PowerTex Batteries BCI Group 51R Lithium LiFePO4 Automotive Battery

  • Sale
  • $449.99
  • Regular price $649.99

  • MORE POWER¬†- The rated voltage of our batteries is about 0.8V higher than a lead-acid battery, meaning the battery has more discharge power. As a result, it can improve the combustion¬†efficiency of the fuel in the engine cylinder. So when using this battery you may feel the car start faster, has lower fuel consumption, lighter throttle,¬†more responsive engine and more power!
  • LIGHTWEIGHT¬†‚Äď Powertex‚Äôs LiFePO4¬†BCI Group 51R battery weighs in at 10.6 lbs compared to the standard lead acid equivalent which weighs a whopping 27.8 lbs.¬†
  • BATTERY MANAGEMENT SYSTEM - PowerTex LiFePO4 Lithium Iron Phosphate Batteries come standard with a built-in BMS (Battery Management System) that protects it from the most common causes of battery failure.
  • GRADE A CELLS¬†- Powertex LiFePO4 Lithium Iron Phosphate car batteries provide the highest level of quality and reliability. Don't be fooled by the competition, our cells are UL certified. Our batteries UN38.3 & RoHs certified.¬†
  • LONGEVITY¬†‚Äď Powertex LiFePO4 automotive batteries provide¬†more than 2,000 cycles at 80% DOD (depth of discharge). This is compared to a lead acid battery that only offers 200 ~ 500 cycles. As a result, our lithium iron phosphate batteries have a lifespan of about 5 to 10 years.
  • WARRANTY - We stand by and believe in our products and think you should too! That's why we test all batteries before shipping and offer a 2 Year warranty.
  • CHARGING - A LiFePO4 charger is highly recommended since SLA chargers might not reach the optimal 14.4V-15V LiFePO4 charging voltage. This might¬†result in the¬†LFP battery never reaching it's full charge and thus lowering the performance.

Battery Features

  • Super high-rate Lithium Iron Phosphate battery technology, instant discharge rate exceeding 20C.
  • Superior performance at low temperatures to similar products on the market, more suitable for low temperature environments.
  • High energy density,¬†a third of the weight of a lead-acid battery.
  • Low self-discharge rate, can be used after one year of storage¬† at normal temperatures.
  • With three times the service life of SLA batteries, the average battery life is 6-10 years.
  • Built-in charge balance guard plate to ensure all cells within the battery are properly balanced inside the battery at all times.
  • Operates in all positions, no need to worry about leaking.
  • No corrosive liquid, free of toxic heavy metals, green and environmentally friendly.
  • Cylindrical core and energy storage spot welding technology brings good safety.


Model PTLG51R
Dimensions LxWxH 9.4 x 5.1 x 8.7 inches
Terminal Standard (STD)
Weight 10.6 lbs
Voltage 12.8 Volts
Capacity 36 Amp Hours
Power 461 Watt Hours
Cranking Amps (CA) 720 CA
Cold Cranking Amps (CCA)
360 CCA
Charging Voltage
14.4V ~ 14.8V
Charging Current
18A ~ 72A
LiFePO4 Cell Model 32700
Number of LiFePO4 Cells 24
Internal Resistance ‚ȧ6.2mő©
Charging & Discharging Temperature
14‚ĄČ - 131‚ĄČ
Storage¬†Temperature -4 ‚ĄČ - 104‚ĄČ
Cycle life @ 80% DOD ‚Č• 2,000 cycles
Warranty 2 Years
Residual Capacity After Storage at 77 ¬†‚ĄČ¬† 1 Month
3 Months
6 Months

Customer Reviews

Based on 16 reviews
Bradley Smith
So far, so goof

I have a 2020 Honda fit LX that I upgraded the stock 151 battery to a 51R Power Tex lithium battery. This was a nice upgrade I Purchased a 2020 Honda HR lower battery tray from eBay. It was a complete drop in upgrade. The battery tray fit perfect with no modification necessary. The stock battery, which was about 1/3 smaller in overall length than the 51 hour, but the same width. The original equipment battery weighed over 18 pounds and the 51 hour weighed 8 1/2 pounds.. I have great peace of mind, knowing I have both the lithium power and a third more power than the original battery. I would totally recommend this upgrade to any owner of a 2015 to 2020 Honda fit any model. Customer Service was always available and answered my questions, this was a perfect outcome. I look forward to many years of use from this battery, and I will not hesitate in the future to recommend or use their product. Sincerely, Bradley Smith, Tulsa, Oklahoma.

Direct Signature Shipping?

The battery is awesome so far (very light!). Time will tell how it lasts. Direct signature shipping was a pain in the butt. It took three days to work out how to be home at the time of the delivery.

Lance Hamilton
Works as it should

Recently injured my back and couldnt lift the old lead acid battery so this was much easier to put in

Great experience

The people at powertex really are 5 stars, I knew nothing about lithium batteries but they were able to explain everything to me with great patience.

Calvin Harris
Would buy again

Great service! No hassle whatsoever with powertex support, they helped me find the right battery.