ONYX OHM Charger

Real-Time Charge Status: YES
Real-World Charge Status: YES
PCB/PCM Cell Compatible: YES
Low-Voltage Preconditioning: YES
USB IPR System: YES (100% Autonomous)
Charge Rate: 2A combined (1A each slot)
Battery Size Compatibility: 34 – 73mm
Compatible Chemistry:  Li-ion (3.6V / 3.7V)

Love the simplicity of Hohm SCHOOL series chargers?   Then here is the candy of chargers.  ONYX OHM is utilizing the same speedy output power of Hohm SCHOOL 2 (2A combined) but is equipped with the upgraded USB-C input.

It doesn’t stop there.  A Matrix I/O screen with a light-bleed shield is on board so it is clearly visible from multiple angles.  We’re just warming up here…

The ONYX OHM charging system is directly influenced by BEV (Battery Electric Vehicles).  How so you may ask.  Let’s list a few here: 1) the displayed SoC (State of Charge) is based on Real-time & Real-world charge % like today’s EV (Electric Vehicles);  2) Omits stratagem data from displaying;  3) Integration of imperative safety features including low-voltage preconditioning, DC overload, overcharge prevention, reverse polarity, cell fault detection, short-circuit prevention, and fire incubation.

There’s more.  The ONYX OHM is equipped with an HPSC microcomputer with a 4.2V automated voltage (V) detection circuit.  Sounds cool, but not as cool as the efficient PWM control technology making CC & CV promote an extra layer of reliable charging.

Last but not least, the ONYX OHM uses >71mm slots to ensure it charges most everyone’s cells without fitment issues.

Every Hohm Tech product is tested and certified by the rightful authorities/laboratories and accredited entities to achieve Compliance & Certification of: CE, ROHS, FCC, Air/Sea Transport, and is backed by Industry Leading PLI.  We do not cut corners. We deliver what we promise… chart-topping performance, capacity, and safety.

WARNING: Educate yourself on your battery & charger’s proper uses and handling.  There are warnings and safety information to ensure they are used properly and within their capabilities.


Consult a certified lithium-ion specialist or certified battery pack assembler if there are any uncertainties or questions on the use of, handling of, installation of, charging of, or storage of lithium-ion batteries. Consumer safety is of utmost importance.

1 Slot

Hohm SCHOOLUNO Single  2A Micro-USB Charger

  • 2A | 10W TURBOCHARGED

  • Plug & Play ready out the box.  Connect to your preferred USB 5V Power Adapter and it’s ready to work

  • Built from Fire-Retardant materials adds to the list of safety features

  • Unilateral design derived directly from the high-quality SCHOOL charger lineup

  • Long-throw sliders allow cells up to 71mm length

  • Simplistic LED system.  RED = charging; GREEN = charged

  • Optimal contact with the top portion of the cell with its Multi-Groove positive post

  • Has the safety features one would expect from Hohm Tech.  Enabled with:  1. PCB Overheat Prevention;  2. Short-Circuit Prevention;  3. Reverse-Polarity Prevention;  4. Over-Charge Prevention

  • Li-ion sizes: 26650, 22650, 21700, 20700, 18650, 18490, 18350, 17500, 16430 (RCR123), and more

  • Charging with proven CC & CV (constant current & constant voltage)

  • Just like its bigger siblings, it utilizes the integrated IPR System.  IPR= Input Power Regulator.  This enables the charger to withdrawal demanding high power from underpowered USB Power Adapters

  • Designed specifically for protected and non-protection 3.6v/3.7v Li-ion (lithium-ion) cells

  • Big-Bore Slot to secure both small & large Li-ion cylinders (easily handles 26650 girths)

2 Slot

Hohm SCHOOL2 2A BLD Micro-USB Charger

  • THE SMARTER CHARGER…

  • 100% Autonomous. Battery Length Detection (BLD) System + Input Power Regulator. Now there is NO NEED FOR A SCREEN…it does everything including automated amp output automation. No more settings to figure out

  • The BLD System built directly into charger enables it to automatically jump amperage up or down dependent on cell length

  • Input Power Regulator integrated directly into unit…no more stressing USB power adapters or ports

  • 0V Activation enabled @ 0.5A (yes, it’ll charge batteries you thought were dead forever)

  • Solid and Pulsing LED indicators for fast/easy reading

  • PCB/PCM equipped li-ion batteries…NO PROBLEM.  Let’s charge ’em

  • Non ABS fire-retardant compound

  • Multi-Groove positive contact for optimal energy flow

  • Microprocessor controlled. Easily handle 2A combined charge rate

  • Has all the standard protection features one would expect: Reverse polarity; Wrong battery type; Over charge; Short circuit

  • Literally plug into any USB port, it’ll handle the rest from there

4 Slot

Hohm SCHOOL4 4A BLD USB-C Charger

  • MAKES OTHER CHARGERS LOOK STUPID

  • Based on the Hohm SCHOOL platform, but now with 2x BLD (Battery Length Detection) Systems + updated IPR (Input Power Regulator) program. There is NO NEED FOR A SCREEN…it does everything including automated amp output automation. Making life easier one charge at a time

  • The BLD system is built directly into charger, which enables it to automatically stop up/down the amperage charge rate dependent on cell length

  • Input Power Regulator integrated directly into unit…no more stressing USB power adapters or ports

  • 2V Activation enabled @ 0.2A (it’ll charge batteries you thought were dead forever)

  • Solid and Pulsing LED indicators for fast/easy reading

  • PCB/PCM equipped li-ion batteries…NO PROBLEM.  Running identical system as its baby brother Hohm SCHOOL 2

  • Non ABS fire-retardant compound

  • Multi-Groove positive contact for optimal energy flow

  • Microprocessor controlled. Easily handle 4A combined charge rate with its USB-C connectivity

  • Has all the standard protection features one would expect: Reverse polarity; Wrong battery type; Over charge; Short circuit

  • Literally plug into any 5V USB port, it’ll handle the rest from there