery has a 200A continuous discharge rating and a 400A peak for 3 seconds. At 12.8V nominal, 200A is about 2,560W of DC output before inverter losses, so a single battery pairs best with a 2,000W to 2,400W continuous 12V inverter. A larger inverter can be used only if the actual continuous draw stays within the battery, wiring, fuse, and inverter limits, or if you parallel additional batteries.
How do I monitor the charge level while traveling?
The battery has built-in Bluetooth. Using the free Epoch Li-Ion app for iOS or Android, you can view state of charge, voltage, current, temperature, and battery status from your phone.
Can I charge it from my RV or van alternator?
Yes, through a correctly sized DC-to-DC charger set to a LiFePO4 profile. A DC-to-DC charger protects the alternator, controls current, and supplies the correct lithium charging voltage. Do not connect a lithium battery directly to an alternator without one.
Does it support cold-weather charging?
Yes. The battery includes internal heating. When it is connected to an approved LiFePO4 charging source in cold conditions, the heating system warms the cells before normal charging continues. 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 battery for house power, marine house banks, van energy storage, solar, inverters, lighting, pumps, and electronics. For engine starting or cranking, use a cranking-rated battery, such as the Epoch 12V 172Ah Dual-Purpose model, or confirm compatibility with Epoch before installation.
Can I connect several 334Ah batteries together?
Yes. This model is rated for up to 4 in series (for 24V, 36V, or 48V systems) and up to 16 in parallel, using matched batteries with compatible charging equipment, fusing, disconnects, and system-level protection. Use batteries of the same model, age, capacity, and state of charge, with equal cable lengths and common busbars.
Is the battery waterproof?
The enclosure is IP54 rated, 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 it.
Will it fit a Group 31 battery compartment?
No. This is a large-format case measuring 13.75 in long at the base (15.5 in at the handles), 7.63 in wide, and 10.0 in high. If you need a Group 31 footprint, the Epoch 12V 300Ah is the Group 31 model. Always measure your compartment and cable path first.
How does the Essential Series compare to the Pro and Elite series?
The Essential Series is Epoch's value line. Compared with the Pro and Elite series it offers 4,000+ cycles, an IP54 enclosure, and standard voltage-based charging without closed-loop CANbus. It keeps the high capacity, internal heating, Bluetooth monitoring, and smart BMS. For a house bank in a dry compartment, it delivers strong usable capacity per dollar in the Epoch range.
What charger should I use?
Any lithium-compatible charger, inverter/charger, solar charge controller, converter, or DC-to-DC charger programmed to Epoch's recommended LiFePO4 settings: bulk/absorption 14.2V–14.4V, float disabled (or 13.3V–13.6V), equalization disabled, and no temperature compensation. A matched Epoch 12V 15A lithium charger is available as an add-on with this listing.
How long is the warranty?
This model (SKU 12334A-H) carries Epoch's 6-year limited manufacturer warranty against defects in materials and workmanship. Register the battery with Epoch after purchase to activate coverage under Epoch's warranty terms.
