Common primary and rechargeable cylindrical cells used in portable electronics, sensors, controllers, and consumer devices. Capacity depends strongly on chemistry, discharge current, and operating temperature.
| Format | Dimensions | Nominal Voltage | Typical Capacity |
|---|---|---|---|
| AA / LR6 | Ø14.5 × 50.5 mm | 1.5 V alkaline / 1.2 V NiMH | ≈ 1,800–2,800 mAh |
| AAA / LR03 | Ø10.5 × 44.5 mm | 1.5 V alkaline / 1.2 V NiMH | ≈ 600–1,200 mAh |
Design note: Capacity depends on discharge rate, cutoff voltage, temperature, age, and chemistry. Confirm the manufacturer datasheet, charging method, protection requirements, and allowable current before designing a product.
The 18650 is a widely used rechargeable lithium-ion format. Protection circuits, button tops, and manufacturer construction can slightly change the overall length and usable capacity.
| Format | Dimensions | Nominal Voltage | Typical Capacity |
|---|---|---|---|
| 18650 flat-top | Ø18 × 65 mm nominal | 3.6–3.7 V nominal; 4.2 V full | ≈ 2,000–3,500 mAh |
| 18650 protected | Ø18–19 × 67–70 mm | 3.6–3.7 V nominal; 4.2 V full | ≈ 2,000–3,400 mAh |
Design note: Capacity depends on discharge rate, cutoff voltage, temperature, age, and chemistry. Confirm the manufacturer datasheet, charging method, protection requirements, and allowable current before designing a product.
A compact non-rechargeable lithium coin cell commonly used in real-time clocks, memory backup, calculators, key fobs, and low-power sensors.
| Format | Dimensions | Nominal Voltage | Typical Capacity |
|---|---|---|---|
| CR2032 | Ø20 × 3.2 mm | 3.0 V nominal | ≈ 210–240 mAh |
| CR2025 | Ø20 × 2.5 mm | 3.0 V nominal | ≈ 150–170 mAh |
| CR2016 | Ø20 × 1.6 mm | 3.0 V nominal | ≈ 80–100 mAh |
Design note: Capacity depends on discharge rate, cutoff voltage, temperature, age, and chemistry. Confirm the manufacturer datasheet, charging method, protection requirements, and allowable current before designing a product.