Rechargeable Li-ion · 3.6 V
18650equivalents
The 18650 is also sold as INR18650 and ICR18650. They are the same cell under different brand and standard names, so any of them fits.
Same battery, other names
- INR18650
- ICR18650
Size and specs
- Voltage
- 3.6 V
- Size
- 18.4 × 65 mm
- Chemistry
- Lithium-ion. INR is a lithium manganese nickel cell built for high current; ICR is lithium cobalt, which holds more but can't deliver as much.
- Capacity
- about 2,000 to 3,500 mAh
- Type
- Rechargeable Li-ion
18650 vs AA
Batteries people mix up with the 18650. Close, but not the same.
| Battery | Size, voltage | Difference |
|---|---|---|
| 18650 | 18.4 × 65 mm3.6 V | This page. |
| AA | 14.5 × 50.5 mm1.5 V | Smaller, and 1.5 V. An 18650 does not go in AA devices. |
Good to know
- The name is the size: 18 mm wide, 65 mm long, 0 for a cylinder.
- Protected cells have a small circuit at one end and are a few millimetres longer. Some flashlights need button-top or protected cells, so check before you buy.
- Match the cell to what the device draws. A flashlight or vape needs a high-drain INR cell. Buy from a known brand; fake 18650s with inflated mAh ratings are common.
- Store spare cells in a case, never loose in a pocket with keys or coins, and at about half charge if they'll sit for months.
Questions
What is the equivalent of an 18650 battery?
The 18650 is also sold as INR18650 and ICR18650. They are the same cell under different brand and standard names, so any of them fits.
What size is an 18650 battery?
18.4 × 65 mm, 3.6 V. Lithium-ion. INR is a lithium manganese nickel cell built for high current; ICR is lithium cobalt, which holds more but can't deliver as much.
Battery Inventory for iPhone and iPad
Never look up the 18650 again.
Battery Inventory remembers which battery every device in your home takes, reminds you when one is due, and counts the spares in your drawer, so you buy the right cell before the old one dies. The finder in the app knows every code on this page. Search any of them, or point the camera at a coin cell to read it.
- Battery change reminders, free
- Monthly smoke and CO alarm test reminders
- A spares drawer and shopping list
- Cordless tool packs and chargers too
No account needed. Smoke and CO alarm features are reminders only: the app can't see or test your alarms.
