CR123A battery size
17 × 34.5 mm
3 V · Lithium · Cylindrical · also sold as CR17345, 16340 (rechargeable)
About the CR123A
A 3 V lithium cylinder used in film cameras, tactical torches and some security sensors. Its rechargeable lookalike, the 16340, is 3.7 V — putting one in a device designed for CR123A is the usual cause of a torch that runs bright and then dies.
The numbers
| Diameter | 17 mm · 0.67 in |
| Height | 34.5 mm · 1.36 in |
| Nominal voltage | 3 V |
| Chemistry | Lithium |
| Other names | CR17345, 16340 (rechargeable) |
Other cylindrical sizes
| Cell | Size | Voltage |
|---|---|---|
| AAA | 10.5 × 44.5 mm | 1.5 V |
| AA | 14.5 × 50.5 mm | 1.5 V |
| C | 26.2 × 50 mm | 1.5 V |
| D | 34.2 × 61.5 mm | 1.5 V |
| AAAA | 8.3 × 42.5 mm | 1.5 V |
| N | 12 × 30.2 mm | 1.5 V |
| A23 | 10.3 × 28.5 mm | 12 V |
| 18650 | 18 × 65 mm | 3.7 V |
| 21700 | 21 × 70 mm | 3.7 V |
Frequently asked questions
What size is a CR123A battery?
17 mm across and 34.5 mm long — 0.67 × 1.36 inches.
What voltage is a CR123A?
3 V (Lithium).
What is another name for a CR123A?
CR17345, 16340 (rechargeable) — all the same cell.
Is the CR123A rechargeable?
Not in this chemistry. Lithium cells of this size are single-use; recharging one is a fire risk rather than a saving.