NERMAK 12V 20Ah Lithium LiFePO4 Deep Cycle Battery, 2000+ Cycles Lithium Iron Phosphate Rechargeable Battery for Solar Power, Lighting, Outdoor camping, Power Wheels, Fish Finder, Built-in 20A BMS
Condition: New
Buy Now, Pay Later
As low as
$8.67
/ mo
Learn more
- – 6-month term
- – No impact on credit to apply
- – Instant approval decision
- – Secure and straightforward checkout
Ready to go? Add this product to your cart and select a plan during checkout.
Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.
Learn more about financing & leasing here.
Selected Option
Free shipping on this product
30-day returns
Learn more
FREE 30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
In Stock.
Arrives
Monday, Oct 19
Recently Viewed
Style: 12V 20Ah
Features
- Superior Performance: Lithium iron phosphate battery has high energy density, Long cycle life, Good safety performance, No memory effect, etc. NERMAK LiFePO4 battery has built-in BMS protection to prevent overcharge, Over-discharge, Over-current and short circuit, and excessive low self-discharge rate ensuring up to 1-year maintenance-free storage.
- Long life & light weight: 2000+ cycles of lithium-ion batteries are no problem, while traditional lead-acid batteries only have 200-500 cycles. The battery does not contain acid, which is safer and more environmentally friendly than lead-acid batteries. Our lithium iron phosphate battery weighs only 5.5 pounds, which is only 1/3 of the weight of a lead-acid battery.
- Widely Uses: Widely uses in most areas such as: Lighting (LED strip etc), 12V router, RV/outdoor camping, Fish finder, Backup power, Tool trailer,Off-Grid applications, Solar/Wind power and more...
- Expansion and RechargeCan be connected in series or parallel, in series, Up to 4 identical batteries can be connected,Quick charge by 12A , and heavy-duty output discharge up to 20A continuous and 3C Pulse.
- Warm Note: 1* 12.8V 20Ah Replacement lithium ion battery,12 months warranty, If you have any question for our product, Contact us: click the "Ask a question" on our storefront or in "YOUR ORDER" options click the "contact seller" (please use LiFePo4 special charger, with fully automatic SLA charger may not be fully charged)
Description
LiFeP04 batteries are maintenance-free batteries, If you need them all the time, Then lead-acid becomes too unreliable and laborious, The battery's lithium-ion properties reduce the weight of traditional lead-acid batteries to less than half, While significantly improving performance and capacity, Traditional lead-acid batteries contain large amounts of lead, After disposal if not properly disposed of, Will pollute the environment, While lithium materials without any toxic or hazardous substances, Recognized by the world as a green battery, Its great durability allows you to easily use them at home and at work, Or safe outdoor needs , The environment is most important. Founded in 2014, the company is a professional new energy battery and accessories manufacturer. Has a R&D team with nearly 10 years of industry experience. Insist on using brand new A-grade battery cells. Strict quality control assembly factory Provide customers with more and better quality products
Brand: NERMAK
Vehicle Service Type: Fish Finders, Ride-on Toys, Camping, Power wheel
Size: 12V 20Ah
Voltage: 12.8 volts
Battery Cell Composition: Lithium-Phosphate
Item Weight: 4.3 pounds
Product Dimensions: 7.15"D x 3.03"W x 6.69"H
Terminal: Screw Terminal
Battery Capacity: 20 amp_hours
Unit Count: 1 Count
Compatible with Vehicle Type: Fish Finders, Ride-on Toys, Camping, Power wheel
Voltage: 12.8 volts
Terminal: Screw Terminal
Battery Capacity: 20 amp_hours
Size: 12V 20Ah
Item Weight: 4.3 pounds
Item Dimensions D x W x H: 7.15"D x 3.03"W x 6.69"H
Battery Type: Lithium-Phosphate
Brand Name: NERMAK
Manufacturer Part Number: 12V 20Ah
Unit Count: 1 Count
Model Number: 12V20A
Manufacturer: Huizhou Yu'an Technology Co., Ltd.
Number of Items: 1
Included Components: 1*12.8V 20Ah LiFePO4 battery
Manufacturer Warranty Description: 1 year
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Monday, Oct 19
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
- Klarna Financing
- Affirm Pay in 4
- Affirm Financing
- Afterpay Financing
- Zip Pay in 4
- Financing through Apple Pay
- Financing through Google Pay
Learn more about financing & leasing here.
Top Amazon Reviews
Style: 12V 20Ah
I picked up this NERMAK 12V 20Ah LiFePO4 Deep Cycle Battery to build out a custom, mobile 12V auxiliary power pack for my outdoor shop tools and high-flow pressure washer supply pumps. To handle outdoor overspray and demanding start-up currents safely, I paired this battery directly with the 12 AWG marine-grade waterproof fuse holders I reviewed previously. This setup has operated flawlessly, proving to be a highly efficient, lightweight power source that works just fine under continuous workshop load. Why this LiFePO4 battery is an exceptional energy upgrade: Shockingly Lightweight Footprint: If you are used to lugging around old-school 12V sealed lead-acid (SLA) batteries, switching to lithium iron phosphate is a total revelation. This 20Ah pack delivers twice the usable energy capacity of a comparable SLA battery at a tiny fraction of the physical weight, making it incredibly easy to integrate into a mobile tool carriage or camping rig. Dependable 20A Built-In BMS Protection: The integrated Battery Management System (BMS) is excellently calibrated. It monitors cell balance and protects against short circuits, over-charging, and deep over-discharging. It handles the continuous high-amperage current draw of my auxiliary water pumps with zero voltage sag, clicking off instantly only during genuine over-current thresholds to protect the internal cells. Flat Voltage Discharge Curve: Unlike lead-acid cells that suffer from constant voltage drops as they deplete, this LiFePO4 battery maintains a rock-solid, steady 12.8V output through nearly 90% of its discharge capacity, keeping connected pumps running at maximum efficiency right until the pack is empty. Workshop Wiring & Charging Tips: Always Pair with Circuit Safety: Because lithium batteries can discharge energy incredibly fast during a dead short, do not wire them raw. Follow my previous build steps and splice a dedicated in-line fuse holder (equipped with a 20A fuse to match the BMS ceiling) directly onto the positive lead wire right at the terminal. Utilize a Dedicated LiFePO4 Charger: Do not attempt to charge this with a legacy automotive lead-acid battery tender. Lithium chemistry requires a specific multi-stage charging algorithm (typically pushing a bulk charge up to 14.4V–14.6V) to properly balance the internal cells and hit that advertised 2000+ cycle lifespan. The big takeaway: NERMAK has delivered a premier, ruggedly housed power cell that offers an unbeatable combination of capacity density and safety features for a very reasonable price. The screw-down terminal posts are clean and provide a rock-solid mechanical connection point, the internal protection circuits are highly responsive, and the weight savings are massive. It is an exceptional value purchase that modernizes any custom low-voltage electrical build.
...
show more
Reviewed in the United States on June 3, 2026 by J.S.
Style: 12V 20Ah
Update 1/20/2026 I am raising my product review to 5 Stars because of excellent Customer Service. The seller reached out to me and offered a replacement or full refund. I purchased an Eco-Worthy battery right before I returned this one, except a 30Ah instead of a 20Ah. I assembled a whole Brand New system around it and the Eco-worthy lasted exactly Three Days and did the exact same thing. These batteries are leaving the factory with unbalanced cells, the lowest voltage cell is going to pull the others down and instant BMS chip failure. Now I have to return the Eco-Worthy battery. All my old SLA batteries are old and need replacing so this is about the only way to go. You NEVER want to buy used or Bin store or reseller batteries ever, This is a great seller and I am going to continue to order from this seller simply because of the excellent customer service. Which for these batteries is something you are going to need or find out the Hard Way. My other NERMAK 20Ah battery is hanging in so far, fingers crossed! Great seller, Highly recommend. I bought one and my wife ordered one on her account. They charged up just fine, I put one in my solar power system with a 150 watt inverter, high end charge controller and 200 watts of solar panels. It ran fine for a few days and we went to the store, came back and the inverter was beeping and the charge controller said zero volts. There was NO reason that battery should have died like that, under full sunlight. I returned it with no issues and I got a full refund very quickly and ordered a different brand of battery. Have not received it yet. I did attempt to recharge the battery on my smart LiFePO4 charger but the charger would not even turn on. This battery definitely has a faulty BMS chip or something. The 2nd battery did the same thing the other day, but I was able to make it come back to life and is holding in there, but now I always turn the inverter off when I leave. If it lasts 6 months I will come back and update this review and give it the proper star rating. But great seller, fast ship, and no problems with the return. Very happy and confident buying off Amazon.
...
show more
Reviewed in the United States on January 12, 2026 by William
Style: 12V 20Ah
Won’t hold charge after 2 charges on a 12V 2A charger. Just outside return window. Not good quality control.
Reviewed in the United States on August 30, 2026 by H32NV
Style: 12V 20Ah
Batteries are holding up well, wired 2 in parallel to get 40ah battery pack for an Amateur radio portable power box. Powers 2 radios all day with barely any capacity loss. Also works great for running a small inverter to power 2 CPAPs during power outages at night. Great price for plenty of power
Reviewed in the United States on August 16, 2026 by Bryan
Style: 12V 20Ah
Works great powers my fish finder better than my 100 ah traditional deep cycle. How ever everytime you double the amps being drawn you will reduce reduce the hours it will run due to thermal loss. My 1amp fish finder will run for 25-30 hours.... but when you run a 15 amp item you will only get like 45-60 minutes of run time. Which is half of what you should get... extra time is lossed in heat in the battety
...
show more
Reviewed in the United States on August 31, 2024 by Shaen
Style: 12V 20Ah
Shockingly good. My old battery weighed 10lbs and this one was 4.5. Cranked a 20hp kohler immediately in summer temperatures, have not tried winter cold crank amps.
Reviewed in the United States on September 21, 2026 by STP
Style: 12V 20Ah
Great battery for rain barrel water pump. Holds enough power for several days of use.
Reviewed in the United States on August 22, 2026 by Phil Hanson, Jr.
Style: 12V 20Ah
I needed replacement battery for my Tzora electric scooter, and the 25 AH lead acid battery pack. This barely fit into the enclosure of the lead acid battery, I had to modify it somewhat, so I could not recommend it for that use. In other scooters, it should fit great. If you are handy with tools, then it might work great for you as well. It seems to offer a higher voltage than the 25 AH lead acid battery, the voltage always reads top of the range in the volt meter. It does not sag as much when going up a incline. It feels more powerful than the 25 AH battery it replaced. But it also has the problem of shutting off when the voltage is low, not just slowing to a crawl when the voltage is low like a lead acid battery. It is a safety feature of all lithium battery packs to shut themselves off at a low voltage cut out. Just be sure to recharge it more often. I would expect a longer range than the 25 AH lead acid battery, and many more recharges than lead acid style battery.
...
show more
Reviewed in the United States on May 11, 2026 by GoldenHVAC