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

Although slightly shorter in height than original batteries, work like a charm. I have replaced the batteries in a 90's fold n go power scooter with these amazing little gems. Can and does still use its original charger, battery pack is now half the weight of what it used to be, and packs quite the punch. Installed very easily by swapping everything over to the new batteries, fully charged in very little time and scooter that had been sitting for years was back on the road.

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

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.

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.

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.