Find the right battery, cable or replacement
A reference index for the parts people mix up. Battery codes cross-referenced across manufacturer aliases, and plain answers on the cable standards that sound interchangeable and are not.
Batteries
Which cell fits, which one lasts longer, and when one can safely replace the other.
Coin cells
Household sizes
Lithium & rechargeable
Chemistry
- Alkaline vs lithium batteries
- NiMH vs alkaline batteries
- Alkaline vs rechargeable batteries
- Lithium vs rechargeable batteries
- NiMH vs lithium-ion batteries
- NiCd vs NiMH batteries
- LiFePO4 vs lithium-ion batteries
- LiPo vs lithium-ion batteries
- AGM vs lead-acid batteries
- Gel vs AGM batteries
- AGM vs lithium batteries
Cables
Which standard does what, which plug fits which port, and where the version number on the box does not mean what it looks like.
Audio return
USB & Thunderbolt
Popular batteries
Most-looked-up cells this week.
Browse by battery type
Start from the shape you are holding.
Small round cells, 1.5 V typical, for watches and calculators.
Flat 3 V lithium cells named for their exact dimensions.
Household and rechargeable cells such as AA, AAA and 18650.
Multi-cell alkaline packs such as the 12 V A23.
Size chart
Code, voltage and dimensions at a glance.
| Code | Type | Voltage | Ø mm | H mm | Chemistry |
|---|---|---|---|---|---|
| LR44 | Button Cell | 1.50 | 11.6 | 5.4 | Alkaline |
| SR44 | Button Cell | 1.55 | 11.6 | 5.4 | Silver Oxide |
| CR2032 | Coin Cell | 3.00 | 20.0 | 3.2 | Lithium |
| CR2025 | Coin Cell | 3.00 | 20.0 | 2.5 | Lithium |
| CR2450 | Coin Cell | 3.00 | 24.5 | 5.0 | Lithium |
| AA | Cylindrical | 1.50 | 14.5 | 50.5 | Alkaline |
How it works
- 1Find your battery
Search a part number, an alias, or the size printed on the cell you are replacing.
- 2Read the comparison
Voltage, chemistry and dimensions side by side, with a plain verdict on whether one replaces the other.
- 3Confirm before you buy
Check the warnings and your device manual. A cell that fits is not always a cell that is safe.