E-FAST 10A Lifepo4 & Lead Acid Car Battery Charger | 12V/24V Smart Trickle Charger & Maintainer | Compatible with Truck, Motorcycle, AGM, Lawn Mower, Boat & Marine Batteries | Perfect for Winter Storage & Long-Term Battery Maintenance

I used this to charge my LiFePo4 12.8V 50Ah battery that i had just discharged to about 15% of capacity. I'm giving this 4 stars as a preliminary rating, if it's still working as well after five recharges I'll bump it to 5 stars. [UPDATE 5/26/24 to raise rating to 5 stars; the charger continues to work exactly as desired.] The user manual only gets 3 stars, though. The writing is decent, but it's just not very informative, particularly about LiFePo4 charging and what all those light are doing.The Charging:Plugged it in, tapped the mode button to set it to LiFePo4, and attached the clamps. The charger correctly identified the battery as 12V and chargeable, and got to work. About 6 hours later it turned itself off. Open-circuit voltage after 3 hours of rest is a comfy 13.4 volts, and most state of charge tables give that a 99%. What's not to like?The charger got only a little warm, and emitted no overheated electronics or baking plastic odors . Cables and connectors all stayed cool. The fan makes a pleasant hum. Some reviewers find the case to be kind of a little to plasticky, but it seems solid enough to me.Starting the charging was simple, but how to pause it was not described. I unplugged the AC cord, then detached the clamps.The Display:It's got a lot of lights! They blink and change colors! Some of them seem to be trying to communicate with you, but the message is a bit unclear.The metered values of voltage, amperage, and temperature are nice. Nicer would have been if they included watt hours pushed into the battery.The little "filling battery" animation is cute, but in my case it simply went up to 60% and then didn't budge for hours. During that time the voltage was sitting around 13.7V, which seemed too low. However when it finally made it to 80% things started to happen; the voltage started increasing to an eventual 14.4V and the amps slowly fell from 10 to 5. I suspect that the filling battery animation doesn't mean much for LiFePo4 charging, but that's fine because the charger seems to know what it's doing. When the voltage reached the max the charger turned itself off, and as I said the battery seems to be 99% charged.There's also a "wheel of lights" which is kind of annoying at first; I think it's meant to let you know which charging stages have been completed. It's probably useful for lead-acid charging.And finally there's the Mode Button. It stays brightly lit and cycles through colors for no discernable reason. I think along with the wheel of lights it may be trying to entertain silverfish and spiders.