— 18650 High Drain
CAPACITY AND CURRENT, WITHOUT COMPROMISE
A 4200mAh 18650 that still delivers 12.6A continuous. The pick when a slim pack has to run both long and hard.
— Where it works
WHAT THIS CELL IS GOOD FOR
Each scene states the case for this cell and, just as plainly, the case against it. Knowing which cell not to buy is the point.
Slim packs that need real run time
Of the 18650 cells Monachi stocks, this one carries the most energy in the smallest footprint — and at 296 Wh/kg it is the densest 18650 in the range. It suits handheld devices where the enclosure is fixed at 18mm and changing the pack shape is not an option.
Where it does not fit
Do not size a pack around the 4200mAh rating at 12.6A. High continuous current reduces usable capacity — confirm the real duty cycle with Monachi before you commit to a run-time target.
Continuous current without a second cell
A 3C continuous rating means one cell can feed a load that would otherwise need two parallel 18650s at full rate. That is fewer cells, less spot-welding, and a simpler BMS. If the load is lighter, 21A is available as a pulse.
Where it does not fit
12.6A is the continuous ceiling, not a working average. Sustained operation above that is outside the datasheet window, whatever the pulse figure allows.
Devices that get charged often
With a 1C charge rate the cell refills in a little over an hour, which suits gear that is topped up daily rather than cycled to empty.
Where it does not fit
Cycle life is quoted at 300–500 cycles. If the pack is deep-cycled every day, this is a comfort decision, not a longevity one.
— The numbers that matter
INR18650-42D · 4200mAh
Capacity
Energy stored per cell. Multiplied across the pack, this is your run time.
Standard discharge
The current this cell can hold continuously. Match it to your load before anything else.
Pulse discharge
A short burst — motor start, takeoff, inrush. Not a sustained figure.
Cycle life
Charge/discharge cycles before capacity falls to the end-of-life threshold, at gentle duty.
Remaining ratings
- Nominal voltage
- 3.6V
- Max charge
- 4.2V
- Charge current
- 4.2A (1C)
- Energy
- 15.12Wh
- Energy density
- 296 Wh/kg
- Weight
- ≤51 g
Figures reflect NCM 18650 · High Drain manufacturer specifications. Duty cycle, thermal management, and pack design all move the real numbers — confirm your intended load with Monachi before committing to a target.
— Compare the family
CLOSE CALLS IN 18650 HIGH DRAIN
— Order this cell
INR18650-42D
4200mAh · NCM 18650 · High Drain
Add this cell to your cart, or send the selection straight to our sales team on Telegram. Prices shown are indicative starting prices — final B2B pricing, availability, and terms are confirmed by Monachi.
Indicative pricing (USD)
Not a final offer. Freight, duties, and payment terms are quoted per order — confirm with Monachi before you plan against these numbers.
3-month warranty on every cell. Defective cells are replaced.