True “Drop‑In" Replacement
- Standard 12V footprint, directly replaces a bank of 4*12V 100Ah lead‑acid batteries without rewiring
- 4.8kWh High Capacity – Runs an RV fridge (60W) for 80 hours, LED lights (50W) for 4 days, or a water pump intermittently for over a week
- 5000 Deep Cycles – One full cycle per day equals 13+ years – 10 times longer than lead‑acid
- 200A Continuous Current – Easily powers a 2000W inverter (peak 3000W), running microwave + coffee maker + TV simultaneously
- Lightweight – Only ~45kg, over 60% lighter than an equivalent lead‑acid bank, freeing up cargo capacity
- Up to 8 in Parallel – Scale to 8 units for 38.4kWh total – perfect for large RVs or home storage expansion
Full Specifications Table
| Specification |
Value |
| Electrical |
|
| Nominal Voltage |
12V (12.8V) |
| Nominal Capacity |
400Ah |
| Rated Energy |
4800Wh (4.8kWh) |
| Cell Type |
Prismatic LiFePO₄ (Grade A, 4S configuration) |
| Cycle Life |
≥5000 cycles @80% DoD (end of life 70% capacity) |
| Max. Continuous Charge Current |
100A |
| Max. Continuous Discharge Current |
200A |
| Peak Discharge Current |
400A (≤5s) |
| Charge Voltage Range |
14.2V – 14.6V (recommended 14.4V) |
| Float Voltage |
13.6V – 13.8V |
| Discharge Cut‑off Voltage |
10.8V ± 0.2V |
| BMS |
|
| BMS Type |
Built‑in smart BMS with passive balancing |
| Balancing Current |
120mA (passive) |
| Protection Features |
Over‑voltage, under‑voltage, over‑current, short‑circuit, over‑temperature, under‑temperature, reverse polarity protection |
| Communication (optional) |
Bluetooth (with APP), CAN, RS485 |
| Low‑temp Charge Protection |
Stops charge below 0°C, optional self‑heating available |
| General |
|
| Operating Temperature (Discharge) |
-20°C to 65°C |
| Operating Temperature (Charge) |
0°C to 55°C |
| Storage Temperature |
-10°C to 45°C |
| IP Rating |
IP54 (standard) |
| Dimension (L*W*H) |
Approx. 520*320*240 mm (depends on brand) |
| Weight |
Approx. 42‑48 kg |
| Terminal Type |
M8 x 2 (dual terminals for easy parallel connection) |
| Enclosure Material |
ABS + metal casing, flame‑retardant |
| Certifications |
CE, RoHS, UN38.3, MSDS |
Product Overview
The 12V 400Ah LiFePO₄ battery is the most straightforward upgrade for RVs, travel trailers and campers. Most RV factory electrical systems are based on a 12V platform. When users want to switch from lead‑acid to lithium, they often face common challenges such as mismatched dimensions, incompatible BMS communication, and complex charger parameter adjustments. This product is designed to solve these common challenges: standard size, 12.8V nominal voltage, and support for standard lead‑acid charging profiles (14.4V absorption). No need to replace your charger or inverter – truly “unplug the old battery, plug in the new one”. The 4.8kWh usable energy is 2‑3 times that of a lead‑acid bank of the same physical size (since lead‑acid only offers 50% safe DoD).
Why 12V remains the mainstream choice for RVs?
-
High adoption – Almost all small to medium RVs, campers, and trailers use 12V chassis electrical systems
-
Rich accessories – 12V fridges, pumps, lighting, 12V power outlets, USB chargers work without adapters
-
Low replacement cost – Upgrading to lithium doesn’t require also replacing the inverter, charger or solar controller
-
Good safety – 12V is extra‑low voltage, making DIY installation safer
-
Simple parallel expansion – Multiple units can be paralleled to linearly increase capacity without changing system voltage
The practical meaning of 400Ah large capacity
-
For an average RV, 400Ah supports 2‑3 days of off‑grid camping (including fridge, lights, water pump, TV and moderate microwave use)
-
With 400W‑800W solar panels, near‑infinite off‑grid range is achievable
-
More space‑efficient than two 200Ah batteries in parallel, and a single BMS makes the system simpler and more reliable
Application Scenarios
| Scenario |
Description |
| Travel Trailers & 5th Wheels |
Direct replacement for dual or quad 12V lead‑acid batteries – no electrical system modifications required |
| Campervans (Sprinter, Transit, Promaster) |
Fits under the passenger seat or in rear battery compartments; doubles running time for weekend trips |
| Boat / Marine (12V trolling motors) |
Powers trolling motors, fish finders, livewell pumps, lights – IP54 splash‑proof case |
| Off‑grid Tiny House |
Single unit provides 2‑3 days autonomy; parallel up to 8 units for full home backup |
| Solar Shed / Workshop |
Stores solar energy to run power tools, chargers, small refrigerator |
FAQ
Q: Can it directly replace the original lead-acid battery?
A: Yes, 12.8V is compatible with 12V systems, with adaptive size and consistent positive and negative poles, plug and play; it is recommended to check if the charger supports LiFePO4 (14.4V-14.6V).
Q: Does it support parallel expansion with multiple batteries?
A: Yes, it can be paralleled with up to 4 batteries, with a total capacity of 1600Ah, meeting the demand for large loads.
Q: Can it be used in low temperatures in winter?
A: The standard version can be charged above 0℃; the optional low-temperature heating version can be normally charged and discharged at -20℃, suitable for RVs in northern winter.
Q: How long is the service life and warranty period?
A: 3000+ cycles (70% DOD), usable for 8-10 years under normal use; 5-year warranty (free of charge for non-human damage).
Q: Is maintenance required?
A: Zero maintenance, no need for water replenishment, balancing or regular charging, low self-discharge rate, and slow power loss during long-term storage.
Q: Is it safe? Will it explode?
A: It adopts LiFePO4 (lithium iron phosphate), which has stable chemical properties, non-flammable and non-explosive; built-in BMS multiple protection and flame-retardant shell, safe and reliable for RV use.
