Samsung INR21700-30T - The undisputed high-current king (3000 mAh)

The Samsung INR21700-30T (short "Samsung 30T") is a legend among lithium-ion cells. It utilises the modern 21700 format (slightly thicker and longer than the classic 18650 cell) and is uncompromisingly designed for maximum performance. With a constant discharge rate of 35 ampere (and with temperature monitoring, even significantly more), this is the cell of choice when you absolutely do not want to compromise on power. It is extremely popular worldwide among users of mechanical e-cigarettes ("mech mods") and extremely high-performance torches, as the voltage hardly drops at all, even under brutal load.

Highlights at a glance

• Extreme current load capacity (High Drain): The 30T delivers continuous 35 ampere. This is an immense value that easily powers even the most demanding motors or heating coils. It is considered one of the "toughest" cells on the market (minimal voltage drop).
• Hard Hitting Performance: While other batteries drop the voltage under heavy load (the device seems "tired"), the 30T keeps the voltage up. The result: motors spin faster, lamps shine brighter, vapour is more intense.
• 21700 Format: This cell is larger than a 18650 (21mm diameter vs. 18mm). It only fits in devices that are explicitly intended for 21700. This format is the new standard for high-performance electronics (e.g. in Tesla Model 3 battery packs or professional tools).
• 3000 mAh capacity: To enable this enormous performance, the cell sacrifices some capacity. 3000 mAh is solid, but less than models geared toward endurance (like the Samsung 50E with 5000 mAh). The focus here is purely on "power".
• Safe chemistry: Uses robust INR chemistry (lithium-nickel-manganese-cobalt), which is very thermally stable – a basic requirement for currents of this size.
• Unprotected industrial cell: This is a Flat-Top cell without integrated protection circuit (PCB). This is necessary to allow high currents to flow freely but requires expertise in use.

30T vs. 40T – Which is the right one?

Samsung offers two top models in this class: the 30T and the 40T.

• Samsung 40T (4000 mAh): The all-rounder. Offers more runtime, but under extreme loads (over 25-30A), the voltage drops a bit earlier.
• Samsung 30T (3000 mAh): The sprinter. Has less runtime, but still delivers relentless performance at 35A or 40A. Conclusion: If you need the absolute maximum power (e.g. for competitions, drag racing with RC cars, or mechanical vaping at the limit), choose the 30T. For everyday use, the 40T is often more practical.

Features

FAQs about the Samsung 30T

Will this battery fit in my 18650 charger?

Often not. The cell is 70 mm long and 21 mm thick. Many older chargers are too narrow or the slider doesn't go far enough. Check whether your charger is explicitly "21700 compatible". If the battery only goes in by force, you will damage the shrink sleeve (risk of short circuit!).

Can I use it in a torch?

Yes, if the torch is built for 21700s (e.g. Olight Seeker 2/3/4, Acebeam, Imalent). For torches with extreme turbo modes (5000+ lumens), the 30T is often the best choice to achieve maximum brightness. Please note, however, that the 30T is a Flat Top – some torches require button tops or magnets.

Is it safe for e-cigarettes (Mech Mods)?

Yes, it is the gold standard. There is hardly a safer cell for mechanical vaping. Even with coils at 0.10 Ohm, the 30T stays "cool" and delivers stable power.

What happens if I put it in an 18650 device?

It does not fit mechanically (too thick). Never try to insert it without a case or by force.