Understanding battery sizes ensures you choose the correct replacement for your devices. This comprehensive guide covers standard battery sizes from AAA to D, button cells, 9V batteries, and rechargeable options.
| Size | Diameter | Height | Voltage | Capacity (Alkaline) | Common Uses |
|---|---|---|---|---|---|
| AAA | 10.5mm (0.41") | 44.5mm (1.75") | 1.5V | 1000-1200 mAh | Remotes, small electronics |
| AA | 14.5mm (0.57") | 50.5mm (1.99") | 1.5V | 2400-3000 mAh | Flashlights, toys, controllers |
| C | 26.2mm (1.03") | 50mm (1.97") | 1.5V | 7500-8000 mAh | Flashlights, portable radios |
| D | 34.2mm (1.35") | 61.5mm (2.42") | 1.5V | 15000-20000 mAh | Large flashlights, boomboxes |
| 9V | 26.5mm (1.04") | 48.5mm (1.91") | 9V | 500-600 mAh | Smoke detectors, multimeters |
| Type | Diameter | Height | Voltage | Common Uses |
|---|---|---|---|---|
| CR2032 | 20mm | 3.2mm | 3V | Key fobs, watches, motherboards |
| CR2025 | 20mm | 2.5mm | 3V | Watches, calculators |
| CR2016 | 20mm | 1.6mm | 3V | Watches, small remotes |
| LR44 (AG13) | 11.6mm | 5.4mm | 1.5V | Laser pointers, toys |
| CR1632 | 16mm | 3.2mm | 3V | Car key fobs |
| Size | Voltage | Typical Capacity | Replaces | Recharge Cycles |
|---|---|---|---|---|
| AAA | 1.2V | 800-1000 mAh | 1.5V AAA | 500-1000 |
| AA | 1.2V | 2000-2800 mAh | 1.5V AA | 500-1000 |
| C | 1.2V | 4500-6000 mAh | 1.5V C | 500-1000 |
| D | 1.2V | 9000-12000 mAh | 1.5V D | 500-1000 |
| 9V | 8.4V | 200-300 mAh | 9V alkaline | 500-1000 |
Alkaline batteries: Higher initial voltage (1.5V), longer shelf life (5-10 years), single-use, cost-effective for low-drain devices. Rechargeable NiMH: Lower voltage (1.2V), 500-1000 recharge cycles, cost-effective for high-drain devices, better for environment.
Alkaline: Most common, good all-around performance. Lithium: Lightweight, extreme temperature performance, 10+ year shelf life. NiMH: Rechargeable, environmentally friendly. Zinc Carbon: Budget option, low power applications only.
Store batteries in cool, dry place (room temperature). Never mix old and new batteries. Remove batteries from devices not used for months. Dispose properly at recycling centers—never throw in regular trash. Keep button batteries away from children (choking/ingestion hazard).