NERMAK 12V 10Ah Lithium LiFePO4 Deep Cycle Battery, 2000+ Cycles Rechargeable Battery for Solar/Wind Power, Lighting, Power Wheels, Ride-on Toy, Fish Finder and More, Built-in 10A BMS

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.

So far so good. This is the second battery I buy from this vendor, and after observing good performance over a year or so, I felt compelled to write a review. The first battery was used for a kids ride on jeep running at 12V. This second battery was to upgrade that same ride on toy to 24V by connecting to the older battery in series. It seems the overcharge, overvoltage, and fault protection in the BMS circuit actually works. We have done all of the above and it still works. I didn't do a formal leakage test, but I know for a fact that it holds charge well over decently long periods of time and cold weather. As long as they don't change their process and material, it's totally good value for your money.

Very pleased. I used these batts to replace heavy lead batteries for my GoPed 750 ESR. It's almost the OG of electric scooters and have given mine, a new life. I know can travel further and faster with the new batts and they are crazy light weight. I can lift my scoot on the train with ease. I rarely give five stars but this is one purchase that really made a difference.

I’d recommend against usage for “legacy” UPS lead acid battery replacement, specifically the common case of quantity 4 or 2 battery systems. These usually are setup with the batteries in series (4x12v = 48v, 2x12v=24v). You are likely better off throwing the legacy lead acid battery UPS away, and buying a lifepo4 based UPS. Even the Lifepo4 portable batteries like the power 1000 have UPS capability. The ups devices that start with a lifepo4 energy source usually have passive and active cooling for the battery array, in addition to the inverter components. There are a few problems with using these in a legacy lead acid battery UPS: 1. The continuous output current is far lower than lead acid batteries. The typical Lifepo4 compatible battery option is rated at 10amp continuous. So, in a 4 battery series system, you’ll get at most about 135w continuous output per battery - so about 500watt max. You won’t get anything near the potential needed in common 1000w, 1500w, and 2000w ups. 2. The BMS present in the lifepo4 batteries generally needs at least exposed passive cooling, or even active cooling. These are enclosed package batteries, so cooling is limited at best. 3. With 4 12v lifepo4 batteries in series, you’d basically need another BMS to manage the 4 batteries, or the discharge and charge levels between batteries becomes imbalanced. 4. The charging circuit will not fully charge lifepo4 batteries, in most cases. Lead acid vs. lifepo4 have different max voltage levels. 5. The legacy ups doesn’t know the proper estimated runtime or charge level of lifepo4 batteries. This is a relatively minor issue compared to above. Technically, a 48v lifepo4 pack that fits most UPS battery compartments could be built to handle several of the issues above. As an experiment, I fully charged up 4 of these individually outside a UPS, then installed them in the ups. Verified the output of the pack was approx 55.8v. The charge/discharge circuit ”popped” with the telltale electronics burning smell, with smoke, when a 200w load AC power fail test was triggered. These batteries may be ok for some cases, like the single battery backup common to home alarm system panels.

Bought for peg perego ride ons. They work great and so much longer life than lead acid. They did charge fine with a 10amp charger without issue. So far so good. I do love how small and light lithium batteries are.

Just a few days into owning this battery, and so far, so good! It’s a perfect match for my UPS 550 (model B0019804U8—the same trusty unit I purchased years ago). Compatibility Check: The UPS recognizes and charges the battery without a hiccup. System Integration: The data cable accurately reads the battery's charge capacity—no issues there. Performance Under Load: The UPS does its thing like a champ, seamlessly drawing power from the battery without errors. Now, onto the one thing I can’t tell you yet: whether this 10Ah battery offers longer run times compared to the 7Ah OEM version. Honestly, I’ve never paid much attention to runtime—I just configure the system to keep my home server running until it gracefully shuts down. (It’s tucked away in a basement closet, doing its thing.) For comparison, I have another UPS 550 with a 6+ year-old OEM battery, but let’s be real—it’s way past its prime and totally untrustworthy for runtime comparisons. The Bottom Line: If you’re looking to save some cash on a battery replacement, this one is a solid option. It’s significantly cheaper than the APC-branded OEM battery and only slightly pricier than the absolute bargain options. That said, I’d think twice about going for the cheapest of the cheap—after all, this is a battery we’re talking about. You don’t want something leaking, exploding, or catching fire! Even if it’s not a “true” 10Ah battery (who really knows?), it’s doing a great job in my book so far.

So ive been using these for about 3 years in some UPS units. Been working fine for the most part but it seems like the non-digital UPS units like the ones that sit on the floor will overload these batteries and cause damage to the BMS or something. I had 2 batteries die, one the voltage just dipped down to 2.3v and another the BMS got so hit it was melting the plastic on top and triggering a cut off. I brought up my issues to nermak on amazon and they shipped out 2 replacements immediately, got them a few days later. Very quick response and zero hassle, which is what all manufacturers/sellers should do. Using these in digitally controlled UPS units like 1000va+ (basically the towers) seem to have no issues over long periods, but APC doesnt recognize the chemistry difference at all and wont fully use the whole capacity of the battery. So im just gonna put all these into a batbox with a inverter and put the lead acids back in. Over all good battery, and good support. Im sure with everything working correctly these will last many years. I think i just got a couple duds lol.

Update 4 days later, 10/11/2024 Well...this did not work out. The battery arrived and was installed on Monday, just before Hurricane Milton struck Wednesday night. After a1/2 second test crank (which was fine), the battery was connected to a new LiFePo4 battery charger designed for this battery chemistry. The charger itself may be suspect, as the battery would not accept a charge. The charger displayed a fault mode after a few hours. I then connected it to a known good charger. After a charge of several hours at 2amps, the charger had to be disconnected as we prepped for the storm. A quick check on Tuesday (the next day) found that the generator would not start. Did not have time to do diagnostics with the storm coming. Had to pull-start the generator after we lost power Wednesday evening. Did diagnostics today, Friday 10/11. No problem with the starter motor, as it started immediately with my portable jumper pack. The Nermark battery showed less than 10V on my DVM. Both chargers displayed a battery fault, and were unable to charge the battery above 10.3V. It's possible there was an issue with the built-in BMS (Battery Management System), but I don't know. It's getting returned once Whole Foods is open again. Original Review 10/7/2024 Very simple installation to remove the old sealed lead acid 12-18 battery and replace it with this one. I have been using LiFePo4 batteries in my RC aircraft for over 20 years and I'm glad that this battery is available to replace the typical unreliable lead acid battery that is used as a starter in portable equipment. I took the opportunity to install the terminal rings and cable for the appropriate 3 amp charger and even without completing the charge, did a quick test start on my generator. I hope it will last several years, as this generator is only used for hurricane emergencies. However, I have batteries of this chemistry that are over 20 years old and still hold 80% or more of their charge. I will report back and update this review in the event that there are any failures, or possibly great news to continue to report years from now.

después de meses usándolas, diversos cortes de energía al en estos meses, puedo decir que respaldan mucho mejor que las que traía mi UPS de ácido, sin duda compraré más este tipo de productos por su relación precio/calidad