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 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.

I use mine to run the diesel heater in my truck camper and it works fine with just these two. They don’t last forever but they’re fine for taking the chill out of the air when camping

I use small 12 volt batteries for the ignition systems of my antique cars. They are compact, and use slip on connector terminals. This makes it easy to move the battery from car to car.

Just a warning. The 30Ah batteries that I bought (and it looks like the 20Ah ones are the same height in the description) batteries are just SLIGHTLY taller than a 12v 17Ah SLA battery. The description shows that now, but I'm 90% sure I checked before I ordered them and it showed the same exact size size as a 12v 17Ah SLA battery. I could have just looked at too many batteries and made that mistake on my own so I'm not saying the description was changed, but I want to point it out for anyone reading this and thinking of buying these. It's not an issue if you're aware of it and plan for it. If you put two of these into an old APC SU1400 UPS, you're going to have to bend the tabs inside the UPS. I have them in there right now. I have no idea if I can ever get these batteries back out. Also note that if you decide to try these in an old APC UPS, the battery terminals are different (obviously) and the fuse that came with the UPS won't fit standing up. It hits the circuit board in the back. Also, if you buy automotive "bolt-on" fuses that LOOK like they'll fit, they are too short as the fuse is 1.61" in overall length, not between the center of the holes. That's exactly what all the descriptions for the fuses show, I was just "hoping" it'd fit. I just "trimmed" the fuse with wire cutters, but that's a hack and would most likely overhead if used anywhere near the fuse rating. I bought an 80A fuse instead of the 100A that came with the UPS, , due to the battery rating,but I bet the batteries would shut down before that was needed (I hope).With full load on my UPS and reading the current between the batteries (where the fuse would go) I read just over 8 amps, so I don't expect to draw too much current for these batteries. I have no idea if the UPS will draw the batteries down too far to not come back up without applying outside voltage to them, but I'm hoping the UPS will shut down and stop drawing anything from them before that happens. We'll see.Note that the batteries say 40A continuous draw and 80A for 3 seconds, but the "user manual" that came with them says 30A continuous draw with 60A for 3 seconds. I have no idea which is correct and I didn't test it. It doesn't matter for my application, but just something to be aware of.Oh, also note that MANY people online say not to put LFP batteries in a UPS looking for SLA batteries, so do that at your own risk.These will never be 100% charged by the UPS and that's fine with me. I'm planning on longer run time (I haven't test it yet to see how long I get) and the most important thing is not to have to replace the batteries every 2-5 years. SLAs always seem to die when you need them and I have hope these LFPs won't. Even if they do die in a few years, they were only about $20 more than a replacement set of SLAs for me.

This was my first experience with a lithium Iron phosphate battery, but I needed something small and light I could load into my dinghy to power my trolling motor. The discharge rate is impressive. I hooked it up to my motor, which supposedly draws up to 20 amps, and ran it at home on medium speed for 40 minutes. Checked with a multi-meter, the battery barely showed any drop. Similar result for the water trial, powering an 8 ft dinghy and myself through calm water for better part of an hour. No issuers with overheating or even getting warn during charging or operation. And the handle makes it easy to load and unload on the dinghy. Definitely the perfect battery for this purpose.

Have 2x of these outputting 24v in my daughters Razor Pocket Mod scooter. These took off an incredible amount of weight and the power is more punchy than before. Run time is greatly extended. Charge times are very similar to lead-acid was though.These work so good I bought 3x more for my son's Razor RSF650. Dropped 25lbs of weight and added extra run time, more punch. Fantastic upgrade.Tools/supplies:Wire stripperAutomotive wire end crimp plierGold plated 14-16AWG female disconnectsElectrical tapeWire cuttersEasy and wow what a nice difference. The now easy moving them around in and out of storage, the ride time increase, the better balance of the scooter/bike. Razor batteries are junk and cost more.. I'll be buying these.