A "4 button charger" are those standard design of multi-type (Ni-XX, Li-XX) chargers that are everywhere now.
Ansmann xMove 2.0
Core UDC
iMax B6
Turnigy
Team Orion
etc
etc
...although in fairness, the Team Orion and Turnigy Im hearing good things about. The Turnigy has little variable resistors so you can fine tune the calibration so its exactly right. I gotta love that idea.
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