Miady 12V 16Ah Lithium LiFePO4 Deep Cycle Battery, 3000 Cycles Rechargeable Battery For Small UPS, Fish Finder, Power Wheels, Scooters, Solar-Power Built-in 16A BMS

So far, this has been an AWESOME drop in replacement battery for the Fishman LoudBox Mini Charge.For those that don’t know, LoudBox Mini Charge is an SLA battery powered acoustic instrument and microphone amplifier. Very versatile and great sounding mobile amplifier for busking, smaller venues or stage monitoring.Trouble is, the SLA 12V/5Ah OEM battery is not good quality. Brand new it barely delivered 2Ah usable power for the amp and after just 1 year capacity had dropped significantly. Enter year 2 of mild use the OEM battery now tests 0.05Ah capacity.Due to my involvement with eBikes, EV’s and some industrial battery bank installations I decided it might be time to retrofit this otherwise great portable amplifier using battery chemistry from this century. 3-4S Lipoly doesn't really deliver the voltages required without some circuit modifications but BMS protected 4S LiFePo4 does.Enter this little guy. This identically sized reasonably priced drop in LiFePo4 package saves about 2lbs and the Hi/Lo BMS voltage cutoffs appear to agree perfectly with the stock Fishman circuitry. Rated 12V/6Ah and very close to that using 0.1C discharge current. 3A or 0.5C still delivers about 5Ah which is at least double new SLA working capacity.I hope search engines will find this review. I don’t review much but this is one of those that a certain group of people may find very helpful when looking to replace the OEM battery used in Fishman LoudBox Mini Charge.Run time is now much much much longer than with new SLA and losing 2 lbs is always a great thing with music amps. Hopefully these cells are somewhat like the A123 LiFePo4 developer cells I've been using 15 years and still deliver 80% capacity. And that's 100's possibly 1000's of roughly 50% charge cycles.One last thing this is NOT a cranking battery. Do not buy it for electric start motorcycles or other high current applications. I believe the application description including motorcycles is meant for kickstart motos only.

I am a bit of a tinkerer. Bought two of these to use for various little projects around the house - i.e. testing solar panels and charge controllers, running various 110v items off power inverters, testing out vehicle lighting systems, etc. So far, they have taken everything I have thrown at them and performed like little champs.I ended up using them to build a solar battery bank for semi-off grid camping trips with my kids, and they keep our lights running, phones charged, and music playing all weekend with minimal solar recharging (read: in the woods under heavy cover).I have managed to run them almost completely down a few times. They've always recovered quickly, and still hold a charge exceptionally well. Last night, I used them to run a Craftsman shop light while working on a vehicle in my driveway for about 4 hours, and they performed beautifully.These batteries are very compact and lightweight, and they have been absolutely the perfect fit for my needs. However, I am now thinking I'll purchase a few more just to see how long I can run my little workshop on battery power alone.If you're looking to experiment with wind/solar power but don't want to risk blowing through expensive 200+Ah batteries, these are the perfect entry-level power storage, utilizing the latest in battery tech at a really affordable price.10/10 will buy again and recommend to friends

So I previously trashed this product in a similar way to the other 1 star review due to my lack of knowledge on how these batteries work. These batteries have internal battery management systems (BMS) which cutoff the current at 10V and cause the batteries to read 0V. I was under the impression this was either a "recommended cutoff" on the datasheet or the BMS would cut the current and then restart a moment later like many other BMS's do. When looking online, many people stated the drop to 0V was part of the protection circuit and was permanent: This isn't true!These batteries are designed to go into a sleep mode when they reach 10V and will wake up when voltage is applied from a charger. This is actually an incredibly useful feature for my application of using these as a portable power bank for heated motorcycle gear. I no longer need to worry about over discharge. I can just let the internal cutoff activate if the cells get too low (obviously this isn't preferred, but will work in a pinch if I run the batteries longer than normal).Now here's the issue: The charger I'm using, which is a smart charger for sealed lead acid (SLA) and Li Ion batteries used in cars, needs to detect the voltage coming from the battery to turn on charging. As a result, it does not send out any voltage of its own and will not wake up a sleeping battery. To turn the batteries back on, I VERY quickly tapped a 9v battery across the terminals of the battery (another 12v battery would have been better), positive to positive and negative to negative. This supplied the needed voltage to wake up the BMS and allow the 11.2 or so volts remaining to be present on the terminals once again. Now my smart charger could detect the battery and charge it like normal.Yes, the battery had 11.2V when the cutoff is 10V. This is not a defect in the BMS, rather, the voltage will sag under load to 10V, the cutoff will activate, and when the battery is woken up it will once again read the non-sagging "open circuit" voltage as there is no load any more.Overall I'm very happy with the 3 batteries I bought which arrived with identical voltages, perfect for parallel configurations. They have more power than I was expecting and should easily run my heated gear for 2+ hours on max heat. Being able the use a standard SLA charger and having an automatic low voltage cutoff makes these a versatile power source for many projects. Just make sure you have a way to "wake up" a battery that has reached the low voltage cutoff; either another battery or a non-smart charger.Here's the result of my discharge test for those who are curious about how much power these have. I'm using 3 batteries in parallel for roughly 18Ah of capacity (Series configurations are not recommended without a BMS, and even then, these batteries have internal BMS's so most people wouldn't recommend series configurations at all. I'll leave you to decide if you want to run series or not). I was powering a heated vest which consumes 5 amps at max heat and has 5 power settings. You can very roughly estimate that each power setting draws 1 amp (setting 1 is 1 amp, setting 2 is 2 amps, etc.), but the actual current draw is likely higher based on my testing. Here's the results:Heat 1 for 1.5 hoursHeat 2 for 3 hoursHeat 4 for 2 hoursAt this point the low voltage cutoff activated around 6.5 hours after I started running the heater! Obviously this isn't even remotely scientific as I used different settings and the only power setting that I can check the current draw accurately on is setting 5 which draws 5 amps (other settings use PWM so my cheap multi-meter is pretty useless). I'm pretty happy with these results and this pack should power my gear for a few hours with medium heat settings.*****Old Review: I used these batteries to build a large battery pack (wired three in parallel). They charged up just fine, but near the end of their first discharge (powering a heated motorcycle vest on medium heat, about 3 amps) all three cells dropped to 0.1 volts and ceased functioning. At my last voltage check (about 15 minutes before failure) the cells read 12.1 volts, well above the 10 volt discharge cutoff. Because the load was spread over the batteries, I had roughly 1 amp on each battery, which is within the 1.2 amp standard discharge rating on the datasheet. These batteries are rated for a continuous discharge of 6 amps each which I never hit in my testing. Really disappointed in these batteries.