Efest IMR18650V1 3500mAh
(8 reviews)
A high-drain 18650 cell from Efest: 3500mAh, 10A continuous and the reliability of a brand trusted by torch and vaping enthusiasts alike.
Characteristics
- Capacity / Voltage: 3500mAh / 3.6V-3.7V
- Continuous discharge: 10A (up to 20A pulse)
- Format: 18650 Flat Top, unprotected
- High-drain IMR cell, trusted Efest reliability
Detailed overview: Efest 18650 high-drain battery 3500mAh
The Efest IMR18650V1 is a lithium-ion battery in the 18650 format (18 x 65mm), built for high-drain use rather than sheer runtime. Its 3500mAh capacity and 10A continuous current (Efest rates this cell up to 20A pulse) make it a cell suited to powerful torches, mechanical or regulated vape mods, custom-built battery packs and power tools that call for sustained current.
We offer it here as an unprotected "Flat Top", with a flat positive terminal. This format, with precise dimensions of 18.25 x 65.25mm and a weight of 46.4g, remains the most widely compatible with cell holders and torches on the market. A protected "Button Top" version also exists at some retailers for devices that require it: it is worth checking the format your device expects before buying.
On the electrical side, the cell has a nominal voltage of 3.6 to 3.7V, a maximum charge voltage of 4.2V and a discharge cutoff voltage of about 2.5V. The IMR (lithium manganese) chemistry Efest uses in this line is known for thermal stability, an important point for a bare cell called on to deliver sustained current in a torch's turbo mode or a mechanical vape mod with no built-in protection circuit.
Efest is one of the most recognised names in the bare lithium cell community (torches, vaping, DIY), with a reputation for consistency from one cell to the next, essential once you start pairing multiple cells in series or parallel. As with any lithium cell lacking a protection circuit, some precautions are required: a charger dedicated to 3.7V cells (never a NiMH charger), avoiding loose carry in a pocket (a protective case prevents accidental short circuits), and keeping an eye on charging. For an experienced user, the IMR18650V1 is a reliable, readily available base for any high-drain 18650 application.
Our tester's review: Pierre Freysinger
We mostly knew Efest for its chargers, but the brand also holds its own among serious 18650 cells. Tested in a torch with a turbo mode and in a regulated vape mod, the IMR18650V1 holds its rated 3500mAh without a harsh voltage drop near the end of the charge, which is not a given at this price point. The 10A continuous rating comfortably covers the vast majority of torches and mods on the market, with the 20A pulse figure more of a safety margin than an everyday draw. One caveat: like any unprotected Flat Top cell, it will not fit torches that require a built-in protection circuit (Button Top format), worth checking before buying. Build quality feels consistent from one cell to the next, which matters as soon as you assemble several into a pack. For anyone comfortable handling a bare cell with the right precautions, it is a solid pick in high-drain 18650.
Frequently asked questions: Efest 18650 high-drain battery 3500mAh
The Flat Top has a flat positive terminal with no built-in protection circuit: more compact, it fits more cell holders and torches. The protected Button Top is slightly longer and required by some devices. Check the format your device expects before buying.
Only a charger designed for 3.7V lithium-ion cells in the 18650 format, never a NiMH battery charger. The cell charges to 4.2V maximum and should not be discharged below about 2.5V.
Yes, that is one of its common uses: its 10A continuous current (up to 20A pulse per Efest) covers the vast majority of mechanical and regulated mods on the market, provided you respect the cell's discharge limits.
It is not recommended: a bare cell with no protection circuit can short-circuit against keys or coins in a pocket. A dedicated protective case avoids this risk and extends the cell's life.
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Published on 05/09/2026