Battery compatibility reference
Exact specs, substitution rules, and plain-English guidance for every common consumer battery type. Use the table below to jump straight to a type, or browse by category.
Quick reference
| Type | Common sizes | Typical use |
|---|---|---|
| AA | 14.5 × 50.5 mm | Remotes, toys, flashlights |
| AAA | 10.5 × 44.5 mm | Slim remotes, small devices |
| 9V | 26.5 × 17.5 × 48.5 mm | Smoke detectors, multimeters |
| C | 26.2 × 50 mm | Lanterns, toys, radios |
| D | 34.2 × 61.5 mm | High-drain flashlights, boomboxes |
| CR2032 | 20 × 3.2 mm | Key fobs, coin cell devices |
| CR2025 | 20 × 2.5 mm | Watches, small remotes |
| LR44 | 11.6 × 5.4 mm | Calculators, medical devices |
| Size 312 | 7.9 × 3.6 mm, brown | BTE/RIC hearing aids |
| Size 13 | 7.9 × 5.4 mm, orange | BTE power hearing aids |
Browse by category
Coin cell batteries
Lithium and alkaline button cells — CR, LR, and SR chemistry. Match diameter and height exactly; never substitute a thicker cell.
Alkaline cylindrical
AA, AAA, C, D, and 9V — the standard household sizes. Grouped by IEC designation with dimension tables and substitution notes.
Hearing aid batteries
Zinc-air button cells identified by color-coded tab. The tab seals the air holes — remove it just before use, not in advance.
Comparisons
Side-by-side specs when cells look similar and you need to know if they're interchangeable.
Tools & cheat sheets
Not sure what code is on your battery? Use the Battery Code Lookup tool to search by any alias or alternate code, or grab the coin cell equivalents cheat sheet for a printable cross-reference.