Review on 🔌 High-performance 16.8V 2A Battery Charger - 30W AC/DC Power Wall Charge, Support 100V-240V Input Voltage, DC5.5 x 2.1 mm Connector, Ideal for 14.4V 14.8V 16.8V 4-String Lithium Battery Packs by Chris Pinkston

I bought six of these because they're half the price of (two) brand name chargers. I ran all eight chargers at least four hours a day for four months. Only one of those six burned down at the end of that time. Looking ahead to future updates, I currently don't think that twice the price of name brand chargers is justified by the failure rate of these half price chargers. All electrical devices have a lifespan that can only be described as average. At the moment, the average lifespan of these six chargers is good. By the way, please note (1) these are CHARGERS and not POWER SOURCES, which means that (2) they are specifically made to charge Li-Ion 4s 18650 3.7V batteries. Don't try to use them for any other purpose. If you don't know what I mean, don't buy this charger.