12V 20Ah Lithium LiFePO4 Deep Cycle Battery, 3000+ Cycle Rechargeable Lithium Iron Phosphate Battery for Solar, Fish Finder, Marine, Outdoor Camping, Off-Grid Applications with 20A BMS

If you are looking to replace the SLA (Sealed Lead Acid) batteries that are normally used in an APC UPS (Uninterruptible Power Supply), I can confirm the 12V 20aH lithium batteries will fit both the APC 1250 Smart-UPS and the APC 1500 Smart-UPS supplies. These are the somewhat older models that sit on the floor (not rack mounted). Putting the two batteries into the unit is a *tight* fit -- I had to actually lightly slap them down into the enclosure -- but you can do so and fit the cover on with the retaining screws. The inline fuse that comes with the UPS will not fit on the top of the LiFePO4 battery -- be prepared to either A) create a shunt to bypass the fuse or B) make up some longer wires that can route the fuse away from the top of the batteries. The batteries I ordered from Amazon came with mounting bolts that fit the battery terminals.All in all, it's a pretty basic conversion. Lithium batteries are far superior to the lead-acid variety and will last MUCH longer. I was only getting 3-ish years out of a set of SLA batteries whereas I can expect 8-10 years+ from these lithium replacements. A bonus in this situation is the original SLA batteries were rated at 18ah where the lithium are 20ah so I should get slightly better runtime during a power outage. Good luck with your conversion!

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 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.

High 20 amp continuous current rating makes these batteries really attractive for replacing stock AGM batteries in many UPS units. However, I docked one Star because out of 3 sets I ordered, one battery was dead right out of the box and would not take a charge. This is especially disappointing as the Mfg claims a 10 year lifetime with 3000 charge cycles. I hope this bad battery was a fluke, and not the norm for these...

I’m a ‘over the top amateur radio operator’ who is very involved in our ‘When All Else Fails’ charter of organized partnerships backing-up emergence communications of city, county, state agencies in organizations like RACES (Radio Amateur Civil Emergency Service). The ‘When All Else Fails’ comes from ham radio enthusiasts pride themselves on maintaining there stations totally independent of local power grid, internet, … and at our own expense have backup generators, spare car batteries, solar panel or two,,, mobile radios in our cars and HTs with many spare batteries.Lion batteries like this one are the new thing! Much more capacity/ operation time in a much smaller AND LIGHTER! size. While initially a bit pricey, competition and more efficient manufacturing has kicked in and we are now seeing grear reductions in price… AND increased capacity.After a lot of reading/ comparison this is the battery I chose as best capacity/ price/ sturdy case!

IM SHOCKED!I paired 2 of these together for a mobility scooter that we use to haul stuff in a junkyard. It definitely goes twice the distance from the lead acid batteries. No complaints yet.