18650 Li-ion Rechargeable Battery 3.7 V
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Prices updated: 13 Oct 2026
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About this product
A cylindrical 18650 lithium-ion rechargeable cell rated at 3.7 V, intended for portable devices and projects that need high energy density and low weight. Cells can be connected in series for higher voltage or in parallel for higher current, but they must be used with a charger and protection circuit designed for Li-ion cells.
Specifications
- Chemistry
- Lithium-ion (Li-ion)
- Format
- 18650 cylindrical
- Nominal voltage
- 3.7 V
Frequently asked questions
What is the capacity of this cell?
The listing gives conflicting capacity figures: the title says 2200 mAh and the specifications say 6800 mAh. Verify the capacity printed on the cell label before designing your power budget.
Does it need a protection circuit?
Yes. Li-ion cells should be charged with a Li-ion charger and protected against overcharge, over-discharge and short circuit. A protection board (BMS) or a protected charger module is strongly recommended, especially when cells are connected in series or parallel.
