Outerman Car Battery Charger 12V 24V Lithium Battery Charger, Auto Battery Charger Maintainer for Car Boat Motorcycle Lawn Mower Lead Acid Battery or Lithium Battery Capacity: 6AH~105AH

One of the best battery chargers out there!

I bought this back in July of 2021. So this is a review for it After a few seasons of use. I use it mostly to charge 2 LiFePO4 20ah batteries on my RC Mower I built. Takes about 4-5 hours to charge my batteries up from about 10-15% charge to full. I know when the batteries are charged when it says 0.0 amps because the BMS modules in the batteries stop allowing any more power in. I normally have to set it to Manual mode to fully top off the batteries but it gets them to about 80-90% which is what you want to do to extend the battery life if your going to take it almost to 0% all the time.I had a few SLA batteries in some PC UPS battery backups I used it on to try and bring them back to life and it worked like a charm. Used it to revive an ATV battery a few times when one of my family members accidentally left the key on and the lights on for the ATV. Also used it to charge up some Deep Cycle AGM batteries on the RV.Used it to revive my old 69 Chevy's truck battery that sat dead for a little over a year. Granted I had to leave it on it for like 2 days but it did it... sadly the truck still doesn't run right but that's a different problem this little guy can't fix.Now, I've read though a bunch of the other reviews on here and other issues people have had. Honestly, never had any of those issues and its just worked great for me out of the box. So I can't say you won't get a lemon. Honestly, that's a possibility now a days on anything you buy with all the companies lowering their QC standards. But, if you need a charger give this little guy a try. Its been a good little workhorse for the farm and for the price its paid for its self.

Charger works very good

I recently installed a lithium battery in my antique Triumph motorcycle, and I wanted a charger which would properly charge it without damage. Standard chargers are designed with various cycles for lead-acid batteries and can damage lithium cells. This charger is lightweight and well-made, and has a switch to change the cycle for standard batteries to lithium cells. It also has a very bright display which provides important information about the battery and charging process. Since it works for both standard and lithium batteries, it is versatile and I am very pleased with it.

The cords are little shorter than I’d like but in terms of simplicity and effectiveness, it’s perfect.I haven’t used it for car charging, only for cast iron restoration, so that’s my experience with it.

I bought this in June 2021 but only got a chance to use it now, seven months later. I know…stupid.The instructions are an abomination. But it seems simple enough to use and there are really only two switches on the thing. I was charging a 12v car battery and so set it for automatic battery and ordinary charging. I connected the lead clips to the correct terminals and the screen lit up with 12.2v 00.0 amps. The fan did not go on and the charging light did not blink as the manual said they would. I waited a few minutes but nothing. Only the 12v light was lit. Nothing got warm. I disconnected the car’s leads from the battery and tried it the charger connected only to the battery itself. No difference. So I waited a few more minutes but there was no change.At this point, I tapped the top of the unit lightly and the charging light started flashing red and green. The screen now read 12.1v 7.2amps. After a minute or so, the light stopped flashing and so I tapped the unit again. It started flashing AND the fan went on. This happened two more times. The third time, the charging light stayed flashing for about 90 seconds and just as I thought it was ok, there was a loud POP and a flash of sparks out of the fan grill. I yanked the plug from the wall and disconnected it from the battery.Then I wrote this review.I’d avoid this product. You might get one that works. Or you might get one like mine. Now that I’m well out of the return window, I think I’ll try a different product

Due to COVID, I was hardly using my car anymore so after a month or so the battery would drain down to about 11.5 volts from lack of use. I already had an ancient 6 amp/2 amp charger/maintainer so I would use that to top up the battery to the required 12.6 volts. Unfortunately, that would literally take me 3 whole days to achieve and that ancient charger would get really hot trying to do its job. I needed something better.When I saw the Outerman MF-2B listed in Amazon, it appeared to be exactly what the doctor ordered. I purchased one and tried it out just yesterday. Amazing! It charged my battery right up to 13.0 volts in only 6 hours and when I checked the temperature of the case, it was only slightly warm. The built-in voltmeter is a handy option which allows you to keep tabs on the charging process. I compared the voltmeter on the unit with a laboratory Digital Volt Meter and they were within 0.1 volt of each other which is very good accuracy.To be honest, I had my doubts that something as small and light as the MF-2B could put out a full 10 amps, but now I'm a believer. After disconnecting the MF-2B and letting the battery rest for a couple of hours, the voltage settled down to the required 12.6 volts for a fully charged battery. The unit is so simple and convenient to use I can now charge my battery on regular schedule every 2 weeks or so. This is a great little unit. My only complaint is that the red and black wires tend to get tangled, but I solved that problem by taping them together and leaving just enough slack to attach the clips to the battery. That totally solved the problem. I'm tempted to buy another one for my grown son, but we'll leave that decision for Christmas.