If I'm reading that correctly then only 1 charger failed on you, right? So you've got your replacement and its working properly? I think you probably just had a fluke because I've never had an issue with one of the Olight magnetic bases (I've had several, and an S30R II has lived on my bedside table for months now). Any manufacturer is going to have a certain amount of defective products. It happens, but I think you'll find the Olight to be very reliable from here on.
That said, I do also own a Nitecore D4 charger because I've got lots of other lights without built-in charging. The Nitecore chargers are very well respected. Another good option is Xtar. I recommend illumn.com for batteries/chargers.