NEXPEAK NC215 15-Amp Battery Charger, Trickle Charger Car Battery Charger 12V 24V LiFePO4 Lead Acid Portable 9-Stage Smart Battery Maintainer w/Temp Compensation for Car Truck Lawn Mower Boat Marine

I've been turning wrenches for 65 years. Came of age with all kinds of "dumb" chargers of different voltage and amperage ratings. Further, I'm very well versed in electrical and electronic matters. The classic Schauer 2/10/50 amp, 6 or 12 volt charger. Also, of late, one of those not dumb, not smart chargers that display a percentage of charge on an analog meter and need some kind of voltage to kick it into gear. No good for powering 12V devices. See Harbor Fraught Cen-Tech. I got a new AGM battery for my car. It wasn't fully charged, so I put that Cen-Tech on and switched to AGM. Over the next several hours it went from something low to full and back and forth over and over. I finally took it off and measured the voltage after turning the headlamps on for 30 seconds. I don't recall the voltage, but it was only perhaps 80% of full. IF YOU DON'T KNOW THIS, YOU NEED TO: There's an excellent way of finding out a car battery's health by charging it, and then getting rid of what's called the "surface charge." Turn the lights on for a minute, or let it sit overnight. Measure the open circuit voltage. There are many charts on the intertubes that list voltage by tenths and the corresponding percentage of new it is. These are available for both regular flooded lead acid and AGM's. For instance in flooded batteries, 12.7V would be 100% good, 12.46V would be 80%, 12.2V 2 would be 50%, etc. AGM's have a higher voltage for the same percentage. Since my Cen-Tech was not doing things right, I perused all the charger options on here. The first thing that struck me was that the old dumb chargers were gone. The new generation fully smart, solid state, ones were capable of amazing things. No, no more 50 amp starter boost, but a lot of functions that claim to repair old sulphated batteries. I chose this particular unit because it had a 15A maximum capacities, most others at around $30 were only ten amps. Go for the gold, right?I was astounded how small it was, being the old school charger relic that I am. I hooked it up to my new AGM using the LiFePO setting. Their needs are the same. Charged it to 100%.Then I put it on the old battery that had a 25% capacity per the overnight voltage. It immediately went into "DE5" desulpherization mode, then proceed to do a charge. After ridding it of the surface charge, I got....12.7 volts. ":New" I then put another battery on it, a couple of years old, still in service. Same thing. Wowsers!After that, the voltage was 12.7. Like new. I had the same result on a third battery that was not as old as the first.I then went to "Repair," which uses that pulse current voodoo black magic. It did its thing for about 45 minutes per battery. It works. If I had bought and used this $30 charger on the old battery, I would not have spent $150 on a new one.Hearing of my results, my brother bought the same unit.

I really like this charger. Bought it to charge my Lifepo4 12v 100ah.I like the touch screen and how the charger cycle through the charging info. I would recommend this. Unless I update this review since this is day 2 of having it and already charged 2 batteries.By the way the fan kinda loud but it doesn't bother me. One thing to mention that I wish it has on/off switch so you don't need to disconnect from power each time you need to charge your Lifepo4 batteries.

The charging cables are NOT 6.7' as stated in the ad graphic. Actual length is 2'.Maybe they mean length from plug to clips, but it's REALLY deceiving and was a pretty major influence on my purchase decision.Very disappointed by this, but hey, it's Amazon a.k.a. the wild west of commerce.

This is a great battery charger, price is good too. The auto voltage works, but there are 2 caveats for those charging Lifepo4 battery:1. You cannot lock the voltage, my 24v battery drained with inverter connected to it and the charger thinks the battery is 12volts so it would not charge until I disconnnected the inverter.2. The charger only charges until the battery is full, but it would not charge the battery again even when it’s drained unless it’s disconnected and reconnected again (or unplugged and replugged). I resolved this issue by inserting a smart plug and every 12 hours I turn it off and on. I wish the charger would monitor the battery voltage and auto charge when needed.

So far it's a great charger for my 100AH Lifepo4 battery. my previous one was a little weak for a LifePo4 . This one is perfect

Love how easy it is to use. Great charger for the price. The touch screen is nice too. Compact size and lightweight.

great little charger at a fair price

I was a little concerned when I took this out of the box. It is pretty small and really light weight. My wife said it looks and feels like a toy, and I agree. That being said, it actually did a fantastic job charging our 200-ah LifePO4 battery. It did get a little hot, but it was able to completely charge the battery.