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The 12.8V 314Ah LiFePO4 battery — 4.02kWh from a 4S1P pack — is the largest standard-format 12V lithium battery on the market. Built from the same 314Ah prismatic cells used in home storage systems, it brings 16kWh-class cell technology into a drop-in 12V replacement. This page covers the specification, cell options, BMS choices, and wholesale/OEM sourcing.
Specification at a Glance
| Parameter | Value |
|---|---|
| Nominal voltage | 12.8V (4S × 3.2V) |
| Rated capacity | 314Ah |
| Nominal energy | 4.02kWh (12.8V × 314Ah) |
| Cell configuration | 4S1P |
| Charge voltage | 14.6V typical |
| BMS options | 100A / 200A / 250A continuous |
| Features | Bluetooth, low-temp protection, IP65/IP67 options |
| Form factor | Group 8D-class / mini high-capacity case |
Market naming: this model is sold as “12V 314Ah”, “12V 314Ah Mini”, or a “4kWh LiFePO4 battery”. The technical voltage is 12.8V (4S); “12V” is the market name.
Cell Options
The 314Ah cell generation — EVE MB31, CATL, REPT, CALB, Hithium, Gotion — is the source of this model’s capacity. A 4S1P arrangement yields 4,019Wh in a single case, roughly triple the energy of a classic 12V 100Ah battery. LJY Energy verifies cell model, grade, and batch documentation per project; UN38.3 test summaries and MSDS are supplied. Specifications, pricing, MOQ, and lead times are confirmed per project.
Applications
- RV and camper vans: 4kWh in one battery reduces wiring complexity versus three or four 100Ah units in parallel.
- Marine and trolling: high reserve capacity for house loads and trolling motors. IP65/IP67 enclosures available.
- Off-grid cabins: a single 4kWh unit pairs with 1–2kW of solar and a 2–3kW inverter.
- Truck auxiliary power: for sleeper cabs and work vehicles.
Need the same cell generation at 24V or 48V? See the 25.6V 314Ah (8.0kWh) and 51.2V 314Ah (16.1kWh) pages. For cell-level sourcing, see LiFePO4 battery cells wholesale.
BMS and Customization Options
- High-current BMS: 200A–250A continuous options support inverter surge loads — match BMS current to your inverter.
- Bluetooth BMS: mobile app monitoring — see our BMS selection guide.
- Low-temperature protection: charging cut-off below 0°C; self-heating pads optional.
- Series/parallel: 12V units can be series-connected for 24V/36V/48V banks or paralleled for larger capacity.
- OEM branding: private-label cases and custom specification sheets.
Wholesale and OEM/ODM
12.8V 314Ah is positioned for distributors serving RV, marine, and off-grid channels. Available wholesale with matched Bluetooth BMS, custom enclosures, and project documentation. Contact us with your target BMS current rating, enclosure preference, and volume for a project quotation.
Cold-Weather Operation
- Low-temperature charging cut-off: the BMS blocks charging below 0°C automatically.
- Self-heating option: heating pads warm the cells to safe charging temperature — essential for winter RVing.
- Installation tips: mount inside the heated envelope when possible; insulate the battery compartment.
Shipping, Documentation & Project Terms
Lithium batteries ship as Class 9 dangerous goods with UN38.3 test summaries and MSDS. Specifications, pricing, MOQ, and lead times are confirmed per project.
Frequently Asked Questions
How much energy does a 12V 314Ah battery hold?
12.8V × 314Ah = 4,019Wh (4.02kWh) — roughly three times a standard 12V 100Ah battery (1.28kWh).
Can it replace my RV’s lead-acid batteries?
Yes. It is a drop-in 12V replacement with far deeper usable capacity and 3,000–6,000+ cycle life.
What BMS current do I need?
Match the BMS to your largest load. A 200A BMS supports roughly 2.5kW continuous at 12V; 250A supports ~3kW.
Can I connect multiple units in series or parallel?
Yes, within the BMS manufacturer’s limits. For native 24V or 48V systems, consider the 25.6V 314Ah or 51.2V 314Ah models instead.
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