12V 15Ah Lithium LiFePO4 Deep Cycle Battery 2 Pack, 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 owned 2 of these to use in an old fish finder for ice fishing. They cut the weight in half and last for days on the ice. I have the other one away, but then decided I needed another one. Far superior to lead. I used this with my flasher for a 3 day ice fishing trip and did not have to recharge even once. It also seems less affected by the cold when fishing outside then the old lead one did.

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.

Its a big battery and makensure measurements work. No charger make sure to habe charger on hand

They claim you can use a regular charger. I recommend if you do to have a timer in it so it chargets on long cycle of 6 hours then several short cycles of 1 hour. Still it's better to use a LIPO CHARGER. They are lighter than lead acid batteries and good for 6 to 10 times the number if charge cycles (3000 to 5000) and no memory so keep them charged if you are using them, 75% charge if in storage.

I wanted a battery for portable ham radio operation, something I could use for an hour or two with my TF_891 but was light enough I could backpack it. The rig can draw16-18 Amps on transmit but that's peak; average SSB even at 100W will be less as SSB is not full duty cycle. On receive, an amp or is all that's needed. I was able to operate for over an hour, not too much transmitting, and put less than 4Ah back into on charge. I had intended to dial my rig back to 60watts but forget and I learned that for a session that long, it's not needed. The BMS (Battery Management System) through me for a bit. I have several very good chargers for electric RC aircraft batteries. I tried each of those in LiFePO4 mode and all they did was throw errors. But now I suspect the way the BMS is designed is to make this "look like" a lead acid battery. I tried on 12V lead acid mode and it charges fine with one more thing to be aware of. After charging for a while, the "connection break" error is thrown by the charger. I suspect that is the BMS simply sensing the battery is fully charged and disconnecting. How good is this battery? You cannot tell with a review of a battery that's a month old. The real test will be how it work in a year or two after 50-100 cycles.

Purchased these to power our solar powered front security gate. I was a little apprehensive that these little batteries wired in series for 24 VDC would have enough energy to power our gate. But after installation and running the gate quite a few times to set everything up they worked without a hitch. And now that the gate is installed and operational we haven't had any problems at all.

Good quality and good value i use it for solar tracker actuator