Cylindrical batteries
Cylindrical cells cover both disposable household sizes and rechargeable lithium-ion cells used in packs.
All cylindricals
186503.6 V
Li-ion
18 × 65 mm
AA1.5 V
Alkaline
14.5 × 50.5 mm
AAA1.5 V
Alkaline
10.5 × 44.5 mm
C1.5 V
Alkaline
26.2 × 50 mm
D1.5 V
Alkaline
34.2 × 61.5 mm
AAAA1.5 V
Alkaline
8.3 × 42.5 mm
217003.6 V
Li-ion
21 × 70 mm
266503.6 V
Li-ion
26 × 65 mm
145003.6 V
Li-ion
14 × 50 mm
104403.6 V
Li-ion
10 × 44 mm
163403.6 V
Li-ion
16 × 34 mm
CR123A3 V
Lithium
17 × 34.5 mm
CR1233 V
Lithium
17 × 34.5 mm
CR23 V
Lithium
15.6 × 27 mm
Common sizes
Popular equivalents
INR18650Direct
Same cell, different code
NCR18650Direct
Same cell, different code
LR6Direct
Same cell, different code
MN1500Direct
Same cell, different code
AM3Direct
Same cell, different code
LR03Direct
Same cell, different code
MN2400Direct
Same cell, different code
AM4Direct
Same cell, different code
Common cylindrical comparisons
AA vs AAASame voltage, entirely different sizeAA vs CSame voltage, about three times the runtimeAA vs DSame 1.5 V, roughly six times the runtimeC vs DD for double the runtime, C where a D will not fitAA vs AAAANot interchangeable — the AAAA is a quarter of the cellAAA vs AAAAOne letter apart in the name, about half the cell14500 vs AASame shape, more than double the voltage — never swap them10440 vs AAAAAA-shaped, 3.6 V — not a substitute16340 vs CR123ASame slot, different voltage — check the device is rated for both18650 vs 2170021700 for capacity, 18650 where the tube is already cut for it18650 vs 2665026650 for capacity, but far fewer devices take one21700 vs 26650Similar capacity, different shape — fit decides it18650 vs 14500Same chemistry, entirely different size class18650 vs AADifferent size, different voltage, different jobCR123A vs 18650Many torches take either — two CR123A stack to an 18650's lengthCR123 vs CR123AThe same cell — CR123A is the current designationCR2 vs CR123ABoth 3 V lithium, but the CR2 is much the smaller cell