The Hohm Tech Hohm School 4A charger is based on the Hohm School platform, but now with 2x BLD (battery length detection system) + an updated IPR program (input power regulation). The screen is not needed,  it does everything, including automated automation of the output of the amplifier.

• Fits up to 71mm long cells 21700 with easeactually fits up to 73mm. Hohm is being conservative
• Safety features:
  • Overcharge
  • Short-circuit
  • Li-ion detection
  • Reverse polarity
• 2A total output 2 x 1A > 62mm batteries 2 x 0.5A for < 62mm batteries
• 0V Activation wake any Li-ion battery less than or equal to 0.5V
• LED indicators with warning notice
• Each slot is independent
• USB power operated >1A
• CE, FCC, ROHS certifications
• PCB/PCM battery compatible: YES
• 1 year warranty handled in U.S. & Canada