54.6V 4A Lithium Battery Charger for 48V E-Bike, Scooter, Motorcycle & Boat - Fast Charging XLR Connector - Compatible with Ezgo & Other 48V Li-ion Batteries - Perfect for Commuting, Outdoor Adventures & Marine Use

Full charger indicator light no longer comes on but it still charges full charge in 2 hoursTested the charging under a pure resistive load and the charger put out 48.9V at 4.07A. The cooling fan immediately turned on. It appears the heat sinks of the power transistors inside the case do their job adequately. These transistors are the workhorses of the unit and are usually the most likely components to fail if they aren't thermally managed properly. The transistors are mechanically clamped to the case with a little bit of thermal paste to help heat transfer.Under no load, the charger put out 54.7V, which is right at the "nominal" nameplate rating of the unit. Inside the case, the circuit board shows it is a WATE-240 which I interpret to be a 240 watt design. The unit is designed at 4A and 54.7V, which equates to 219 watts, so there appears to be some margin in the design. The individual components inside look OK. They aren't name brand parts, but this expected in a charger for this price. There is separation of the high voltage section (120V) from the low voltage section on the board, so that is good. I did not test the "smart" functions where the charger is supposed to switch between constant voltage, constant current and 'float' modes as a battery progresses through its charging cycle.I will use this unit to charge an ebike battery pack which has a built in battery management system (BMS). The BMS provides another level of safeguard to prevent overcharging, overcurrent and overvoltage issues. If you use this charger on 48V battery packs without a built in battery management system, you are relying on the charger's safeguards to prevent damage to the battery. As long as the charger's safety features work properly, it should work just fine.The charging ends and wire kept slipping out of the plug. Tape fixed it but it was really not what I expectedIt makes a spark every time I plug it into the battery [52v nominal]. I have to use a precharge resistor or an XT90 connector. [5w 10k ohms? electromotorsports.com]The best way to stop sparking is to plug the charger in to the outlet, and let it charge the capacitors inside it before plugging it to the battery pack; NO SPARK !Ride all the timeI would have given this 5 stars, but it had an issue. The XLR cables that I had laying around did not work with this unit. I just assumed it was pinned for normal XLR cables. Well read the instructions and make sure yours are pinned that way. I plugged the charger into my battery which had an XLR port, and the cable exploded in my hand. testing all ends with voltmeter, turns out they are not pinned the same. So i had to manually solder the wires to make them match up and then it worked as intended. it has been charging my 13s5p battery to 100% without issues. It has a float cycle that kicks on close to 95%. My battery has enough capacity to pull 100% of this unit, and its been running fine charging. Time will tell if it lasts. I have only charged my battery a handful of times.Solid charger, has 3 potentiometers on the inside for voltage, current, and fan wattage threshold(when to cut the fan on) theres a vortecks video on youtube that shows how to make this into a higher voltage charger with very very minimal tweaking. Make all of your bikes XLR with this thing. Board rating seems to be 200ish watts so you could do up to about 84v at 2 amps safely. This is a great ac to dc power supply and I may be buying another to cut down on transportation weight.One more thing, with external knobs and a power meter, you could turn this into a bench power supply. Check current limit and chips first however, id say 80v max at 2a or if you want, current limit max at 4a and 58.8 due to wire gauge.Be careful and monitor before tweaking.Bummer ,cant give a review cuz didnt work for me ,I have 48v 20ah battery, was hoping this would charge my battery faster than my old charger ,checked the fuses ,they seemed fine,light2 is supposed to turn red if its charging ,it remained greenWorks as advertised, very good.