BOTKU 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 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.

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.

Light weight, Powerful, holds a charge all day during use

30a Battery worked great until it was time to recharge it. Will not recharge. Tried to return through amazon but was told i could not, had to go through seller. Could not find way to contact seller, so went to leave 1-star review and the "contact seller" button came up. "Chat with seller" sent me to amazon customer service. Was able to get a refund. (Maybe, its pending). Was told i could do whatever i wanted w it. So I opened the top and low and behold the low temp sensor wasn't connected. Small wire and poor solder.

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

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.

I have purchased 4 of these at different times for powering homemade boomboxes. They deliver excellent power and run a long time for the application I’m using them in. Most of these builds have been in a rolling case about carry on sized with 400-500 watt amplifiers in them. Highly recommend!

After two years they have been reliable I must say. Then my gf serve me some hot fresh cheeks for me hard work!