Miady 12V 7.2Ah 2000 Cycles Sealed LiFePO4 Battery for UPS, Burglar Alarm, Chairlift, Fish Finder, Electric Scooter and etc. Rechargeable & Maintenance-Free, 10.1x7x9cm

I've put 5 stars for longevity - but I've only had it for a day and a bit. I have no idea how long the BMS will last on it, but since the capacity measured just fine, I'll take a punt on speculating that the cell quality will last for the suggested cycle time.I spent £26 on this. Prime delivery. It seems such a low price for the capacity, for LiFeP04, I had some doubts as to what I was getting.When it came, the voltage was very low ... I forget .. maybe 11V ish, and I thought "uh oh".But yesterday I charged it using a cheap buck boost with display CC/CV thing (two for £15 ish) also bought from Amazon, set to 2A, at approx. 14.45V (precision not intended to infer actual voltage). The battery took a charge just fine. The buck boost, powered by a one of those universal laptop supplies - a 90W one with multiple voltage switch, set to 15V, got a bit toasty, but not alarmingly. Battery seemed fine. I didn't watch it all the way, but eventually it got to the terminal voltage (though I could have set it a bit higher to squeeze in a bit more I think) and the BMS actually shut off the charge. Occasionally popping "on" again, taking the CC setting of 2A for a short burst. Eventually I disconnected.Yesterday and a little more today I took a bit of charge from the battery testing my home-brew UPS I'm creating ... which will be for an average 20W load or so ... maybe 1.5A ish at the battery. With peaks up to maybe 3x that. A Pi4 used for Pi-KVM, an Ezcoo HDMI 4-way switching controlled by the Pi, an 8-port 1gbe network switch, and a Gi-Net Spitz LTE router with handy SMS API. Still developing the microcontroller based "master" agent to take advantage of sleep states etc. for extended black-outs. Then there are more of the buck-boosts (being careful to tie output ground to input ground for the ones used with CV for step-down, plus I throw in a few Zener's to avoid emf accidents or some ESD, and selected capacitors to reduce noise). I have to import decent Y-Ideal-Diodes from Mini-Box in the States - the basic principle of the UPS function.I've been looking for cheaper batteries that seem reliable, that I can use in other UPS's I intend to make for my Intel Nucs etc. Where I want the longer run time.Even using this mostly at 50% capacity, to reduce cell damage, ... I should be able to charge to 100% every week, use a logic gate on the Y-Ideal-Diode to use the battery deliberately to discharge to 50% (or occasionally to nearly empty when the discharge curve finally gives in, to calibrate) then I'd hope for a few hours run time for my use case ... and I'd hope my battery might achieve a calendar life of maybe 15 years, with no manual maintenance. Maybe longer. Adjusting the "50%" fractional charging to higher fractions as the cells degrade, when using 50% has diminishing return value over extended life-times. But that achievable calendar life does rather depend also on the BMS components, and the manufacturing quality of the cells etc. Whether this cheap battery can achieve this ideal, I don't know, but so far, I'm impressed!So today, knowing it didn't have 100% charge but assuming the BMS should have evened out the cell charges, I hooked it up to a programmable load I have (also bought from Amazon) that has bluetooth connectivity so I could keep an eye on the discharge on my phone.I set the programmable load to 1A CC, and set the cut off at 12V. (The BMS has a 10V cut off I think).The specs suggest a capacity of 102Wh or something like that I think.Remember: I didn't start-off at 100%, and I cut-off the discharge early at 12V. But basically it took over 7-hours at 1A ... over the stated 7.2Ah, settling early at about 13V, staying at 13V for over half the discharge, and then slowly drooping until the programmable load shut off at the appointed 12V. Rebounding a little after load-cut-off. I read 94Wh. If I'd started at 100%, and let it go down to 10V, I would not be surprised if it reached the stated 102Wh.I have high hopes. :)

Wanted to test out a small solar setup and needed a battery, this was the cheapest per AhCoupled this with a 10a pwm controller and a 50watt solar panelUsed SAE connectors and battery clips to connect everything up, battery first then solar panelEverything worked first time.As I had seen some people report problems with batteries arriving dead I tested the battery voltage to see was set to about 13volts.Battery is very small, so just check the size listed as it's a lot smaller than I expected but that is fine.The battery itself looks to be in good condition, no bowing of the case but does feel thin, then again this is a real small battery, the positive and negative connections are shown by the colours only, no plus minus symbols but not a problem.Has been working fine for a few weeks so decided to get another one of these as the solar panel should charge the battery in about 1 day and using it to charge other devices through either the usb on the charge controller or a car power socket on the output power line of the pwm. Both work fine to charge my usb or DC powered devices.Second battery arrived in same condition and similar voltage as the first, 13 volts.Connected the second battery in parallel as that appeared to be the preferred way to connect (12v with 14.4ah total), although from what I can see connecting more than a couple of these is not recommended. Connected them together with some crimp terminal connectors, not sure of size but they are blue sleeved (7.4mm width), those connect to the batteries to give a snug fit. Working fine for over a week now with no problems. So happy with my small solar set up, able to charge battery packs up and have all the power I need for my devices. Both batteries appear to charge fully up with the setup.Overall happy with these for at least doing a test setup but looks like will have been worth getting and will my setup will last longer than expected.

So it's just arrived and my first impressions aren't great but aren't awful eitherThe case itself was badly sealed with the lid being loose, not a big deal as it allowed me to check the installed BMS... Not the best quality of installation but hey it will do for the price.I also took the opportunity to measure the cell voltages being aware that a LiFePo4 cell with a nominal 3.3v should never be below 2.5v and should be 3.6 when fully charged.For optimal long term storage they should be somewhere between these ideally close to the nominal 3.3v (or 12.4v for the whole pack) unfortunately these came with the cells completely discharged and a pack voltage of barely 10v with the cells ranging from 2.47-2.53vi am currently charging this pack with a CV/CC and will see how well the BMS copes with balancing.Will update this review when I know more[update]Well after slowly ramping the voltage up at low current until the pack was within normal working limits I managed to get a full charge from it without too much difficulty. Final review of the ballance voltages showed all cells within 0.05v so perfectly acceptable as far as ballance goes.[update 2]well after a bit of use for portable amateur radio work I can say this performs well for the price. I recently did a full capacity test on this and measured 5.9AH which while below the 7.2AH specified isn't too bad overall (Measured from BMS cut off until full charge) especially given that the headline capacity includes squeezing every last electron out of the cell... so i would say 7.2AH absolute max, 6AH usable

Well, I got it as an experiment. It arrived when expected and was smaller and lighter than expected - GOOD, roughly 1/4 the size of my old equivalent lead acid unit, a lot lighter. When first tested it was at 13.1 Volts which I was happy with. I connected it up to a small solar panel outputting up to 20V but only a little current. After a few hours it's charged, the voltage is now at 14.1Volts and the unit has stopped charging, I now see the solar voltage over the unit and not the internal battery voltage so the internal battery management works. So in the future, a charge controller arrives, and maybe more amp hours in a bigger unit. A good small unit for the planned power cuts will easily do 12V lights.

I've read lots of reviews stating these batteries turn up completely empty, wont charge and are swollen. These are Li-Fe metal cells so don't swell, the case is just cheap plastic and slightly bows out and the battery I received was also reading 0v, this is however because the BMS has kicked in to protect the batteries and at this point you need a dumb car battery charger to get the BMS to engage the battery again.I can confirm that my battery took a full 8ah of charge and works perfectly, Li-Fe batteries are not anywhere near as dangerous as standard lithium batteries, so treat it like a car battery and you'll have no issues. It shouldn't however turn up reading 0v and this is why I've not given it 5 stars.

Easy and hassle free. Holds power well, charges easily, small, light and sturdy.

I bought this battery to work with my garden shed's solar panel system (as shown in ad page), and it worked well for the first couple of days. However, last night I charged two power banks and kept a light on, and when I awoke the battery was completely depleted - I now need to charge it by hand before I can reconnect it to the solar array. Does work though with a solar charger which is apparently for lead acid battery, and charged quite well until last night's overuse. After I've charged it at home I'll return it to the shed for another try - now have a better understanding of it's night-time capacity.

I bought this as the lead acid battery that comes supplied with the MPA 40 had failed. As a warning please note if your present battery is needing a more frequent recharge and only lasting 3 hours change it! I was extremely fortunate to have done a wedding and get through the ceremony, the battery failed the following day. It went from fully charged to zero in 10 mins with no sound going through it ie on idle. Back to this product. I checked dimensions and thought it worth a try. It fits perfectly and is still after some four weeks of light use so around twelve hours at 100% charge. The capacity of this is near double of the original and the unit sounds better. Tighter bass and clearer. Now I’m not saying it’s louder as I’ve not measured it but at the levels I have always used it does sound punchier. If this is your problem too, I thoroughly recommend it as a replacement. I might write another report when it discharges. As yet I am not sure whether the leds will function in the same way with a replacement power unit. So far so good.