Share This Article
A finished 12.8V 314Ah LiFePO4 battery — the 300Ah class — whose smart BMS does two things standard batteries cannot: it shows you every cell over Bluetooth, and it warms the cells automatically so charging can start below freezing.
Request a quotation for this battery: Start a BTH-12V314 inquiry · WhatsApp: +86 159 8945 0735
The Cold Problem This Battery Solves
LiFePO4 cells must not be charged below 0 °C — charging a frozen cell damages it permanently. A standard BMS handles this the blunt way: it simply blocks charging until the weather warms up. The battery is protected, but the bigger the pack, the bigger the loss: a 4kWh bank in an off-grid cabin or a winterised RV that refuses the morning’s solar charge is a system you plan your day around.
This battery takes the other route. Heating film is built into the pack, driven by the BMS. When a charger is connected and the cells are below the heating threshold, the BMS powers the heaters from the charger first, warms the cells into the safe charging window, and only then lets charging current flow — automatically, with the low-temperature charge cut-off still standing guard behind it. You see the whole sequence in the app: cell temperatures rising, heating on, then charging under way.
The second half of the design is visibility. The smart BMS (Jiabaida/JBD platform — the same board family we supply as standalone smart BMS boards) carries Bluetooth monitoring as standard: individual cell voltages, pack voltage and current, state of charge, both temperature sensors, cycle count and protection events, readable on a phone at the battery — no shunt, no display panel, no guessing which cell is drifting. One 314Ah pack with one honest cell-level view replaces the three paralleled 100Ah packs whose individual states no single screen ever showed you.
Reference Standard Configuration — 12.8V 314Ah
| Item | Reference configuration | Basis |
|---|---|---|
| Nominal voltage / capacity | 12.8V / 314Ah — 4,019Wh; 4S prismatic LiFePO4 | Fixed by the model |
| Smart BMS | JBD-platform smart BMS, 200A continuous class | Board model confirmed per order |
| Bluetooth monitoring | App readout: per-cell voltage, pack voltage/current, SOC, temperatures, cycles, protection log | Standard fit on this series |
| Heating | Integrated heating film; auto-starts on charge below the set threshold (typ. 0 °C), powered by the charger; heating and charging status visible in the app | Standard fit on this series; thresholds set per order / in app |
| Low-temperature protection | Charge cut-off below the safe cell temperature remains active independent of heating | Standard BMS protection |
| Standard protections | Over-charge, over-discharge, over-current, short-circuit, over/under-temperature, cell balancing | Standard BMS protection set |
| Case | Sealed ABS battery case (steel case as an option) | Dimensions confirmed per order against the case in your configuration |
| Terminals | Standard top terminals, P+ / P− | Terminal form confirmed per order |
Read the Basis column the way our buyers do: the Bluetooth and heating functions define this series and are standard on every model in it; dimensions, terminal forms and board current class are confirmed in the order specification, because case moulds and board options in this class genuinely vary by programme. Final specifications are those in your order confirmation — not this page.
The Series — Configuration Options
| Model | Nominal | Energy | BMS class | Inquiry code |
|---|---|---|---|---|
| 12.8V 50Ah with Bluetooth & Heating | 12.8V 50Ah | 640Wh | 50A (100A option) | BTH-12V50 |
| 12.8V 100Ah with Bluetooth & Heating | 12.8V 100Ah | 1,280Wh | 100A (150A option) | BTH-12V100 |
| 12.8V 200Ah with Bluetooth & Heating | 12.8V 200Ah | 2,560Wh | 200A class | BTH-12V200 |
| 12.8V 314Ah with Bluetooth & Heating (this page) | 12.8V 314Ah | 4,019Wh | 200A class | BTH-12V314 |
| 12.8V 460Ah with Bluetooth & Heating | 12.8V 460Ah | 5,888Wh | 200A class | BTH-12V460 |
| 25.6V 100Ah with Bluetooth & Heating | 25.6V 100Ah | 2,560Wh | 100A class | BTH-24V100 |
| 25.6V 125Ah with Bluetooth & Heating | 25.6V 125Ah | 3,200Wh | 100A class | BTH-24V125 |
| 38.4V 100Ah with Bluetooth & Heating | 38.4V 100Ah | 3,840Wh | 100A class | BTH-36V100 |
| 51.2V 100Ah with Bluetooth & Heating | 51.2V 100Ah | 5,120Wh | 100A class | BTH-48V100 |
Every model in the table is the same product idea at a different size: Grade A prismatic cells, the JBD-platform smart BMS with Bluetooth, integrated heating, and the full protection set. The 314Ah sits in the size class the market also labels 300Ah — it is built on 314Ah cells, and its nameplate says so rather than rounding down. Case format (sealed ABS or steel), terminal form, and OEM appearance (case colour, your logo and labels, rating plate, manual, packaging) are configuration options on all nine models.
What the Bluetooth Link Actually Tells You
- Per-cell voltages — the earliest warning of imbalance; you see the drifting cell months before it becomes a capacity complaint
- Live charge and discharge current, pack voltage, SOC — what a shunt monitor would tell you, without fitting one
- Both temperature sensors and heating state — whether the pack is heating, at what temperature charging started, and what the coldest cell reads
- Cycle count and protection events — the battery’s own service history, which is what warranty conversations and fleet maintenance actually run on
- Protection parameters — thresholds readable in the app; adjustable items are set per your order specification
For installers and distributors, this is the support feature as much as a user feature: a customer reporting “the battery stopped charging” can read you the protection log and cell temperatures from their phone, and a cold morning with heating under way looks exactly like what it is — not like a fault.
How the Heating Cycle Runs
- Charger connects, cells are cold. The BMS reads the temperature sensors below the heating threshold and holds charging current off.
- Heating starts, powered by the charger. The heating film warms the cell block evenly; the app shows temperatures climbing. No energy is taken from the pack itself in the standard configuration.
- Charging begins inside the safe window. Once cells reach the set temperature, the BMS opens charging and the heaters cycle off; the low-temperature cut-off stays armed the whole time, so a heater fault never becomes a frozen charge.
Heating energy comes out of the charger’s output, not your stored capacity — on a solar morning the first minutes of weak winter sun go to warming, and the day’s charge follows. Warming a 314Ah block takes longer than warming a 100Ah one; the app temperature trace tells you exactly where it stands. If your application needs the pack warmed with no charger present, tell us the duty cycle in the inquiry; that is a project configuration, quoted as such, not a silent assumption.
Where This Battery Earns Its Keep
- Off-grid homes and cabins — 4,019Wh in one unit for serious winter solar storage; see our off-grid energy storage page
- Large RVs and expedition vehicles — one pack under the bed instead of three in parallel, charging on frosty mornings; see our RV battery page
- Cold-region solar and backup — anywhere a standard bank spends winter refusing charge; the wider range is on the 12V LiFePO4 battery series page
- Marine house banks on larger boats — winter-in-water boats with real house loads; see our marine battery page
If your climate never goes below freezing, buy the standard battery instead and skip the heating hardware. If 4kWh is more than the job needs, the 12.8V 100Ah Bluetooth & heating battery is this design at a third of the capacity. If you build packs yourself, the same Bluetooth-and-heating board platform is available as a standalone smart BMS board, and the 314Ah cell class is covered in our DIY battery kits.
OEM / ODM: Your Brand, Your Specification
This series is supplied for distributors, outfitters and private-label programmes: case colour, logo and rating labels, manuals and packaging carry your brand; configuration covers BMS current class, case format and terminal form across the nine models. Our role is coordination — requirements are confirmed in a written specification, matched against manufacturing partners’ production, with the agreed checkpoints and export documents handled on our side. The specification in your order document is what binds the shipment. Start from our OEM & ODM coordination page or the OEM / ODM RFQ checklist.
What to Send Us for a Quotation
- Model — 12.8V 314Ah, or another model from the series table
- Your coldest charging condition — the lowest temperature at which the battery must accept charge; this confirms the heating configuration
- Largest continuous load and inverter size — so the BMS current class is sized to the real discharge profile
- Charger or solar controller you will pair it with — heating runs from the charger, so its output matters
- Quantity and destination — samples for evaluation, or your expected regular volume, plus the destination port
Frequently Asked Questions
Is this the same as a “300Ah” battery?
It is the same size class. Brands label this class 300, 314, 320 or 334Ah depending on the cells inside; ours is built on 314Ah cells and named for them. When you compare offers, compare the watt-hours and the cell grade in the written specification — 4,019Wh here — not the rounded marketing number.
Does the heating also warm the battery for discharging?
It does not need to: LiFePO4 discharges safely well below 0 °C (with reduced capacity); it is charging that cold forbids. The heating system exists to bring cells into the safe charging window when a charger is connected. If your duty cycle needs warming with no charger present, raise it in the inquiry — that is a project configuration.
What happens if the heater fails on a frozen morning?
The same thing that happens with a standard battery: the BMS low-temperature cut-off keeps charging blocked and the cells stay safe. Heating is layered on top of the protection, never instead of it — a heater fault costs you a charge, never a cell.
Will Bluetooth drain the battery in storage?
The BMS standby draw, Bluetooth included, is small against a 314Ah pack, but it is not zero. For storage measured in months, charge the battery to its storage level and follow the storage instructions in the quotation documents; for a winterised installation, check the app state once in a while — which is rather the point of having it.
Can I parallel two of these for ~8kWh?
Parallel configurations are confirmed per project against the BMS class and your cabling plan — tell us the system design in the inquiry and the quotation will state the supported configuration in writing rather than leaving it to a generic yes.
The Bluetooth & Heating Series
This page is the 314Ah model of LJY Energy’s Bluetooth & heating LiFePO4 series — finished batteries whose smart BMS combines per-cell Bluetooth monitoring with automatic low-temperature heating for charging: 12.8V 100Ah, 12.8V 200Ah, 12.8V 314Ah (this page), 12.8V 460Ah, 25.6V 100Ah, 25.6V 125Ah and 51.2V 100Ah, all confirmed per order specification. The full product range is on Products.
Request a quotation for this battery: Start a BTH-12V314 inquiry · WhatsApp: +86 159 8945 0735
Share This Article