Nermak 2 Pack 12V 10Ah Lithium Ion LiFePO4 Deep Cycle Battery, 2000+ Cycles Rechargeable Battery for Solar/Wind Power, Scooters, Lighting, Power Wheels, Fish Finder Built-in 10A BMS

We bought our kids a used burromax electric dirt bike. It uses 2x 12v batteries in serial. It needed new batteries when we got it so I bought some cheap lead acid ones on amazon. Together they were about $40 and gave us about 30-40 mins of runtime. We used them for about a month and the runtime dropped to 20 minutes. I had looked at the lifepo4 batteries before but didn't want to invest $100 more into a used dirt bike, but I'm glad I finally did. The difference is incredible. These things go for hours, in fact the kids get tired of riding before the batteries run out. I was also worried about charging them. I bought a lifepo4 charger but it's kind of a pain to take the batteries out to charge each time. The charger I have is for a slightly lower voltage ( look up the difference between lifepo4 and lead acid) so I knew it wouldn't charge it completely if it worked at all. Let me tell you, even on a 90% charge these things go and go and go. My youngest boy rides next to me on my road bike and we cruise around our small town at 15 miles an hour without a care. Our longest ride together is about 8 miles and it still said max charge on the indicator. I know most people will have other uses for these, but from my experience they work great, and I only wish I would have bought them sooner.

may take longer to charge but lasts much longer than OEM lead-acid ones getting hour+ ride time on Razor go-cart

These work wonderfully! I bought them to replace two batteries from a ‘scooter’ for disabled or elderly people. The original batteries were ni-cad and although used just a tad several years ago, would not charge or work. These new 12V lithium batteries are much lighter, easily fit into the compartments because they are smaller and connected with the modular connections flawlessly. They charged well, hold much more power than the original batteries and will last many years longer! I am very pleased with my purchase of these batteries.

Worked great for the first few cycles then the capacity fell off a cliff and would only provide 2 or 3 Ah. No where near the full 10 Ah. After some research it seem the likely explanation is the battery contains cheap mismatched cells with poor internal battery management circuitry. When charging, one cell reaches it’s full voltage, then shuts off to prevent overcharging. This prevents the other partially charged cells from completely charging. The result is a battery that measures a fully charged voltage then discharges rapidly because it is effectively running off one cell.

Overall good quality. The capacity measured around 14 Ah for both discharging and charging, despite the fact that 10 Ah is specified.. However, I tested them under low-load conditions, just 1A. Keep in mind that there will be a significant voltage drop under heavy loads. With a 7A load, the drop was 1 volt; instead of 13.3V, you get 12.3V, causing your charge controller to mistakenly indicate that the battery is nearly depleted. So, yes—the batteries can handle loads of up to 10A, but this comes with a substantial drop in both voltage and capacity. Instead of 14Ah, you get 10Ah. That is precisely why they rate them at 10Ah: because that is the capacity available under maximum load. 4 stars due to the significant voltage drop. That said, the battery cells themselves appear to be of quite good quality, with low degradation rate. However, they are definitely not rated for a 10A load; I’d say 5A is the maximum, but better for long life use 1-3A.

I purchased two 10 AH 12 V batteries and received them today (6-30-26). I installed them in my Cyberpower CP1500PFCLCD UPS as a test to see if they would both fit and power the unit. The fit test worked great. I was concerned that the dimensions listed for these LiFePO4 batteries were slightly larger than those listed for the OEM batteries. I tested functionality both plugged in and unplugged with the UPS powered on and everything seemed to work as it should. I then connected the UPS with my electronics and turned it on (connected to the AC power) and everything is working OK so far. At present, I see no reason why Cyberpower ups owners shouldn't use this battery substitute instead of the OEM lead-Acid version but I will update this review in the future if I encounter any issues with these batteries. Afterthought: While the mfgr doesn't recommend this battery solution for UPS above 1000 VA, I felt confident using it in a 1500 VA unit because my electrical loads are very light compared to the UPS rating AND I have whole home electrical backup so the UPS would not have to carry the load using the batteries for more than 2 seconds when an outage occurs. I don't know if I could honestly recommend this solution for someone who relies solely on the UPS for backup during a long outage with over 1000 watts of load connected. Be sure that you will only expect light loads during any outage if you decide to install these batteries in your UPS. For those wondering why I even use a UPS with whole home backup: The delay to switch to the home backup can take as long as 2 seconds to kick in when a grid outage occurs. The ups switches much faster (~ 20 ms) and keeps my electronics powered during that short delay.

Used to fix my kids electric dirt bike. Works better than before and the batteries are about half the weight of the original.

3 of the 4 batteries I received still work and charge. One battery seems to have died and will not take a charge. Apparently the return window is up and I can't get support. Would not recommend simply because one of the batteries have already died. I purchased in February 2026. Nermak reached out and refunded me the amount for the battery. Customer service team stepped up where the battery failed and made things right. This shows they stand behind their products and understand sometimes things happen. I appreciate the assistance and have adjusted my review rating due to exceptional communication and customer service.