12V LiFePO4 Battery - 12 Volt 7.2Ah Lithium Battery LiFePO4 2000+ Deep Cycle Rechargeable Built-in BMS Battery Perfect for RV Kids Scooters, Fish Finder, Solar, Off-Grid Applications

They seemed to be perfect, but the instructions that came with them said not to use them in series. I needed to use them as 24V in my lawn mower, so they needed to be sent back. Amazon was great in accepting the return. i then purchased two Lithium-Ion batteries from Amazon that could be used in series.

Took some modifications but this beast got my dead speaker. So far so good.

There is no way to contact the seller. A battery failed because the BMS failed and Amazon said to contact seller.

After running test on these batteries I found that my inverter was what was draining them. The battery itself was performing perfectly once I changed my mastercraft inverter in for a shcumacker 410 watt inverter. Thing is amazing now

Battery has been working well first of many months in the books

I connected this battery to my scooter utilizing a parallel connection to increase capacity. Doing this improved the distance my scooter can travel on a single charge by several miles. This battery is lightweight, much lighter that my scooters original lead acid battery. It's small size and light weight mean this battery can be used in conjunction with my other batteries and stored on my scooter. Excellent value, brought new life to my scooter at a fraction of the price. I've charged the battery for over one year with my scooters manufacturers charger and a smart car battery charger with no issues. Lots of bang for your buck!

This is really a great solution: the latest battery technology, but with built-in smart BMS monitoring so it should be able to replace earlier gel batteries in older devices with earlier charge systems. I think of it as getting a major upgrade for an older product with a vastly improved deep cycle life. It arrived charged to 13.36v, but I topped it off first with LiFePo specific charger I have, ending at 14.52v, then after a couple of days, checked and found it had settling back to 13.68v.A check on current showed it was then a full 7.12A. Perfect! But I suspect I could have done it just as well with an old Battery Tender gel trickle charger I've had for years. With its own BMS built in, it should charge it pretty will with older style chargers so long as the charge current isn't high (keep it perhaps around 1-2A tops, and lower is fine), and not either really cold or hot ambient temps if the charger doesn't include any thermal charge cutoff protection.Which also means it should be able to substitute for an older battery type, giving that equipment a major upgrade. I One other big benefit I noticed immediately is the considerably lighter weight: 1Lb. 15oz. vs. 5Lbs. 2oz. for this same size gel cell (12v 7A). That makes a big difference when lugging around a UPS and trying to situate it under a desk up in a corner when it now weighs three pounds LESS, yet has a LONGER LASTING battery for less frequent service needs.Gotta love everything about these. One detail you might want to know is this battery comes with the smaller 3/16" push on connectors rather than the 1/4", so you might have to make or else buy some pigtails to adapt to many devices. I've run into this a number of times before, so I had some pigtails on hand so it could go into a UPS with a dying gel cell. The only other thing I'd have wished for was a version with a couple more amps for a bit longer backup runtime. But the trade-off of 100's of more deep cycles is worth it.Now, I just need eight more over the next year or two for all my UPS boxes, and an alarm system. But this type battery has to be the way to go, and maybe see better life expectancy for the dollar. This would also be an ideal replacement in newer cars with a memory life support supplemental battery, since they can potentially undergo many cycles if the vehicle has the all too often parasitic primary battery drain, aggravated by not being driven or given any additional charge for weeks. Overall, I give this five stars. Time will tell if it tolerates somewhat older charge systems via its built-in BMS, but hopefully it will have no issues.

Out of the box I accidentally hit it with a 4 amp charger set to 12 volts. Poof! DOA battery.