2 Pack 12V 10Ah Lithium LiFePO4 Deep Cycle Battery, 3000+ Cycle Rechargeable Lithium Iron Phosphate Battery for Solar, Fish Finder, Power Wheels, Lighting, Off-Grid Applications with 20A BMS

I bought 2 BOTKU LIFEPO4 12.8V 10AH 128WH for my Cyberpower cp1500pfclcd. Wanted to see if LIFEPO4 battery would work. I fully charged the batteries on a separate charger to 13.5v (at rest). Ran the UPS at about 100W and it lasted 110 minutes until shutdown - 11.5v at rest (Meaning ~5% power left in the batteries). I let the UPS fully charge them and it stopped at 13.0v. Good to AGM but not high enough for LIFEPO4. Less than 40% of the capacity. I put the same load on and only got 15-16 minutes run time (when charged by the UPS). Cyberpower website say that I should get 66 minutes on AGM with 100watt load. The LIFEPO4 batteries worked well. Basically twice the run time of an AGM. Probably great news for many other uses. Its my UPS that is not compatible. I gambled it could be a replacement. Was wrong. But great batteries. Update a week later: good news. After letting the LIFEPO4 battery in the UPS a few days, the residual voltage began to climb by about 0.1V per day, to stabilize at 13.5V. Well, at that voltage level, the LIFEPO4 is fully charged. Ran for 100 minutes with ~100watt load. Will the trickle charge of the UPS eventually damage the battery? Time will tell. Even if life cycles are cut in half, or the reserve is reduced, is still better/cheaper than AGM type. And the UPS cuts off while the battery still has a 5-10% left due to the difference in voltage between AGM and lifepo4. This is good as the BMS does not lock the battery for being too discharged.

I have been replacing the SLA batteries in my UPS devices. I bought four of these to replace the batteries in the battery extension for my APC 1500Pro UPS. The SLA batteries were failing at 8 yrs of age. With the UPS on my wifes TV and computer system I have found the LiFePO4 batteries last nearly twice as long as the lead acid ones. Like all LiFePO4 batteries if you take them all the way to zero volts you have to disconnect the load then apply full voltage to the battery terminals to wake up the BMS and allow the charging process to take place again. I had to do that to recharge a LiFePO4 battery I have connected to a drill motor. Small thing would happen if used in the kids play cars if the battery went to zero. The initial cost is more but these last years longer so you save a lot of money in the long run plus you don't have to muck with the battery acid problem. I recommend these for anything but starting motors or applications where they are outside and below freezing.

One of the two original batteries ordered went bad within the first month of use.

I replaced a 12V7AH SLA battery in a CyberPower AVRG900U with this Lithium-based 12V10AH battery. This battery has the same connectors and is the same size as the SLA, but it holds a charge for months, charges much quicker than SLA batteries, is much lighter and should last 2-3x longer than SLA. I have unplugged the UPS to test it and @ ~20% of the 480W UPS capacity, the backup time was >30 minutes. The BMS is also interfacing well with the UPS charging system.

BOTKU 12V 10Ah is not usable in CyberPower CP900AVR UPS. Should be a nice upgrade from the 7 AHr OEM battery. The BMS, battery management system, should allow use in a UPS, although may not be enough voltage to fully reach 100% capacity. Batteries arrived with an initial voltage of 13.2 Volts as they should. Fits perfectly in UPS replacing the old batteries. Seemed to fully charge in the UPS. Played briefly to make sure UPS was functioning correctly and then let the UPS run until shutoff. I left the UPS powered up for 2 days to make sure the batteries were fully charged. Plugged in a 100 Watt load and unplugged the UPS from power. Within 5 minutes the UPS shutoff. The spec for the UPS with the smaller OEM 7 AHr battery is 53 minutes for a 100 Watt load. Either the batteries were bad or the UPS would not even minimally charge up the batteries.

There is rarely any battery out there with the same form factor that delivers constant 20A and 40A for 3 seconds. Bought to replace a ub1280 lead acid on an ancient APC BackUPS ES500 and the old Belkin Battery Backup RevB. Since these LiFePO4 batteries usually run at 13.2V for the majority of the time, it can be said that they can do 13.2Vx20A=264W, so say 250W max load for whatever you're doing. Calculate the loads before you plug it in, and also factor in for inefficiency if you have a larger power draw item. UPS charging voltage usually peaks around 13.5-13.7V which should charge these to around 90% full, so long as it's above 13.4V it should be good. Optimally we want it around 14.5-14.6V but I'm not electrical engineer enough to find out how to make a UPS do that. I would also be inclined to believe that you shouldn't always make it run close to 20A discharge since that would probably lower the lifespan of the cells dramatically, say somewhere like on a boat, but you would most likely be going for 50-100Ah batteries if you were boating.

So far, so good. Hope they outlast traditional lead acid in my UPS.

Good battery except that you need to run 2 in a parallel setup to run powerwheels/ kids ride on toys