Button and Coin Battery Size Chart.

Sometimes the number on a watch (button) or coin type battery is not very well stamped and impossible to read.
This page is a chart of the sizes to assist you to find the correct battery from just the measurements.

The table is laid out in ascending diameter × thickness.
All measurements are in mm and specifications generally allow up to ±0.5 mm tolerance, although some manufacturers can't seem to keep within ±1 mm!

How to use:

Measure the diameter and thickness of your battery.
If your battery is stepped (wide at one end then thinner for the remainder) measure at the widest point.
Look at the table and locate the size you noted in step 1 (allowing for tolerance), voltage and chemistry are also noted.
Click on that size (or volt/chemistry if 2 types are shown for that size) to go to the corresponding Battery Details page for full information.
Where there are 2 types the same size and the correct type is unknown check both details pages to ascertain correct type.

4.8 mm Diameter × Thickness:
1.65 mm 1.5 V Alkaline or Silver Oxide.	2.15 mm 1.5 V Alkaline or Silver Oxide.
5.8 mm Diameter × Thickness:
1.2 mm 1.5 V Alkaline or Silver Oxide. 2 V Lithium.	1.6 mm 1.5 V Alkaline or Silver Oxide.	2.1 mm 1.5 V Alkaline or Silver Oxide. 1.35 V Zinc Air.	2.7 mm 1.5 V Alkaline or Silver Oxide.	3.6 mm 1.35 V Zinc Air.
6.8 mm Diameter × Thickness:
1 mm 1.5 V Alkaline or Silver Oxide. 2 V Lithium.	1.4 mm 1.5 V Alkaline or Silver Oxide.	1.65 mm 1.5 V Alkaline or Silver Oxide.	2.1 mm 1.5 V Alkaline or Silver Oxide.	2.6 mm 1.5 V Alkaline or Silver Oxide.
7.9 mm Diameter × Thickness:
1 mm 2 V Lithium.	1.2 mm 1.5 V Alkaline or Silver Oxide.	1.4 mm 1.5 V Alkaline or Silver Oxide.	1.6 mm 1.5 V Alkaline or Silver Oxide.	2.1 mm 1.5 V Alkaline or Silver Oxide.	2.6 mm 1.5 V Alkaline or Silver Oxide.	3.1 mm 1.5 V Alkaline or Silver Oxide.	3.6 mm 1.5 V Alkaline or Silver Oxide. 1.35 V Zinc Air.	5.4 mm 1.5 V Alkaline or Silver Oxide. 1.35 V Zinc Air.
5.8 mm Diameter × Thickness:
3.3 mm 1.5 V Alkaline or Silver Oxide.
9.5 mm Diameter × Thickness:
1.6 mm 1.5 V Alkaline or Silver Oxide.	2.1 mm 1.5 V Alkaline or Silver Oxide.	2.6 mm 1.5 V Alkaline or Silver Oxide.	2.7 mm 3 V Lithium.	3.1 mm 1.5 V Alkaline or Silver Oxide.	3.6 mm 1.5 V Alkaline or Silver Oxide.
10 mm Diameter × Thickness:
2.5 mm 3 V Lithium.
11.5 mm Diameter × Thickness:
3 mm 3 V Lithium.
11.6 mm Diameter × Thickness:
1.6 mm 1.5 V Alkaline or Silver Oxide.	2.1 mm 1.5 V Alkaline or Silver Oxide.	3.1 mm 1.5 V Alkaline or Silver Oxide.	3.3 mm 1.5 V Alkaline or Silver Oxide.	3.6 mm 1.5 V Alkaline or Silver Oxide.	4.2 mm 1.5 V Alkaline or Silver Oxide.	5.4 mm 1.5 V Alkaline or Silver Oxide. 1.35 V Zinc Air.
12 mm Diameter × Thickness:
1.6 mm 3 V Lithium.	2 mm 3 V Lithium.	2.5 mm 3 V Lithium.	4 mm 3 V Lithium.
15.5 mm Diameter × Thickness:
5.4 mm 1.5 V Silver Oxide.
15.7 mm Diameter × Thickness:
6 mm 3 V Lithium.
16 mm Diameter × Thickness:
1.2 mm 3 V Lithium.	1.68 mm 3 V Lithium.	2 mm 3 V Lithium.	3.2 mm 3 V Lithium.
20 mm Diameter × Thickness:
1.2 mm 3 V Lithium.	1.6 mm 3 V Lithium.	2 mm 3 V Lithium.	2.3 mm 3 V Lithium.	2.5 mm 3 V Lithium.	3.2 mm 3 V Lithium.	20 × 4 3 V Lithium.
23 mm Diameter × Thickness:
2 mm 3 V Lithium.	2.5 mm 3 V Lithium.	3 mm 3 V Lithium.	3.5 mm 3 V Lithium.	5.4 mm 3 V Lithium.
23.2 mm Diameter × Thickness:
6.1 1.5 V Alkaline or Silver Oxide.
24.5 mm Diameter × Thickness:
1.2 mm 3 V Lithium.	3 mm 3 V Lithium.	5 mm 3 V Lithium.	7.7 mm 3 V Lithium.
30 mm Diameter × Thickness:
3.2 mm 3 V Lithium.

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