ExpertPower 12V 20Ah Lithium LiFePO4 Deep Cycle Rechargeable Battery

(10 customer reviews)

Price: $189.99

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 95% 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. Built-in low-temp cut off prevents charging under 23 °F (-5 °C).

Brand 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

ExpertPower 12V 20Ah Lithium LiFePO4 Deep Cycle Rechargeable Battery

ExpertPower 12V 20Ah Lithium LiFePO4 Deep Cycle Rechargeable Battery

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.

EP1220ExpertPower 12V 20Ah Lithium LiFePO4 Deep Cycle Rechargeable Battery

ExpertPower 12V 20Ah Lithium LiFePO4 Deep Cycle Rechargeable Battery


ExpertPower is a Los Angeles based supplier of Energy Storage Systems located in the heart of beautiful southern California. Since its establishment in 1987, ExpertPower has worked hard to earn its reputation as the most dependable in the business. Our product reviews are from actual customers who both appreciate and trust the quality they have come to expect from our products.

ExpertPower 12V 20Ah Lithium LiFePO4 Deep Cycle Rechargeable Battery Specifications

  • 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
  • Operating Temperature: Discharging: -4°F to 140°F; Charging: 32°F to 140°F
  • Life Cycles: 2500 with 100% DOD; 3600 with 80% DOD; 7000 with 50% DOD
  • Built-in Battery Management System (BMS)

ExpertPower’s lithium battery is the next step to a cleaner, stronger, and safer power solution.


RV & Camper


Trolling Motor & Fish Finder


Solar & Wind Power


Power Blackout


Outdoor Activities


Other Drop-in Replacements

ExpertPower 12V 20Ah Lithium LiFePO4 Deep Cycle Rechargeable Battery

Additional information




Item Weight

5.8 pounds

Product Dimensions

7.1 x 3 x 6.6 inches


1 Lithium ion batteries required. (included)


Manufacturer Part Number



12.8 volts


256 watts



Date First Available

August 27, 2019

10 reviews for ExpertPower 12V 20Ah Lithium LiFePO4 Deep Cycle Rechargeable Battery

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    Amazon Customer

    This battery installed OK into a CyberPower 1500VA PCS Sinewave UPS. But when a small power blip occurred; all my lead acid UPS systems had no problem but the CyberPower 1500 shut off. I think this was because the UPS thought the battery was charged and even indicated with a 300W load that it had 32 minutes run time. But it was wrong. The load was shut off and the UPS shut itself off. I’m not disparaging either this battery or this UPS. Just, they don’t work together most likely because an SLA charger will not charge this battery. See the answer to the first question for more detail.

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    Van G

    I bought this battery refurbished and had it about a month before I started really using it. I hooked it up to a portable fridge (ARB Zero 47) and charged it with a portable Zamp solar panel. The fridge has a low voltage shut off feature. After a few days, the battery was no longer was charging. Not with solar or my other two dedicated battery chargers.Expert Power is currently working on a solution for me so I’ll come back to update this review.UPDATE 12/20:They sent me a replacement and it has been working fabulous since. About a half year in without any issues. The customer service displayed was wonderful and really couldn’t ask for more.

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    I am using the Expert Power 20ah LifePO4 battery for a portable crossband repeater for search and rescue. The light weight lithium battery was perfect in cutting down weight of the repeater. The up front cost is bit more than a SLA, but it’s well worth it. They best part is you get ALL 20ahs of LiFePO4, where SLA is maybe half it’s advertised capacity.I did a trial run, with the repeater pulling about 4 amps on transmit and .3 amps on standby. The repeater was on and actively transmitting a busy local channel. I expected maybe 8 hours of run time till it got low. It’s been going for 12 hours and is only down to about 60% capacity! I have an Expert Power 18ah SLA and you’d be lucky to run a radio for 6-8 hours before the depth of discharge got to low.Thanks Expert Power for a great battery at a great price. It is very well constructed, durable, and I expect it to last for a long time!

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    Sean Scott

    I’m in love with Expert Power’s 12v 40Ah LiFePO4 battery!I’m a competitor in kayak bass fishing and recently installed a 35lb. thrust trolling motor on my tournament kayak. Being a survey boat captain I have an OCD to have reliable equipment on all my vessels! So, I started my research on quality lithium batteries at a fair price. Narrowing it down to 2 batteries I chose Expert Power not going with the more popular company with the majority of the KBF anglers.And I’m so glad I did! This battery pushes me all day and still has a full charge at the end of the day! My competitors are even impressed with this 40Ah battery going just as hard as there 55Ah’s. I recieved my battery on February 10th and it’s now March 18th. When I first went out with this battery it was choppy water and I got water in the hull. Not much but enough to make contact my wires and trip the built in BMS to kill power supply. So I didn’t know what happened and contacted customer service at Expert Power and got a friendly gentlemen named Bryan. Well he walked me through a procedure to troubleshoot the issue and not much longer after emailing back and forth I was back in action. I’m so satisfied with the customer service I received! Bryan stayed in touch with me and even checked on me/battery when he didn’t here from me. In my last email to him I left my number and said to feel free to call. With no hesitation he did! Now that’s great service! After getting off the water today with high winds, and going out a couple of times a week since receiving my battery, I knew it was time to write my review. Let me put it like this, I will be buying every battery I purchase from Expert Power for now on! From a boat captain with an OCD to have quality and reliability equipment, I give my lithium battery and Expert Power purchasing experience on Amazon 5 stars. Sean Scott

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    Update: 6/22/2020We 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 purchase 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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    NorCal tech guy

    So far so good. The battery arrived earlier than promised in good condition and was well packaged. I replaced two 200 ah AGM batteries with this one 200 ah battery in my camper van. In the process I lost about 150 lbs of battery weight and probably added a bit of capacity as the AGM batteries were old.Coming from conventional batteries the first hurdle is that it’s hard to know what the state-of-charge of a new LIFEPO4 battery is. The battery was at about 13.3V and that’s the value roughly associated with about a 50% range of state-of-charge for LIFEPO4. I connected a small 4amp LIFEPO4 charger and basically nothing happened to voltage for about a day. Then finally the voltage went up and current decreased. I think the battery’s state-of-charge was about 55% when it arrived.Since then I have run various tests and the battery has been unflappable. It simply stays at 12.3V unless topped off. I connected a 100 amp load and voltage dropped to 12.6V while the load was active for about 5 minutes. When the load was disconnected it immediately went back to 13.3V. During that test I noticed that the negative terminal got very hot which had me worried. But when I looked closer I noticed that I had wedged the cable lug between 2 washers rather than having it in direct contact with the battery terminal. When I removed the bottom washer and repeated the test, the terminal remained as cool as the positive terminal.Now installed in my camper the battery works great and gets charged by solar, the alternator (via a DC-DC charger) or an AC charger depending on where I am. It runs a Dometic fridge 24/7.Time will tell if the battery is reliable but at this point I am very happy with the product.

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    Steve A Worth

    This battery does exactly what I wanted – powering a microwave relay for our very remote Internet. Used with a solar panel. But what I think is most important to know about this company is how amazing the customer service is. Had a problem which ultimately had nothing to do with the battery (though I thought it did) and they reached out to me to fix things. Class act. May they have many children.

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    I’ve tested the capacity and came up at 650W-hr at 0.5C discharge rate, so was very happy about that. I use this battery to run about 100W worth of appliances (lights and an air purifier) through a 300W inverter (separate purchase) when PGE cuts power in CA and I get 6 to 7 hours of power out of it. I love that this is lithium-based and can be entirely discharged without much effect on its capacity. Great deal.

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    2nd UPDATE June 26, 2020: Chiming in once again as I purchased and received a few days ago the 50ah LiFePO4 battery. This is in addition to my previous purchases of two 100ah versions and one 20ah version (see reviews below). I now own four LiFePO4s from Expert and they’re all performing great! I’ll likely be back for more, finances permitting.UPDATE May 7, 2020: In addition to my previous purchase of two 100ah batteries (see below), I just purchased a 20ah LiFePo4 from Expert Power for a small portable battery box I built. Same excellent performance as I reviewed on the 100ah models. Lightweight, quick charge, and full capacity/amp hours. Very happy with this purchase!Purchased 2 of the 100ah LiFePo4’s for emergency use, mainly to power my 2 12v portable refrigerator/freezers during power outages (hurricane area). But occasional boondocking as well. These babies are awesome! Passed their capacity tests and actually exceeded their listed rating. They run my 12v fridges for days. And I don’t have to worry about exceeding 50% depth of discharge like with deep cycle lead acid types. I get the whole 100ah’s! The recharging rate of up to 50 amps blows lead acid out of the water too. With my Progressive Dynamics 45amp lithium battery charger, I can charge these from zero to 100% full in just over 2 hours! Customer service was outstanding as well. Had several questions and even if I went to voicemail, Bryan there was always quick to call back and went above and beyond in helping me out. Also, if you’re looking for a battery box for this 100ah, this Attwood model is a perfect fit:

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    Amazon Customer

    I’ve had 2 of these 20ah battery’s in my tool trailer for two months now. I’m very impressed which them. They keep the refrigerator running 24/7 and allow me to turn on my inverter that charges my dewalt 20v batteries that I use everyday.

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