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ExpertPower 12V 20Ah Lithium LiFePO4 Deep Cycle Rechargeable Battery | 2500-7000 Life Cycles & 10-Year lifetime | Built-in BMS | Perfect for RV, Solar, Marine, Overland, Off-Grid Applications

4.3 out of 5 stars 832

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20 AH
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About this item

  • LiFePO4: ExpertPower’s newest line of batteries – The No.1 Sealed Lead Acid Battery Seller on Amazon.
  • Longer Service Life: Our LiFePO4 battery provides 2500 - 7000 cycles & a 10 years lifetime compared to 200 - 500 cycles & a 3 years lifetime in typical Lead Acid chemistry.
  • Efficient Power: Our LiFePO4 battery’s flat discharge curve holds above 12V for up to 90% of its capacity usage providing astronomical boosts in run-time compared to only 50% in Lead Acid.
  • Impeccably Lightweight: Our LiFePO4 battery is only a 1/3 of the weight of Lead Acid which makes it the disputable choice for RVs, Marine and Off-Grid Applications when towing or mobility is in the consideration.
  • Complete Protection: The lithium battery’s unique built-in Battery Management System (BMS) protects it from overcharge, deep discharge, overloading, overheating and short circuit, and excessive low self-discharge rate ensuring up to 1 year maintenance-free storage.

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Product description

The battery's proprietary lithium-iron phosphate chemistry takes the hassle out of maintaining and utilizing the power you need. Batteries are meant to be used when you need them and if you need them all the time then lead acid becomes too unreliable and exhausting to keep track of. The lithium chemistry of the battery cuts the weight of the traditional lead acid battery to less than half while providing a massive boost to performance and capacity so you won't miss a single second of runtime. Designed for more than just storing power easily, they're here for you to provide long-lasting peace of mind with their immense durability making it easy to use them in your home, at your job, or for your outdoor needs where trust, safety, and the environment matter most. ExpertPower's lithium battery is the next step to a cleaner, stronger, and safer power solution.


  • Nominal Voltage: 12.8v

  • Charging Voltage: 14.4±0.2v

  • Rated Capacity : 20Ah (0.2C, 25°C)

  • Terminal Type: F13/M5

  • Dimensions (L x W x H): 7.1 x 3 x 6.6 (H + Terminal: 6.8) Inch

  • Weight: 5.8lbs

  • Max. Continue Discharge Current: 30A

  • Max. Permanent Discharge Current: 80A 10Sec.

  • Max. Continue Charge Current: 10A

  • Life Cycles: 2500 with 100% DOD; 3600 with 80% DOD; 7000 with 50% DOD

  • Operating Temperature:

    Discharging: -4°F to 140°F

    Charging: 32°F to 140°F

    • Storage Duration:12 months at 77°F
    • 1 Year Hassle-Free Warranty

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ExpertPower

ExpertPower 12V 20Ah Lithium LiFePO4 Deep Cycle Rechargeable Battery | 2500-7000 Life Cycles & 10-Year lifetime | Built-in BMS | Perfect for RV, Solar, Marine, Overland, Off-Grid Applications


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Customer reviews

4.3 out of 5 stars
4.3 out of 5
832 global ratings

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JennE
5.0 out of 5 stars Best small battery ever!
Reviewed in the United States on 6 February 2024
Verified Purchase
Joseph D.
5.0 out of 5 stars LiFePO4 is a much needed upgrade compared to Lead Acid Batteries
Reviewed in the United States on 29 June 2021
Verified Purchase
Fidex
5.0 out of 5 stars 100% Durable y Eficaz
Reviewed in Mexico on 1 June 2021
Verified Purchase
2 people found this helpful
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Stan
5.0 out of 5 stars Exactly Same Size As 12 Volt 20 Amp Lead Acid Battery
Reviewed in the United States on 21 August 2020
Size Name: 20 AHVerified Purchase
6 people found this helpful
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StephenH
5.0 out of 5 stars Saves weight, saves space, longer life, what's not to like?
Reviewed in the United States on 19 January 2020
Verified Purchase
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StephenH
5.0 out of 5 stars Saves weight, saves space, longer life, what's not to like?
Reviewed in the United States on 19 January 2020
Update 4/29/2021
The battery is performing well. We made a trip to Florida to visit my parents which included one night without hookups. The DC to DC charger works great and the battery is not having any issues with performance. I was thinking of adding another but the reply I got was not to do so if the age is greater than 6 months. I guess I need to save for the 200AH model.

Update: 6/22/2020
We still have only had short opportunities to use this battery since our trip to Alaska has been pushed back to next year. That was one of the main reasons for purchasing and installing this battery. However, I am still very happy with it. I did have to make some changes though.

First, I realized that the tow vehicle could not charge the battery when I noticed that it was lower after towing than before. Two days of towing took it down to about 70%. This prompted me to purchase a Renogy 20A DC to DC charger and to install a battery isolator relay in the Frontier we use along with a dedicated circuit to power it. Now I can be confident of properly charging the battery while towing. Please be aware of this if you purchase one of these or a similar LiFePO4 battery as the 12V circuit running through the trailer connector cable is not suited for proper charging. It would probably be okay for short hauls, but not multi-day trips, especially of one is planning on off-grid camping.

I also purchased a 100W Renogy solar suitcase to use if we are off-grid. Between the generator, the tow vehicle, and solar, we have three ways to charge the battery so I think we will be okay for off-grid camping.

Original review:
I purchased this battery to take the place of two 6V GC2 batteries I have used since December, 2015 in our camping trailer. By specifications, the GC2 batteries have more power, but since they are Lead-Acid, the best practice is to only discharge them no lower than 50% state of charge. The 215AH becomes only 107.5AH. To get that, it meant carrying about 120 lbs on the tongue of the trailer. Comparing specifications, the ExpertPower 100AH LiFePO4 battery can be discharged much deeper without damage, which means that the 100AH is almost completely usable. Also, the LiFePO4 batteries do not build up explosive hydrogen gas which means I could relocate it to inside. The compact size and the fact that the battery weighs only 29.7 lbs means that my useful cargo carrying capacity is now greater than with the Lead-Acid batteries since I save about 90 lbs with the LiFePO4 battery.

I had previously built a compartment inside in a place where wires were that was otherwise wasted. This looked to be the ideal spot to put the battery. It had easy access, both to install the battery and to run the wires needed. I also opted to install a battery cut-off switch (relocated from the old battery case) and a battery monitor that will act similar to a fuel gauge in that it monitors amperage in and amperage out and calculates the state of charge. This is needed because a simple voltmeter won't work. The way LiFePO4 batteries discharge is that they have a rather flat discharge profile until they get low. Then voltage drops off rapidly.

Beside the battery monitor, I needed to change the converter in my trailer since a lead-acid battery charger requires a different method of charging. We have a WFCO 8955 power center. WFCO makes a replacement converter that has the correct charging profile for LiFEPO4 batteries, WF-8950L2 MBA. One could get by with getting a stand-alone charger and not connecting it to the converter if that suits the installation better, but for us, this was the better option. I also probably could have gotten by with 6 gauge wire, but opted for 4 gauge because of the length of the run from the converter to the battery location. It will keep the voltage from dropping too much through resistance and be that much safer.

The specification state that I can expect >2,500 discharge/charge cycles at +20C 0.2C (which I take to be temps between 20C and .2C or 68F and 32.4F) if discharged 100%. If only discharged to 50%, the expected number of cycles increases to around 7,000. Even the lower figure far exceeds the expected life of lead-acid batteries. ExpertPower states an expected 10 year life.

Things to watch out for: Operating temperatures for discharge are -4 to 140F and charge 32-140F. Storage is between 32 and 86F. That is another reason for moving the battery inside. I can control the temperatures better when it is inside. Because LiFePO4 batteries have a very low self-discharge rate (approx 3%/month), one can charge the battery, disconnect it, and store it for a year at 77F and not damage the battery. The bult-in Battery Management System serves to protect the battery if conditions go outside safe specifications.

I have not had an opportunity to really put this to the test yet as it is winter and we won't be using it much until later this year. However, this seemed the best time to purchase and install it. I will update later after we gain experience with it and I can better report on how it performs.
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