Ultrafire 18650 Li-ion Rechargeable Battery 3.7V 5000mAh
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Prices updated: 13 Oct 2026
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About this product
A cylindrical 18650 lithium-ion rechargeable cell listed at 3.7 V nominal and 5000 mAh. It is intended for portable devices that need a compact, high energy density power source. Cells can be connected in series or parallel for higher voltage or current, which requires a suitable charger and protection circuit.
Specifications
- Chemistry
- Lithium-ion
- Nominal voltage
- 3.7 V
- Capacity
- 5000 mAh (as listed)
- Format
- 18650 cylindrical
- Rechargeable
- Yes
Frequently asked questions
What charger should I use for this cell?
Use a charger designed for single-cell Li-ion batteries, which stops charging at 4.2 V per cell. Chargers made for NiMH or other chemistries can damage a lithium-ion cell.
Can I connect several cells in series or parallel?
Yes, series connections add voltage and parallel connections add capacity. Cells should be matched, and a series pack needs a battery management system (BMS) to keep each cell within safe voltage limits.
