Chris is correct, a cheap charger (particularly a no-name / offbrand) is always risky. CTEK makes good chargers. I have a CTEK MUS 4.3 and it works nicely (
link).
I also have several Pulse Tech Xtreme Chargers which are chargers / maintainers / desfulators, similar to most of the higher-end CTEK. One thing I like about the Xtreme Charge is that it will desulfate (pulse) during the charge cycle, where the CTEK will not begine to desulfate / pulse until several days after full charge is reached.
https://www.amazon.com/Pulsetech-Xtreme-Auto-Charger-Black/dp/B00BPF0Y64
YMMV, etc...
