SFK-300HP 12v 300AH 4.0 kWh High Power Dual Heating Lithium Iron Phosphate Battery

Sun Fun Kits
Return Policy:
30 Day Returnable ( Restocking Fee : $0.00 )
Shipping Availability:
2 to 3 Days
Stock Status:
Out of Stock
Max Discharge (Amps)

Max Discharge (Amps)

Battery Capacity (AH)

Battery Capacity (AH)



Cycle Life

Cycle Life

3000 at 80% D.O.D.
Data Port

Data Port

RS485 Data Port
Heating System

Heating System

Auto & Manual
Battery Upgrades

I/O Switch:
I/O Switch
Free Upgrade: GEN2 Heat Switch is now available as free upgrade for the 300HP. Turn Bluetooth on/off, Full Active Balancer Control, and new simplified Heating.
Data Port:
Data Port
This RS485 (half duplex) connection will allow you to get BMS data from your battery. Up to 16 batteries can be connected via the upcoming SFK HUB.
SFK Data Cable:
SFK Data Cable
This cable is required for communication to to inverters, computers, and devices like the Victron Cerbo GX/S. The cable requires the RS485 port on the battery.
The length is about 9 feet.
Battery Accessories

Battery Cable Kit:
Battery Cable Kit
Great way to add a quick disconnect to your battery, rated for up to 175A.
Lithium Charger:
Lithium Charger
The SFK-PS-400 is a 30 amp / 400 watt charger and can charge your battery from 0% to 100% in about 10 hours (overnight).
Add Jacket:
Add Jacket
Our Regular Price: $1,750.00 (29% OFF)
On Sale: $1,235.00
Configuration Price: $1,235.00

Sun Fun Kits presents: The SFK-300HP Self heated lithium iron phosphate battery! Yes the lightest and most energy dense LFP battery on the market that also features built in heating elements for low temperature charging, a 200A bms, support for 4s series (48v) connections, and an easy to use smart app that allows you to monitor a single or up to 4 batteries simultaneously!


The GEN 2 switch gives users greater control over their battery kit as now the Bluetooth system can be turned on or off with a touch of the button giving increased security. Users also are now able to fully manage the build in active balancer, as it can be set to run in normal mode, or in hi-mode (here the active balancer will only turn on when the battery is over 13.3 volts), or it can be turned off entirely and the battery will use the built in passive BMS balancer to manage the cells. Finally we have simplified the heating system as now users can turn heating on or off with one button; the system will indicate a white LED letting users the heating system is active and in standby, but will turn to a red LED to let users know that the system is active and is providing heating to warm up the cells. Please note, the SFK battery kits are the only kits on the market that support both standby heating as well as automatic low temperature heating, many smart batteries only support 1 mode.


Built with certified automotive grade cells with complete manufacturer test reports, you will love the reliability of EV class cells that will stay in balance, hold voltage during heavy loads, and also have the power to output up to 2400 watts to power up even the most demanding of devices.


The SFK-300HP is hand built by Sun Fun Kits technicians in Baton Rouge, Louisiana and is built to order. This battery uses components from the United Sates, China and India and has gone through a complete balance, capacity and load test to ensure it is built to industry standards. Your battery comes ready to use and we recommend you review the user guide on how to get the optimum performance and longevity of your unit.


The SFK-300HP battery may be used anywhere typical deep cycle lead acid/agm/flooded batteries are used and does not require special charging equipment as they have built in circuitry that ensures proper charging and discharging.

  • 4.0 kiloWatt hours of reliable lithium power, replaces up to 6 lead acid / agm batteries (100ah) and is designed to be discharged to 100% of available capacity without harm to the battery.
  • Up to 2.4 kilowatts of peak power, and 1500 watts of continuous power.
  • GEN 2 I/O Switch allows bluetooth to be turned on/off, full active balancer control, and a simplified heating control system.
  • Expected cycle life of 2000-3000 cycles at 80% DOD, and up to 5000 cycles at 50% DOD, 10-15 year usage life.
  • Fully compatible with existing 12v infrastructure including standard 12v lead acid/agm battery chargers, trickle chargers and high voltage DC systems up to 48v (when linked in series with 4 batteries).
  • Built-in cell heaters to allow for low temperature charging, temperature to activate heaters can be set inside the app.
  • Smart phone/device compatible with Bluetooth monitoring/configurable app. Available for IOS/Android.
  • Can be linked in series up to 48v (4 batteries in series) as well as up to 4 in parallel with a combined output of 3.0 KW continuous.
  • Automatic low/high temperature and low/high voltage cut-off to stop battery damage from occurring.
  • Automatic short circuit prevention as well as over charge and over discharge prevention.

Best Seller! The SFK-300HP now in its 2nd generation with new features such as the GEN2 Switch, RS-485 data port, Victron Communication, and dual heating modes (automatic & manual) make it the ultimate battery!

Recommended Uses

  • Use in RVs as a 12-48 volt power source, or as part of an inverter bank to provide standby power
  • Use in solar panel installs as a power source for storing power
  • Use in troller motor applications for boats (requires ensuring that the battery is isolated and protected from water intrusion)
  • Use in Golf Carts or other small electric vehicles that have amperage governors (care must be taken to ensure that the batters are protected from water intrusion)
  • As a DC power source for power supplies and other items needing DC power
  • Use in DC to AC inverters where standby / backup power is needed such as data centers, or residential power sources.

Shipping Availability 2 to 3 Days
GTIN 00850036385073
Manufacturer Sun Fun Kits
Battery Specs
Chemistry LifePo4 (lithium Iron Phosphate)
Data Port RS485 Data Port
Certification Standard UL 1642 , UL 2580 (Cells)
Heating System Auto & Manual
Cycle Life 3000 at 80% D.O.D.
Continuous Discharge (Watts) 1500
Cells 4
Battery Capacity (AH) 300
Voltage 12.8 , 13.0 , 13.6
Watt Hour Capacity (kWh) 4.0
Max Discharge (Amps) 200
Max Charge (Amps) 80 , 160
Construction Material ABS, Aluminum, PCB
Battery Weight (Lbs) 60 , 57.8
Balance Capacity (AH) 5200
Terminal Studs M8
Physical Specs
Item Weight 57.7
Height 11.6 Inch , 290 MM , 10.6 Inch Without Terminal Screws
Width 180 MM , 7.5 Inch
Length 345 MM , 13.6 Inch , 14.6 Inch / 371 MM Including handles
General Information
Country of Origin USA , China
Service and Support Serviced, Repairs in USA
Warranty 8 Year 60/96 Month Warranty
Customer Review