Sapphire Energy
12V 300Ah Classic LiFePO4 Battery
12V 300Ah Classic LiFePO4 Battery
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A high-capacity 12.8V 300Ah Lithium (LiFePO₄) battery designed for reliable power in RVs, off-grid systems, marine installs, and backup energy storage. At roughly 1/3 the weight of comparable lead-acid batteries and equipped with built-in carry handles, this battery delivers serious energy capacity while remaining manageable to install.
With an IP65 weather-resistant enclosure, this battery performs well in demanding Canadian environments. It provides 150A continuous output (1920W), making it an ideal match for inverters up to approximately 2kW and capable of running essential loads for extended periods.
Expandable system design
This battery supports series connections up to 4S (12V, 24V, 36V, and 48V systems) and parallel connections up to 4P. Multiple batteries can be combined to build large energy storage systems up to approximately 61kWh of total capacity when properly configured.
- Large 3840Wh capacity for long runtime
- Lightweight LiFePO₄ design — only 24.6kg (54.3 lbs)
- IP65 rated enclosure suitable for outdoor and marine environments
- 150A continuous output supports high-power 12V loads
- Integrated BMS protections for safe operation
- Fishing & marine use
- Golf carts
- RV / camper
- Vans / buses
- Overland setups
- Diesel heaters
- CPAP (with or without an inverter)
- Off-grid living
- Solar & wind systems
- Emergency power backup
- Disaster preparedness
- 150A maximum discharge rate
- 3840Wh energy storage
- Automatic cell balancing for maximum energy density and lifespan
- High/low temperature protections for charging and discharging
- Over discharge protection
- Over charge protection
- Over current protection
- Short circuit protection
- A+ grade lithium cells
- 5000+ cycle lifespan
- 5 year limited warranty
- 10+ year expected service life
- Series connection: up to 4 batteries (max 48V / 51.2V)
- Parallel connection: up to 4 batteries
| Model | Classic 12V 300Ah |
| Chemistry | LiFePO₄ (Lithium Iron Phosphate) |
| Nominal Voltage | 12.8V |
| Charging Voltage | 14.2 Recommended (14.6V MAX) |
| Capacity | 300Ah |
| Energy | 3840Wh |
| Max Continuous Discharge | 150A |
| Max Charge Rate | 100A |
| Cycle Life | 5000+ cycles |
| Series Connections | Up to 4 (48V systems) |
| Parallel Connections | Up to 4 |
| BMS Protections | Over-charge, over-discharge, over-current, short-circuit, temperature |
| Enclosure Rating | IP65 |
| Terminal Type | M8 bolts (included) |
| Dimensions (L x W x H) |
15.25" × 7.7" × 10.75" |
| Weight | 24.6kg (54.3 lbs) |
| Warranty | 5 Year Limited Warranty |
This battery stores 3840Wh of energy. Real-world runtime depends on load size, inverter efficiency, and temperature. The examples below are approximate and assume typical usage.
| Load Example | Typical Power | Estimated Runtime |
| 12V fridge (average draw) | 40–60W avg | ~64–96 hours (2.5–4 days) |
| CPAP (no heated humidifier) | 30–60W | ~64–128 hours (many nights) |
| LED lights (camp/RV) | 10–30W | ~128–384 hours |
| Diesel heater (typical overnight use) | 10–40W avg | ~96–384 hours (multiple nights) |
| Starlink + router | 30–50W avg | ~60–120 hours (2.5–5 days) |
| Small inverter load (laptop + chargers) | 100W | ~38 hours |
Tip: plan around usable energy, and add solar charging to extend your runtime
For best longevity, many systems plan around ~80–90% usable capacity day-to-day. If you’re running an inverter, allow for inverter losses (commonly ~10–15% depending on load).
Can I run a 2000W inverter with this battery?
Yes — this battery supports 150A continuous output (~1920W at 12.8V), which is a good match for inverters up to about 2kW.
Very heavy continuous loads near the 150A limit may cause heating of the battery, so be sure to use large cables and allow suitable airflow around the installation.
Can I connect these batteries in series or parallel?
Yes. This model supports series connections up to 4 batteries (4S) for 48V systems and parallel connections up to 4 batteries (4P) for increased capacity/runtime. Use matched batteries (same model/age/charge level) and follow good wiring practices.
Does it have low-temperature charging protection?
Yes. The built-in BMS includes low-temperature charge protection to help prevent charging when battery temperature is too low, along with high-temperature protections and current protections.
Is this battery waterproof?
It is designed to be used outdoors, but not intended to be left outside without cover.
If your application includes permanent outdoor use, best practice is to install under cover, or inside an enclosure.
What size cable and fuse should I use?
Cable and fuse size depend on your inverter/load and total run length. For high-current inverter installs, keep cables short, use appropriately sized copper cable, and protect the circuit with a properly rated fuse. If you tell us your inverter size and cable length, we can recommend a safe setup.
How long will it last?
The battery is rated for 5000+ cycles and typically delivers 10+ years of service depending on depth of discharge, charging habits, temperature, and overall system design.
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very good customer service, since it is still winter i haven't installed or used the batteries.
Haven't used it for long periods yet. But, the quality seems great and the price was right.
It was a good deal. Haven't used it yet because I'm boondocking on a beach in Baja with my 300Ah Bluetooth lithium (and loving how that one works!)
I will use this one for a cooler/freezer application when I get home.
Quite happy with my battery puchase.Just setting it all up right now.Cant wait to try it out
One of the best moves I have made. 300 amp hours in the rv and it's working great. Now we can run for days. Great people to work with that gave us solid advice.
