12V 200Ah Dual Purpose LiFePO4 Battery — Deep Cycle + Engine Starting
Product Overview
The 12V 200Ah dual purpose LiFePO4 battery delivers 2,560Wh for RV house loads with cranking support for engine starting. It bridges deep-cycle and starting applications for boats and RVs that need both from one unit: one battery bank runs the house loads through the night and still supports engine cranking, instead of a split deep-cycle/starting setup with two different battery types to size, wire and maintain.
As a China-based LiFePO4 battery supplier, LJY Energy supplies this model to RV and marine dealers, installers and distributors who want a single standardized 12V SKU that covers house power and starting assist. See also our 12V 400Ah deep-cycle model for larger house banks that do not need cranking support.
Typical Specifications
Values below are typical configurations. “Optional” items can be specified per order; “To be confirmed” items depend on the final configuration and order — contact us for the datasheet of the exact build you need.
| Parameter | Value | Status |
|---|---|---|
| Battery chemistry | LiFePO4 (lithium iron phosphate) | Typical |
| Nominal voltage | 12.8V | Typical |
| Rated capacity | 200Ah | Typical |
| Energy | 2,560Wh | Typical |
| Built-in BMS | 200A continuous discharge; over-charge / over-discharge / over-current / short-circuit / temperature protection | Typical |
| Starting support | Dual-purpose design supports engine cranking surges in addition to deep-cycle house loads | Typical — confirm cranking rating for your engine per order |
| Charge voltage (bulk/absorption) | 14.2–14.6V | Typical |
| Low-temperature charging protection | Charging cut-off below 0°C | Typical |
| Bluetooth / app monitoring | Cell voltages, SOC, temperature on mobile app | Optional |
| Series / parallel expansion | Parallel for larger house banks; series subject to configuration | Optional — subject to configuration |
| Enclosure protection | Sealed enclosure; ingress rating per final configuration | To be confirmed per order |
| Certifications | UN38.3 / MSDS / CE and others per target market | To be confirmed per order |
| Warranty terms | Subject to configuration and order agreement | To be confirmed |
| Dimensions & weight | Per final enclosure design | To be confirmed — datasheet on request |
| Lead time | Subject to order quantity and configuration | To be confirmed |
Why Dual Purpose
A dual-purpose battery changes how RV and boat owners plan their electrical system: one unit covers both the steady draw of house loads and the short surge of engine starting, which means fewer batteries, simpler wiring, and less weight than a split deep-cycle/starting setup. The flat LiFePO4 discharge curve also keeps electronics at a stable voltage from full to nearly empty, unlike the steady fade of lead-acid — and at a sensible 80% depth of discharge, the 200Ah rating returns about 160Ah of working capacity per cycle, roughly double the usable energy of a comparable lead-acid bank kept above 50%.
Charging & Compatibility
Typical charge profile: bulk/absorption at 14.2–14.6V, then termination — LiFePO4 needs no float stage and no equalization. Those figures are the 12V row of our charging voltage reference; see the complete charging guide for CC/CV operation.
- Shore-power and onboard chargers: select the lithium (LiFePO4) profile; on a custom profile, set absorption to 14.2–14.6V and disable equalization.
- Alternator charging: use a DC-DC charger with a lithium profile so the 200A-capable pack does not overload the alternator.
- Solar / MPPT: program the controller to the same 14.2–14.6V absorption setpoint.
- Engine compatibility: confirm the cranking requirement of your engine against the pack’s starting rating at the order stage — dual-purpose support is configuration-dependent.
Battery Lifespan
Cycle aging and calendar aging together determine real life. Typical reference for quality LiFePO4 cells: around 6,000 cycles at 80% depth of discharge (25°C, to 80% capacity retention) at cell level — pack results depend on BMS, thermal design and usage. Running at 80% DoD roughly doubles cycle life versus 100% DoD while sacrificing only 20% of per-cycle capacity. Our DoD vs cycle life guide explains the throughput economics.
Applications
- RV house power — 2,560Wh runs lights, water pump, vent fans, and a small inverter for laptops and kitchen gear through the night; the 200A BMS absorbs inverter startup surges without nuisance cutoffs.
- Engine starting assist — the dual-purpose design supports cranking current for gasoline engines, so smaller rigs can run a single battery bank for both house loads and starting instead of carrying a separate starter battery.
- Marine house and trolling — powers fishfinders, livewells, lighting, and trolling motors on smaller boats; the flat discharge curve keeps electronics at stable voltage from full to empty.
- Off-grid cabins and workshops — pairs with a solar charge controller for weekend cabins; a drop-in 12V replacement for lead-acid banks at a fraction of the weight and with far deeper usable capacity per cycle.
Where This Battery Is Used
This model is part of our Marine & Boat Battery Solutions and RV Battery Solutions — see those pages for system sizing, companion models and dealer guidance.
Wholesale, OEM & ODM
Volume pricing is available for RV and marine dealers, installers, and distributors. As a China-based LiFePO4 battery supplier, we support flexible customization: capacity and voltage variants, BMS configurations matched to the application (discharge ratings, low-temperature protection, communication options where inverter or display integration is required), housing and terminal choices, and private-label packaging.
Export coordination is handled per order — share the destination market and order profile, and we confirm the workable shipping method, documentation, and compliance path before you commit.
Related Technical Guides
- RV Lithium Battery System Design Guide — capacity sizing, wiring, charging, and safety for RV house banks
- How to Choose the Right BMS for LiFePO4 Batteries — what the 200A rating means and how to match BMS to load
- How to Verify a LiFePO4 Battery Supplier in China — due diligence checklist before placing an order
Frequently Asked Questions
Can one battery really handle both house loads and engine starting?
That is the point of the dual-purpose design: the 200A BMS and pack configuration support deep-cycle discharge for house loads plus short cranking surges. Confirm your engine’s cranking requirement against the exact build at the order stage.
How much usable energy do I get from 200Ah?
At 80% depth of discharge, about 160Ah — roughly 2,048Wh — per cycle, while keeping cycle life in the range LiFePO4 is known for.
Can I charge it from my alternator?
Yes, through a DC-DC charger with a lithium profile. Direct alternator connection without current limiting is not recommended for any large LiFePO4 bank.
Can I connect several units in parallel?
Parallel expansion for larger house banks is supported subject to configuration; series connection is configuration-dependent — confirm at order time.
Request a Quote
Tell us your application, order volume, and destination market for a tailored quotation: Request a Quote or reach us directly on WhatsApp.