SC - Battery cell - 21700er - 4000 mAh battery

The SC battery cell 21700 is a high-drain lithium-ion cell with 4000 mAh, 3.7 V nominal voltage and up to 30 A discharge current. It has a flat positive terminal and no protection circuit of its own. A single cell is supplied.

Technical data

• Format: 21700, round, 70 mm long and 21 mm in diameter
• Capacity: 4000 mAh
• Nominal voltage: 3.7 V
• Maximum discharge current: 30 A
• Design: flat top, unprotected

Matching devices

The cell fits battery devices and devices with a 21700 mount. Before inserting, check that the discharge current of the cell matches your device's specification. A 18650 cell does not replace it.

How to use the cell

• Check the sleeve and terminals for damage.
• Insert the cell with the correct polarity.
• To charge, use an external charger with a Li-ion programme for 21700 cells.
• Store outside the device in a battery case.

Scope of delivery

• 1 × SC battery cell 21700, 4000 mAh, 3.7 V

You can find more cells of this format among the 21700 batteries, and the whole selection is under batteries.

Frequently asked questions

How does the 21700 differ from the 18650?

It is larger, with about 21 instead of 18 mm in diameter and about 70 instead of 65 mm in length. That is why it fits only devices with a 21700 mount.

Does the cell have a protection circuit?

No, retailers list it as an unprotected cell. The protection must come from the device or the charger.

Can I mix them with other cells?

In devices with several cells, it is best to insert identical cells of the same age and the same capacity.

How do I charge the cell?

Ideally in an external charger, otherwise in the battery device if it has a charging function. The charge cut-off voltage is 4.2 V.