DR.PREPARE 12V 20Ah LiFePO4 Lithium Battery with Grade A+ Cells, 4000+ Deep Cycle Lithium Iron Phosphate Rechargeable Battery with 20A BMS for Fish Finder, Solar, Lighting, Alarm System

After a full initial charge, I discharged the battery down to 10.5 V, and it rebounded quickly to 11 V. So far, I’m very happy with the performance. This test was done at a 2-amp discharge rate, and the voltage stayed extremely steady right up until cutoff. A heavier load test is coming next. Before running a higher-current test on the 20 Ah battery, I also tested the 100 Ah battery I purchased—and the results were excellent. I had to be gentle with my tester to pull enough current over a reasonable time span, but I managed to measure 99.12 Ah over approximately 9 hours and 57 minutes, at an estimated 8–10 amp draw. These were the very first charge and discharge tests, completed within days of receiving the batteries. I plan to continue testing and will update this review if anything changes. As of now, $120 for 100 Ah and $46 for 20 Ah feels like a very solid value. Update (2-7-26): After a few months of light, occasional use, both batteries are still performing great. I recently purchased a BT90 Pro battery tester with lithium testing capability. After partially discharging the 100 Ah battery and letting it sit unused for a couple of months, the tester still reported it as being in excellent, full-charge condition. Out of curiosity, I also tested the battery’s 100-amp maximum discharge rating using a Harbor Freight CEN-TECH 100-amp load tester. It successfully delivered 100 amps for 9 seconds without the voltage dropping below 12.6 V. The battery stayed cool throughout the test, and the BMS did not trip. Everything continues to work exactly as expected. I’ll keep testing and updating if anything changes.

Works great haven't had any problems out of this battery. Have been going o 6 months now problems

Surprised me , replace 8 6 volt batterys that weighed over 480 lbs with 4 of these . Works great . They are 27 lbs apiece which is 108 lbs .

Decided to convert from SLA to LFP (LiFePO4 Lithium) batteries for my UPSes. These batteries fit perfectly. I charged each with my Lithium charger and installed them, plugged into grid power, check voltage and frequency, 122 volts @ 60 hertz, hooked up to a load source and powered up at 64 watts. Pulled plug from grid and it kept running as expected. I did notice the voltage dropped from 122 to 112 volts but frequency stayed at 60 hertz, showed it would run another 55 minutes with that draw. Very much lighter as it has 2 batteries and each is half the weight of the original, so I reduced by about 4-6 pounds.

Very good life batteries, very nice to have an charge inducator

First of all, as far as the products go, it seems they most of the time do well, I just got a faulty battery from the beginning. My problem is with the customer service and seller. One of my batteries wasn't charging equally with the other no matter what we did. Charged it separately and no matter what it would never charge equally with the other battery. Anyways, got in contact with the seller after a few months and they basically told me that it's fine... Well it wasn't, lifepo4 batteries are not supposed to do that. Fast forward a couple years and the battery that was having the issue just dies on my randomly, so we disconnect it from the other and are able to eventually bring it back to life. A couple months later it quits again out of the blue shutting down my whole system, so I reach out to customer service for a replacement battery since it was under three years old as the warranty states that a replacement battery will be provided. After they sent me through a ton of hoops that took days of communication before they would offer any kind of replacement, we were able to get the battery to charge right again, but at this point the battery cannot be trusted anymore after failing twice that close together. To which the company said the best they can do is a 50% discount on my next order, like I would ever buy from them again. At this point I looked up their warranty and told them that their warranty stated that if it's a manufacturer defect they must either replace the battery with a new or refurbished battery or refund a certain amount depending on how long I've had the battery for (which they have the order date on file by the way, they should know this). They then told me that yes this is true, and that they could offer me a 50% refund or a refurbished battery, but the battery may be a few months because they didn't currently have any refurbished ones to send out. After looking at my order date myself I realized that my batteries weren't over three years old yet, which under the warranty policy means they have to with provide me with a brand new battery, or an 80% refund. After telling them this they said that yes that is what the warranty states and that they would now assist me with a new battery (all of this u had to fight tooth and claw for), but that they needed me to send back the bad battery to them through a fed ex pick up, which where I live does not work, fed ex can not get to me. Also no fed ex stores around me can accept batteries due to hazardous material laws. When I told them my problem they proceeded to ignore me for days....and days... Until I finally got sick of it and told them I would just accept the 50% refund since I couldn't do the FedEx pick up. Guess what? they got back with me immediately after that and told me they would do the 50% refund.... Shocker. Either way, the other battery I got from them originally seems to be an okay battery, and they're products seem to be decent, but do NOT expect them to stand behind their warranty or help you out if you do have problems unless you fight them with every step, and are also willing to quote their warranty to them. They want to do the BARE MINIMUM.

The shipping was fast. On arrival, multiple tests were completed, and the battery performed better than advertised. The battery will be put into service on my 5th wheel RV, working in conjunction with my Pecron E3600 solar generator. This battery replaces my conventional lead-acid battery to power the many 12V appliances and lighting. The test will be over the next couple of months as we travel through varying winter conditions. Charing is a combination of 400 watts of solar and the RV's converter.

Light, fits under the seat of my boat, plenty of power to run my trolling motor, and a charge really lasts.