SFK-275SE 12v 275 AH 3.6 kWh Smart Active Balance Endurance Battery Lithium Iron Phosphate

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

Max Discharge (Amps)

Battery Capacity (AH)

Battery Capacity (AH)



Cycle Life

Cycle Life

6000 Cycles at 80% D.O.D.
Data Port

Data Port

RS485 Data Port
Heating System

Heating System

Low Temp Protection
Battery Upgrades

I/O Switch:
I/O Switch
Free Upgrade: GEN2B Switch is now available as free upgrade for the 275SE. Turn Bluetooth on/off, full Active Balancer control, and external temperature monitoring.
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.
length is about 9 feet.
Battery Accessories

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
Add all weather service with our heated battery jacket that will keep your battery warm in even the coldest environments. Also offers superior protection against dust, debris, and water splashes.
Battery Cable Kit:
Battery Cable Kit
Great way to add a quick disconnect to your battery, rated for up to 175A.
Our Regular Price: $1,250.00 (22% OFF)
On Sale: $975.00
Configuration Price: $975.00

Sun Fun Kits presents: The SFK-275SE Smart Endurance Active Balancing Battery! Yes the lightest and most energy dense LFP battery on the market that also features  a 150 amp bms, support for 4s series (48v) connections, active balancing and balancing control, and an easy to use smart app that allows you to monitor a single or up to 4 batteries simultaneously!


The GEN 2B  switch gives users greater control over their battery as now the Bluetooth system can be turned on or off with a touch of the button giving increased security. Users are now able to fully manage the built-in active balancer as it can be set to run in normal mode, 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 passive BMS balancing to manage the cells. Finally we have added a button to view internal battery temperature via a button press (this is represented using different colors to indicate battery temperature).


Built with certified ESS (Energy Storage System) cells with complete manufacturer test reports and certified to UL1973 standards, you will love the reliability of ESS cells that will stay in balance, have a long service life, and also have the power to output up to 1800 watts of  power. ESS cells have  an increased   cycle life of 6000 cycles at 80% depth of discharge, or up to 8000 cycles at 50% depth of discharge compared to automotive grade cells.


The SFK-275SE 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-275SE battery may be used anywhere where 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.

  • 3.6 kiloWatt hours of reliable lithium power, replaces 5 lead acid / agm batteries (100ah) and is designed to be discharged to 100% of available capacity without harm to the battery.
  • Up to 1.8 kilowatts of peak power, and 1250 watts of continuous power.
  • Expected cycle life of 6000 cycles at 80% DOD, and up to 8000 cycles at 50% DOD, 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).
  • Smart phone/device compatible with Bluetooth monitoring/configurable app. Available for IOS/Android.
  • Bluetooth functionality can be disabled for extra security
  • Onboard temperature monitoring via the GEN 2 B switch
  • 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.
  • Active Balancing System that allows up to 5 amps of cell balancing, can be configured to always run, or turn on only when the battery is near full, or disabled (use bms passive balancing).
  • Optional RS-485 data port to allow for integration with smart/closed loop systems such as the Victron Cerbo GX.
  • 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 3.5 KW continuous.
  • Serviceable and upgradeable allowing users to replace BMS, cells, wiring, battery wiring and more.
  • 7 Year USA Warranty (when installed through the certified Sun Fun Kits dealer network), 5 year USA warranty for direct purchases or webstores.

An excellent budget battery for those do not require built in heating. Built with the same certified cells as the 275EX, the SFK-275SE includes options such as the GEN2B Switch, RS-485 data port, Victron Communication, and is also the lightest battery we sell (under 56 lbs).

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 1973 (Cells)
Cycle Life 6000 Cycles at 80% D.O.D.
Heating System Low Temp Protection
Continuous Discharge (Watts) 1250
Cells 4
Battery Capacity (AH) 275
Voltage 12.8 , 13.0 , 13.6
Watt Hour Capacity (kWh) 3.6
Max Discharge (Amps) 150
Max Charge (Amps) 100
Construction Material ABS, Aluminum, PCB
Battery Weight (Lbs) 55.5
Balance Capacity (AH) 5200
Terminal Studs M8
Physical Specs
Item Weight 55.65
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 7 Year Authorized Dealer Installed Warranty , 5 Year 36/60 Month Warranty
Customer Review